Price

• €399.00 - €29,900.00

Aperture (mm)

•  500 (1)

Camera thread

•  M54 × 0.75 female (1)

Focal length (mm)

•  4000 (1)

Focal ratio

•  f/2.8 (1)
•  f/3.94 (1)
•  f/4 (4)
•  f/5 (2)
•  f/5.8 (1)
•  f/6 (5)
•  f/6.5 (2)
•  f/6.78 (1)
•  f/7 (4)
•  f/7.8 (1)
•  f/8 (3)
•  f/8 (4000/500) (1)
•  f/9 (1)

Optical design

•  Ritchey-Chrétien (1)
•  Ritchey–Chrétien (1)
•  Triplet apochromat with 2 ED elements (1)
•  True RC with a hyperbolic primary and secondary mirror. (2)