The Componon 4/28 (CPN 4/28) is popular high-performance macro lens made by the Jos. Schneider Optische Werke Kreuznach in Bad Kreuznach, Germany. The CPN 4/28 is one of my favorites, I probably own half a dozen different versions of this lens. The 4/28 design which started out as a photographic enlarger lens has been successfully sold by Schneider since the 1960s, and the latest model sold today for use in industrial machine vision applications, uses the same optical design.
The Componon 28 is a good choice for photomacrography with very good sharpness, good coverage, when setup in a stacked configuration, and usually available on the used market at a low prices. The compact size makes these easy to mount and work with, and all of the types are very well made, and all are consistently good performers when setup correctly.
All of the lenses in this post were purchased without any discount or commission from anyone. Also it’s important to know that this post which does not contain any affiliate links, ads or visitor tracking as there are on commercial for-profit lens review sites.
Schneider Componon 4/28 preset Cylinder housing, CPN 4/28 with 5 blade iris, 2.8/28 Makro Iris, CPN 4/28 chrome with 15 blade iris, and Black chrome CPN 4/28 with 15 blade iris. I included the 2.8/28 CPN here for the simple fact that its not an f/4, but it does use the same optical design as the 4/28 CPN.
Quick Review
What I like about the lens
-Sharpness
-Small compact size
-Excellent performance value
-Availability on the used market
-Consistent performance over the years
-Superb image quality from 2x to 4x in a stacked setup
Things that I dislike about the lens
-The aperture ring on the 4/28 protrudes farther than the filter mount, so step-up ring mounted on the filter threads will bind on the aperture ring, causing the aperture to change as you tighten the adapter. The CPN 2.8/28 does not have this flaw, it features a separate, proper, lockable aperture ring.
Things I am disappointed with
-Unattractive 5-blade iris design
Things I don't need
-Lens cells on the 4/28, and almost all Schneider lenses, are only hand-tight so they can tend to loosen as time goes on. The 2.8/28 uses a thread locking compound and a lock ring on the rear cell (with a shim).
-Odd-ball thread sizes that Schneider likes to use, like 30,5mm.
This is the latest model, and the most common CPN28 that turns up on the used market. This CPN28, seen above with a plastic ( ! ) box, was still being sold by Schneider Optics USA in 2017, when I started writing this page in 2017. I am not sure if this CPN28 type, called the B-00 iris mount, is still being sold new but there are lots of these out there on the used market.
Schneider Componon 28mm f/2
The Componon 4/28 is easy to upgrade with various iris mounts for a maximum aperture of to f/2. Below is an example of an f/4 Componon upgraded with a BK#00 f/2 iris housing from a Xenon 2/50 (which was a dud lens by the way)
Schneider Componon 4/28 in an upgraded f/2 BK#00 iris mount on the left, and the standard f/4 BK#00 iris mount on the right.
Componon 28 performance
The CPN 4/28 and 2.8/28 perform best in stacked configuration from 2x to 4x with a large enough image circle to cover a full frame sensor. Stacking lenses, also called coupling lenses, is a technique to increase magnification where you mount a longer focal length lens on the camera and a second shorter focal length in reverse and face-to-face on the rear lens which is set to infinity focus. Together the combination has the potential to resolve more than either of the lenses setup for close-focus with extension.
Schneider Componon 4/28, left, and Canon MP-E 65 1-5x macro lens on the right.
3.5x Test: Schneider Componon 4/28 Vs Canon MP-E 65 Macro Lens
The Canon MP-E 65 was tested at f/3.5, the sharpest aperture at this magnification. The Schneider Componon 4/28 lens was shot wide-open and stacked on a Schneider Componon 5.6/100 lens, not the best tube lens available by any measure, but they are can be purchased for almost nothing on eBay, I paid $25 for the unit in this test. The performance will be at least one grade mark higher, especially in the corners, with high-performance tube lens.
3.5x SETUP INFORMATION
Schneider Componon 4/28 setup
Front lens: Schneider Componon 4/28 lens reverse mounted
Rear lens: Schneider Componon 5.6/100 lens normally mounted focused at infinity
Stacked lens nominal test aperture: f/4
Stacked lens effective test aperture: f/14
Canon MP-E 65mm f/2.8 1-5x macro lens setup
MPE nominal test aperture: f/3.5
MPE effective aperture for this test: f/15.75
Camera: Sony α6300, model # ILCE-6300, also known as: A6300
Sensor size: APS-C 23.5 × 15.6 mm. 28.21 mm diagonal. 3.92 micron sensor pitch
Flash: Godox TT350s wireless flash x 2 with one Godox X1s 2.4G wireless flash transmitter
Vertical stand: Nikon MM-11 with a Nikon focus block
For this test a stack of images was made with 2 micron steps, and was repeated for each aperture. The sharpest frame was then chosen using Photoshop at 100% actual pixel view. Separate images were selected for center, edge, and corner if needed. Each image was processed in PS CC with identical settings with all noise reduction and lens correction turned off, all settings were zeroed out (true zero) and the same settings were used for all of the images.
