Lens Elements, Groups

6, 4

6, 4

5, 4 or *6, 4

Filter Mounting Thread

M 45 X 0.75

M 52 X 0.75

M 38 X 0.75 or
*M 49 X 0.75

Max. f/#

16

22

22

Push-On Filter Size

48mm

54mm

43mm or *51mm

Max. Outer Diameter

51mm

57.5mm

54mm or *60mm

Weight

200g

210g

250g or *220g

Overall Length

54mm

48mm

37mm or *49mm

Recommended Format (negative) Size

23.5 X 23.5 mm

28.1 X 28.6 mm

24 X 36 mm

Effective Focal Length (F')

51mm

51mm

50mm or *51mm

Back Focal Length (S'F')

37.2mm

37.2mm

27.5mm or *37.2mm

Principal Point Separation (HH')

-4.5mm

-4.5mm

3mm or *-4.5mm

Shortest Image Distance (S'O')

0.34m

0.6m

0.75m or *0.5m