The performance of 18 tube lenses compared with the Mitutoyo 5x M Plan APO infinity-corrected objective has just been uploaded. This was a huge project that revealed some big surprises.
Check it out here on Closeuphotography.com:
https://www.closeuphotography.com/tube-lens-test
Lenses compared:
Thorlabs ITL200 Tube Lens
Mitutoyo MT-1 Tube lens
Nikon MXA20696 Tube Lens
Reichert Microscope Tube Lens
Canon 250D Close-up Lens
Century Precision Optics +4 Achromatic Diopter Lens
Century Precision Optics +7 Achromatic Diopter Lens
Cosina MMA Matched Macro Adapter Lens
Raynox +4.8 diopter (43mm x 0.5 mount)
Raynox +5.9 diopter (37mm x 0.5 mount)
Raynox +8 diopter (43mm x 0.5 mount)
Sigma LSA Life Size Attachment Lens
Asahi Pentax Tele-Takumar 200mm f/5.6 Lens
Carl Zeiss Tele-Tessar T* 200mm f/3.5 Lens
Nikkor 135mm f/3.5 Ai Lens
Nikkor 200mm f/4 Ai Lens
Sigma 150mm F2.8 EX DG OS HSM APO Macro Lens
Voigtlander APO-Lanthar 125mm f/2.5 Macro Lens