2500 PIXEL IMAGE SAMPLE
Click on the image below to view a larger version in a Lightbox viewer. The size of the image sent to your device is based on the screen size. To see an image in a new browser tab, right click, or two-finger press, and select Open in a New Tab or New Window from the menu. The full size image will be 2500px across and have 2500w at the end of the image URL. If the image size is anything smaller you can easily change the number to 2500 manually and press enter to bring up the largest image. You can also right click, or two-finger press, and select Save Image As to save the image.
Canon MP-E 65mm f/2.8 1-5x macro lens at 3.5x
The Canon image looks sharp and detailed from center to the edges, until you compare the Componon image below. The Schneider lens has is much sharper and more detailed. Both images were processed with identical settings in Photoshop.
Schneider Componon 4/28 lens reverse mounted on the Schneider Componon 5.6/100 lens normally mounted focused at infinity, both lenses wide open.
100% View Crops
Click on the image below to view a larger version in a Lightbox viewer. To see an image in a new browser tab, right click, or two-finger press, and select Open in a New Tab or New Window from the menu. You can also right click, or two-finger press, and select Save Image As to save the image.
100% view center crop Canon MP-E 65mm f/2.8 1-5x macro lens at 3.5x
100% view center crop Schneider Componon 4/28 lens reverse mounted on the Schneider Componon 5.6/100 lens
Wide-open at 3.5x the center sharpness of the Componon 4/28 is excellent. The Componon crop on the left, has much more detail, without the chromatic aberrations of the MP-E 65 on the left. The Canon crops look out of focus compared to the CPN 4/28.
100% view corner crop Canon MP-E 65mm f/2.8 1-5x macro lens at 3.5x
100% view corner crop Schneider Componon 4/28 lens reverse mounted on the Schneider Componon 5.6/100 lens
These images made at 3.5x are sharper and cleaner than the Canon MP-E 65. The CPN 4/28 is excellent in the 2x - 5x magnification range when setup properly.
What does this level of performance cost? The Canon MP-E 65 is about $600-700 used to $1,000 new. The Componon 4/28 and 5.6/100 lens pair on eBay would cost about $100 to maybe $200 USD total on the high-end, plus a few dollars for adapters. The performance from the pair of Componon lenses is excellent for the price, and would be hard to beat. A microscope objective at the same cost could match the sharpness, but with a smaller image circle, and with more chromatic aberrations. With a better corrected tube lens, the performance out of the 4/28 increases quite a bit, especially in the corners.
For more tests featuring the Schneider CPN 28 in a stacked configuration on Closeuphotography.com, see the following links:
The CPN 4/28 image quality compared to the Mitutoyo M Plan APO 5x objective: https://www.closeuphotography.com/50-dollar-componon-vs-mitutoyo-objective
The CPN 2.8/28 lens at 3.2x and at 4.3x: https://www.closeuphotography.com/schneider-kreuznach-28mm-f2-8-componon-lens
The CPN 2.8/28 compared against the Mitutoyo M Plan APO 5x objective: https://www.closeuphotography.com/makro-symmar-120-and-componon-28-lens-stack
When this lens is reverse mounted and used focused with extension from 2x to 4x, the useful image circle is too small to cover a APS-C sensor with sharp corners, even stopped down to f/4.5. To see examples of the performance of the CPN 4/28 at 4x on extension only, follow this link: https://www.closeuphotography.com/4x-lens-test-part-3.
5.4x image sample
The image below is 2500 pixels wide. Click on the image below to view a larger version in a Lightbox viewer. The size of the image sent to your device is based on the screen size. To see an image in a new browser tab, right click, or two-finger press, and select Open in a New Tab or New Window from the menu. The full size image will be 2500px across and have 2500w at the end of the image URL. If the image size is anything smaller you can easily change the number to 2500 manually and press enter to bring up the largest image. You can also right click, or two-finger press, and select Save Image As to save the image.
Schneider CPN 28 stacked with CPN-S 150 tube lens at 5.3x.
