I have collected and tried almost all of the Pentax auto 110 gear that I am aware of -- 18mm f/2.8 wide, 18mm f/2.8 pano, 24mm f/2.8, 20-40mm f/2.8, 50mm f/2.8, 70mm f/2.8, Soligor 1.7x TC.
Pentax Auto 110 24mm f/2.8 on top of the Sony NEX 18-55 kit lens. Filter size on the 24mm is 25.5mm
Pentax Auto 110 24mm f/2.8 mounted on NEX 5N.
Original Pentax Auto 110 body on back, aperture opening is closer to a square and with round corners.
These tiny lenses don't have any aperture blades and the mechanics stay in the Pentax Auto 110 body. The opening in the body is not circular in shape. I do find adapter bearing the brand of RJ on the M43 that have aperture adjustment. And it was the same vendor that I bought two iris in 20mm and 30mm outside diameter but I fail to get the aperture blades to work on my Sony with APS-C sensor as vignette happens quite severely.
the very round aperture blades with 30mm outside diameter that I kept as a souvenir. The 20mm OD is the one that fits the more expensive but better built Kipon adapter on the NEX.
When I use the auto 110 with aps-c, the lens shoot wide open. Vignette does happen but some are more severe than others. These Pentax auto 110 lens can't be used as normal lens on the aps-c, but they can bring in film characters of their own. Color, contrast, corner sharpness are not something that one can depend on. I usually use them for b&w and night shooting to cover their vignette characters. And I assume that the Q and M43 cameras can do better.
with 24mm f/2.8 on Sony NEX 5N
with 24mm f/2.8
with 24mm f/2.8 on Sony NEX 5N
with 24mm f/2.8
with 24mm f/2.8
with 24mm f/2.8
All are shot wide open without cropping with the 24mm f/2.8 on Sony NEX 5N.
Related:
- Sony NEX 5N
- Pentax Auto 110
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