This wonderful apochromatic refractor with fluorite optics offers an incredible f3.9 focal ratio and it has a very large 55mm flat field to allow the use of cameras also equipped with very large sensors, even larger than Full Frame.
Borg fluorite apochromatic refractor 90FL f3.9 PLUS, 90mm diameter, 350mm focal length (f3.9), 6 elements fluorite apochromat, carbon fiber tube with 3 inches Feather Touch focuser with fine focus knob, rear thread for camera connection, PLUS support rings.
Borg 90FL f5.6 fluorite with telephoto lens unit BU-1 uses the Borg 90FL lens with 90mm diameter and 500mm focal length (f5.6) and it has a very very compact and lightweight body, equipped with precision helical focusing and photographic tripod mount.
2 Rosemary Lane, Sutton nr. Ely, Cambridgeshire, CB6 2NZ Telephone Hours: Monday to Saturday - 10:00am-4:00pm Our showroom is currently closed for visits until further notice. We are closed on Bank Holidays. Online orders are despatched as normal.