At 5.3x; sharp, lots of detail, clean colors, and zero drop off in quality from center to the far corners. CPN28 at f/2.8 with CPN-S 150mm tube lens at f/5.6.
componon 28 Iris types
The three Componon 28 iris types; 15-blade iris at f/4, 5-blade iris at f/4 and Makro-Iris 5-blade iris at f/2.8.
The easiest way to tell the Componon 28 types apart is by looking at the iris. You can see the three types in the image above, the 15 blade at f/4 on the left, the 5 blade at f/4 in the center, and 5 blade Makro-iris at f2.8 on the right. I prefer the look of the more circular 15-blade iris, but the Makro-Iris type is easier to use and is lockable with a set-screw.
The Componon 28 with an F/2 aperture?
Componon 4/28 with modified iris
It is possible to find CPN 4/28 lenses that will actually open past f/4. In the image above you can see a modified CPN 4/28 on the left, set fully open compared to a normal CPN 4/28, set to f/4, on the right. The modification is done by removing the front lens cell, removing a couple of fasteners and re-setting the aperture tab to allow for the aperture to open fully. With the modified iris you will lose the ability to set f/11 and f/16. The modification, when done correctly is not permanent. Email me for more details if you are interested in finding out more about this modification.
January 2020 Update note: new information has been added below for a description of a #00 barrel housing swap for gaining a larger maximum aperture of up to f/1.9!
quick specs for the most common 4/28 and 2.8/28 iris mount barrel types
Schneider Componon 28mm Chrome barrel
Schneider Componon 28mm f/4 Chrome Barrel
Chrome barrel with 15 blade iris look great but the coatings aren’t as good as the later lenses.
Filter threads: 30.5mm x 0.5
Mount: 25mm x 0.5mm
Iris: 15 blades
Note: This lens was listed in the Schneider lens catalog from 1963, the serial number dates this lens to 1967.
Schneider Componon 28mm black chrome barrel with a 15 blade iris.
Schneider Componon 28mm f/4 Black Chrome Metal Barrel
Black chrome barrel with 15 blade iris
Filter threads: 30.5mm x 0.5
Mount: 25mm x 0.5mm
Iris: 15 blades
Note: This is one of the harder types to find. The serial number dates this lens to 1969.
Schneider Componon 28mm f/4 Black Large Metal Barrel
Large metal barrel with 5 blade iris and split circle aperture indicator
Filter threads: 40.5mm x 0.5mm
Iris: 5 blade
Mount: 39mm x 26 TPI ( turns-per-inch or threads-per-inch, approximately 0.977mm pitch)
Note: This is the pre-plastic large metal barrel with 5 blade iris and the split image circle on the side of the barrel
Schneider Kreuznach 28mm f/4 Componon B00 barrel type
Schneider Componon 28mm f/4 Compact Black Metal Barrel Type B00
Small compact metal barrel with 5 blade iris and split circle aperture indicator
Schneider Optics part number: 10-010340
Also known as:
COMPONON 28/4.0 BARREL #00
Componon 4,0/28
Componon 4,0/28 NORMAL
Filter threads: 30.5mm x 0.5
Mount: 25mm x 0.5mm
Iris: 5 blade
Note: This lens was still available new at Schneider Optics USA in late 2017 for $523.
Schneider Componon 28mm enlarger lens with BKV-L barrel
Schneider Componon 28mm f/4 Black Plastic Barrel Type BKV-L
Plastic enlarger lens style body with green window
Schneider Optics USA part number: 10-037275
Also known as:
COMPONON 28/4.0 LEICA
Componon 4,0/28
COMPONON 28/4.0 BARREL BV-L
Filter threads: 43mm x 0.75mm
Iris: 5 blade
Mount: 39mm x 26 TPI ( turns-per-inch or threads-per-inch, approximately 0.977mm pitch)
Notes: Looks like there are at least two type of this model, with slightly different cosmetic differences to the front and rear cells, one is slightly larger at the front, 15mm vs 16mm diameter.
Schneider Kreuznach 28mm f/2.8 Componon in industrial B-V barrel
Schneider Componon 28mm f/2.8 Machine Vision Lens Barrel Type B-V
Latest all-metal machine vision industrial model with 5 blade iris
Schneider Optics part number: 25-014794
Also known as:
Componon 2.8/28 Machine Vision Lens
28mm f/2.8 Componon Makro Iris
MACRO COMPONON 2.8/28MM
Componon 2.8/28-0001 Macro lens
Filter threads: M37 x 0.75.
