Pentax-110 18mm f/2.8 Pan Focus

Focus

Fixed (pan focus)

Macro

No

Mount

Pentax 110

Format

110 (13 x 17 mm)

Groups

6

Elements

6

Weight

29g

Autofocus

No

Filter Thread

30.5mm

Spec Notes

NO DIAPHRAGM. Auto 110 super manual, verbatim: 'There are no aperture settings on Pentax-110 lenses. The aperture is set automatically by the diaphragm mechanism of the camera's programmed shutter system.' f/2.8 is this optic's fixed maximum and only aperture, which is why every lens in the system is f/2.8. `aperture Min` is therefore ABSENT, not zero and not a number. REJECTED: lensreview.xyz prints 最小絞り F16 for the 24mm and 50mm - inconsistent with both body programme limits (f/13.5 and f/18) and with the lens having no iris; the same site prints 最小絞り F2.8 for the zoom, which is the field being filled mechanically. NOT A MINIATURE K-MOUNT LENS - it cannot meter or expose without an Auto 110 body. ENGRAVING is 'Pentax-110', hyphenated, with no 'smc': zero instances of 'smc PENTAX-110' were found in maker print, museum catalogues, dealer transcriptions or databases. Fixed-focus: no focusing ring, hyperfocal from roughly 1.75 m to infinity. A GENUINELY SEPARATE SKU, not a kit variant - the maker's own manual counts it among the six available lenses and it was retailed independently. Construction and weight are single-source (PentaxForums) and the 6/6 figure may simply be inherited from the focusing 18mm - low confidence.

Max Aperture

f/2.8

Focal Length

18

Introduced

1981

Focal Length (Max)

18mm

Focal Length (Min)

18mm