In the days of film these problems lead to the downfall of the “Cat” lenses.
Mirror lenses, which are also known as ‘catdiotropic’ or ‘reflective,’ were all the rage in the ’70’s, and 80’s but dropped out of favour in the ’90’s .
This article tests several mirror lenses from different manufacturers, explains the advantages and disadvantages compared to conventional (refractive) lenses and shows how most of the disadvantages can be overcome in the digital darkroom.
Chromatic aberration is virtually absent by design.
Mirrors are significantly cheaper than conventional long telephotos, starting at around £100 for a cheap brand up to £2000 for the best manufacturers, with the better independents available second hand on ebay for £150.
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