Iris: 5 blade
Mount: V38 standard Industrial V-mount on the front and rear allows easy reverse mounting.
Current Retail Price: $895. USD new from Schneider Optics or Edmunds.
Note: This is the latest version and worth the extra cost, this lens also sold in a cylinder body without an iris.
Schneider Componon 4/28 Compur
Schneider Componon 28mm f/4 Compur
Filter threads: M30.5 x 0.5
Iris: 5 blade Compur shutter #00
Mount: M25.0 x 0.5mm Standard Compur shutter #00
Notes: This is the first example of this type that I’ve ever seen, the Componon 4/28 Compur, and was sold as new-old-stock still in the box. The seller bought it from the original owner, a camera shop that had been in business for 60 years that had purchased it new in the 70’s. This is a normal CPN 4/28 mounted in a #00 Compur shutter. Why they would mount this lens in a shutter is a little strange since the image circle of this lens normally mounted, not reversed, is about half of the coverage needed to cover the 35mm film format.
Schneider Componon 4/28 Compur
Schneider Componon 4/28 Compur
Since this lens is not of any use to me or anyone else mounted in a mechanical shutter, I would need to remount the lens cells in an appropriate barrel. Thankfully this is a really easy operation and I just happened to have a perfect Schneider #00 iris mount on hand in the form of a Componon 4/50 lens. The #00 barrel and #00 shutter have the same threads, M22.9 x 0.5mm, and DIMs so it only takes a few minutes to swap out.
Componon 4/28 threaded barrel mount type
Schneider Componon 4/28 in a threaded barrel mount
Schneider Componon 28mm f/4 Threaded Barrel Mount
Filter threads: 30.5mm x 0.5
Mounting threads: 30.5mm x 0.5
Iris: f/3.7 Waterhouse stop
Notes: This is the Componon 4/28 in an industrial threaded barrel mount with a preset aperture. The f-stop has a nominal f/4 on the front of the lens but actually the lens measures out at f/3.7 forwards, and f/3.5 in reverse! The type tends to be scarce but they do turn up from time to time on the used market more than the shutter mount type above at least. These types of lenses were used in all kinds of industrial applications and even in mini-lab printing machines. The front threads and mounting threads are the normal 30.5mm x 0.5 size. The lens cells are either extremely tight or not designed to be removed from the threaded barrel.
Componon 4/28 cylinder mount XL size
Schneider Componon 28mm f/4 XL Cylinder Mount
Filter threads: none
Mounting threads: none
OD: 34.5mm Length: 34.5mm
Iris: f/3.7 Waterhouse stop
Notes: This is the only copy of this type of CPN 4/28 that I’ve ever seen. There are no filter threads and no mounting threads. Lens is marked f/4 but it measures f/3.7. Looks like this type of 4/28 does not use lens cells, instead the elements mounted inside the body with retaining rings.
f/2 iris mount upgrade for the Componon 4/28
Schneider Componon 4/28 iris mount replacement
The Schneider B-00 iris mounts from the CPN 4/50 and the CPN 4/28 have the same dimensions and threads, but the apertures are set to open to different diameter apertures, even though they are both labeled with a nominal f/4. The 4/50 set wide open at f/4 results in an aperture of about 12.5mm, while the CPN 4/28 iris opens to only 6mm at f/4. This is because 50/12.5 = 4, while 28/6 = 4.6. So the trick is when you place the 4/28 lens cells in the 4/50 iris housing, the 4/28 now has a 12.5mm aperture when set wide open. 28/12.5 = 2.24. The CPN 4/28 lens cells mounted in a CPN 4/50 iris housing will allow an aperture of f/2 wide open, normally mounted, and f/2.2 wide open in reverse, when measured with both lens cells in place.
Schneider Componon 4/28 normal maximum aperture on the left and upgraded iris mount on the right
The upgraded iris works perfectly with half and full click stops from f/2 to f/16, although the aperture ring only shows f/4 as the maximum.
F/1.9 iris mount upgrade for the 15-blade iris lens!
Schneider Componon 4/35 at the maximum aperture of f/4 on the left, and upgraded iris mount on the right, open to f/1.9.
It is possible to upgrade the older chrome and black chrome 15-blade lenses with a larger maximum aperture. There are two ways to accomplish this I have found. Upgrade the iris mount to a wider opening unit, or modify the unit you have to open wider. Swapping out iris mounts is a lot easier but in the end both methods work perfectly. I have not changed housings on the older 4/28 15-blade lens but I have upgraded the 4/35 a couple of times and it works perfectly.
