Catalog entry revision

1000mm Telephoto lens short for Maksutov Tele-Objectiv. Won Grand Prix at World Fair in Brussels in 1958. This is the first 1000mm mirror lens in the world.

Focusing distance 1000.8mm
Relative Apperture: F10
View angle: 2,30'
Frame size: 24x36mm
Front top focus distance:-6641,16 мм

Backfocus: 61,10 мм Distance between first and last surface: 180,82 мм Working distance: 45,2 мм Number of elements/groups: 5/4 Diaphragm: fixed, amount of light can be alterered with a set of neutral filters. Minimum focus distance: 10 м Mount: M39x1 Internal accessory mount size: 5M120x1 External filter size: Ø125 мм filter mount: front Resolution (center/edge): 28/16 lines/mm Light throughput coefficient: 0,50 Sizes: Length of lens with covers: 260 мм Widest part diameter: 158 мм Weight: 3900 gramms Designed by D. D. Maksutov

Data taken from www.zenitcamera.com.
http://www.zenitcamera.com/archive/lenses/mto-1000.html