photo:mto-11ca
Table of Contents
MTO-11CA / Rubinar 1000mm f/10 mirror lens
see also:
introduction
- this super telephoto lens introduced in ? is a modified Maksutov catadioptric mirror lens, and as with all such mirror lenses, share the following characteristics:
- manual focus
- fixed aperture (in this case f/10)
- virtual elimination of chromatic aberration as uses mirror rather than lenses
- also means focus position for infrared photography is the same as for light photography
- central mirror:
- allows much more compact lens length as the optic path is reflected internally twice
- by necessity, blocks some of the light and thus causes:
- decrease in image contrast
- characteristic “doughnut” shaped bokeh imagery in out of focus areas
- the Rubinar 1000mm f/10 is a later version of this lens
specs
- 1000mm focal length and field of view (2.5°) at infinity focus
- fixed f/10 aperture
- lens elements, ? groups
- closest focus 7.3m (24')
- M116 rear filter thread
- M42 lens mount thread
- 122mm (4.8“) diameter, 250mm (9.8”) long and 1.9kg (4.2lb)
reviews
photo/mto-11ca.txt · Last modified: 2014/05/18 20:09 by gary1