For this example here I used a donor iris mount from a old 15-blade 5.6/80 Componon. Here is the normal black chrome CPN 4/35 on the left at the maximum f/4, and on the right is the Componon 4/35 in a 5.6/80 CPN housing, which opens up to f/1.9 forward and a fantastic f/2.4 in reverse!
You can modify the 15-blade iris mount to open wider by disassembling the lens and removing the pin that limits travel of the iris actuation tab. Email me for more details if you are interested.
quick look at the BK-VL Iris Mounts
So far we know that it is possible to upgrade the Schneider 4/28 in the older iris mount types to a faster iris mount that allows a maximum f/2 wide open, that is a gain of 2 full stops. What about the later large size iris mounts, the BK-VL? Since I just happened to have a couple of spare BK-VL iris mounts, let’s take a look.
For this upgrade I removed the lens cells from a normal BK-VL iris mount, here on the left, and moved them into a BK-VL mount from a Comparon-S 2.8/50 lens, as you can see below on the right. I just happened to have the Comparon-S lens on hand and I didn’t hesitate to remove the lens cells to use the iris housing since the lens was a really poor performer. The iris housing from a 2.8/50 Componon-S would work just as well.
Schneider 4/28 BK-VL iris mount upgrade, standard f/4 barrel wide open on the left, and the upgraded iris mount on the right wide open at f/2.
Above you can see the standard iris mount wide open at f/4 on the left above, and the upgraded mount wide open at f/2 on the right. The upgraded iris housing at f/2 is a full two stops faster than the standard iris mount.
On the left below is the older all-metal large size BK-VL type mount with the aperture printed on the ring. This one uses 22mm front and 22mm rear cells, threads measure M22.9 x 0.5. The newer style BK-VL mounts with the green and yellow aperture window use larger 27mm front and 22mm rear cells (threads measure 22.9 x 0.5x). This means that it’s easy to swap cells from the green window 4/28 to the yellow window f/2.8 mount, or green window 2.8/50 if you have that, to gain a faster maximum aperture. The older all-metal large size BK-VL type mount would not accept the newer 27mm front cells, but the older BK#00 cells are no problem. This information certainly opens up some possibilities.
The B-V, Makro-Iris, and Preset Mounts are compatible with the CPN 4/28 threads and allow for an f/2 maximum aperture.
The original lens cells found on the Preset, BKV-L, and B-V iris mounts included a shim on the rear cell. I tested the CPN 4/28 with these iris mounts, without a shim, and didn’t see any sharpness problems or issues with CAs. Be aware that most of the B-V mount lenses I own use tread-locking compound on the cells, except for a CPN-S 2.8/50 that I used to test. Also the measurements above are rounded off, the actual thread sizes are 22.9 x 0.5mm and approximately 27.5 x 0.5mm (28 OD and 27 ID).
Schneider lens data from the manufacturer
Jos. Schneider Optische Werke headquarters closed the Schneider Optics USA website in 2017 so some of these documents are no longer available online.
Links for more info on the Schneider Componon 4/28 and 2.8/28
Official lens data for the Componon 4/28 on the Schneider site:
https://schneiderkreuznach.com/download_file/force/426/1085
Official lens data for the Componon 2.8/28 lens on the Schneider site:
https://schneiderkreuznach.com/download_file/force/440/1085
Test of the Componon 4/28 on the Coinimaging.com site:
http://coinimaging.com/schn_28r.html
www.photomacrography.net Componon 4/28 discussion:
https://www.photomacrography.net/forum/
Another discussion on the Componon 4/28 at PM.net:
https://www.photomacrography.net/forum/
OTHER LENSES in the 28mm range THAT YOU SHOULD KNOW ABOUT
Minolta 30mm Rokkor CE: Not recommended due to excessive lateral chromatic aberration problems and expensive. M39 x 26 tpi, Leica thread mount. No filter threads.
Minolta E. Rokkor 30mm F4.5 enlarger lens: Not recommended.
M39 x 26 tpi, Leica thread mount. No filter threads. Chromatic aberration problems.
Rodenstock Omegaron 25mm f/4 enlarging lens: recommended.
M32.5mm x 0.5mm mount. Sleeper lens. Low cost and decent quality. No filter threads.
Rodenstock Linos Rodagon 28mm f4: Good but the image quality is not at the same level as the CPN 4/28. M32.5 x 0.5 mount, M30.5 x 0.5 filter threads
https://www.closeuphotography.com/rodagon-28mm-lens-test
Rodenstock Linos Rodagon 28mm f2.8: Latest version of the Rodagon 28mm and a replacement for the Rodenstock Linos Rodagon 28mm f4.
