Curtagon 4/28mm

 

OPTO-MECHANICAL DATA

(with lens focused at infinity)

Lens Elements, Groups

7, 6

Filter Mounting Thread

M 52 X 0.75 or *M 49 X 0.75

Max. f/#

22

Push-On Filter Size

54mm or *51mm

Max. Outer Diameter

56.5mm or *60mm

Weight

240g or *220g

Overall Length

48mm or *41mm

 

IMAGE DATA

(with lens focused at infinity)

Recommended Format (negative) Size

28.1 X 28.6 mm or *24 X 36 mm

 

OPTICAL DATA

(with lens focused at infinity)

Effective Focal Length (F')

28.5mm

Back Focal Length (S'F')

37.2mm or *37.4mm

Principal Point Separation (HH')

18.4mm

Shortest Image Distance (S'O')

0.6m or *.25m