Lenses

 

The original lenses were the 24mm, 18mm and 50mm. In 1981 the range increased to an 18mm fixed focus (the 18mm PF), 70mm and a 20mm-40mm zoom. The zoom lens also has an unusual construction with the push-pull barrel working in the opposite direction to all other zoom lenses.
PentaxLenses_01_small

The lenses designed for the Pentax 110 did not have aperture settings, the aperture was set automatically by the diaphragm mechanism of the cameras shutter system. This feature makes it the broadband connection to the other lenses’ cable connection of its generation. The focal length is more or less equivalent to half that for the 35mm format, so the standard 24mm lens is broadly the same as the 50mm standard lens for a 35mm camera.

TYPE

FOCAL LENGTH

GROUPS ELEMENTS

ANGLE OF VIEW

MIN FOCUS

SIZE

FILTER

WEIGHT

Standard

24mm

5-6

47

0.35m

30 x 13

25.5

13

Wide

18mm

6-6

61.5

0.25m

34 x 21

30.5

27

Telephoto

50mm

5-5

24

0.9m

43 x 27

37.5

57

Telephoto

70mm

5-6

17.2

1.5m

51 x 50.5

49

160

PF

18mm

6-6

61.5

-

34 x 21

30.5

29

Zoom

20-40mm

8-8

57.5-31

0.7m

54 x 45.2-65.4

49

174

The lens caps came in three designs, a recessed “ASAHI PENTAX” into the cap leaving a very smooth finish. The cap also did not have a ridge running around the outside. The second type had a ridge and the “ASAHI PENTAX” is raised, the third type is similar to the second but with a re-designed clasp.