Schneider M-Componon 4/28 Macro Lens: Highly recommended.44mm V-mount, M29.5-0.5 threaded adapter for Copal #0 shutter mount most common. Great image quality and coverage. Perfect APS-C coverage. https://www.closeuphotography.com/schneider-kreuznach-28mm-f4-m-componon
Schneider Xenon 2/28 printing machine lens: Highly recommended.25mm mount. Good APS-C coverage. Amazing image quality but a little hard to find on the used market. https://www.closeuphotography.com/schneider-kreuznach-xenon-28mm-f2-lens
Schneider Xenoplan 2/28 machine vision lens: Recommended.C mount is most common. Poor APS-C coverage. Amazing center sharpness. Very recommended for smaller sensors.
Voss 25mm f/3.5 enlarging lens: Not recommended. M39 x 26 tpi enlarger mount. Soft with poor corners at f/4-5.6. Very soft at f/3.5.
Schneider Enlarger lens List
Componon lens lineup
6-element, 4-group design
The Componon is the high-quality enlarging lens line. Some models have been superseded by units the Componon-S line. Some of these models have older coatings that results in less contrast than you would see from newer models.
・16mm F2.8 (cylinder mount)
・25mm F4 (cylinder mount)
・28mm F4 (for 18×24 mm)
・35mm F4 (for 126 film)
・40mm F4 (for 24x24 mm)
・50mm F4 (for 24x36 mm)
・60mm F5.6 (for 4×4 cm)
・80mm F5.6 (for 6×6 cm)
・100mm F5.6 (for 6×7 cm)
・105mm F5.6 (for 6×9 cm)
・135mm F5.6 (for 4×5 in)
・150mm F5.6 (for 4×5 in)
・180mm F5.6 (for 5×7 in)
・210mm F5.6 (for 5×7 in)
・240mm F5.6 (for 8×10 in)
・300mm F5.6 (for 24×30 cm)
・360mm F5.6 (for 30×40 cm)
Componon-S lineup
6-element, 4-group design
Some of these units are updated versions of lenses in the Componon line. They are corrected for flatness of field, contrast, and color rendition. The CPN-S lenses are very good and also make excellent tube lenses.
・50mm F2.8 (for 35 mm)
・80mm F4 (for 6×6 cm)
・80mm F5.6
・100mm F5.6 (for 6×9 cm)
・105mm F5.6
・135mm F5.6 (for 4×5 in)
・150mm F5.6 (for 4×5 in)
・180mm F5.6 (for 5×7 in)
・210mm F5.6 (for 5×7 in)
・240mm F5.6 (for 8×10 in)
・300mm F5.6 (for 24×30 cm)
・360mm F6.8 (for 10x12 in)
WA-Componon lenses
6-element, 3-group design.
Personally I stay away from WA-Componon lenses since I have seen centering issues with the two samples I’ve tested.
・40mm F4 (for 35 mm)
・60mm F5.6 (for 6×6 cm)
・80mm F5.6 (for 6×9 cm)
G-Componon lenses
6-element, 4-group design.
Uncommon on the used market, designed for extra-large sized printing.
・100mm F5.6 (for 6×9 cm)
・150mm F5.6 (for 4×5 in)
・210mm F5.6 (for 5×7 in)
・240mm F5.6
・300mm F5.6 (for 8×10 in)
・360mm F6.8
・480mm F9.4 (for 24×30 cm)
APO-Componon HM lineup
6-element, 4-group optical design.
Schneider gives the lenses in this line the Apochromatic label but in my experience, few of the APO-Componons designs are actually apochromats, the 120mm and 150mm are excellent. Designed for use wide-open but this is not something I would recommend on the 40 and 45mm, these are definitely not apochromats.
・40mm F2.8
・45mm F4
・60mm F4
・90mm F4.5
・120mm F5.6
・150mm F4
JANUARY 25TH 2020 Update:
Added quick review of two Componon 4/28 types not see very often.
The Componon f/1.9 Iris Mount upgrade!
January 28th, 2020 update:
Componon 4/28 BK-VL Iris Mount upgrade information for an f/2 maximum aperture.
January 29th, 2020 update:
Added information and an image of the Componon 4/28 upgraded with a BK #00 f/2 iris mount.
January 30th, 2020 update:
B-V Iris mount and Preset mount information added.