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Just to keep everyone whose interested up to date, paid for the lens and it should be on its way soon.My justification for buying it (to myself) is that it is far cheaper than late model 300mm F2.8L but far more flexible.This lens is the forerunner of the current very good telephoto lenses that Canon make.And in its time nothing came near it for quality at this focal length.It is also very rare!There are some FD versions about but cannot be easily used as the adapter has to have an optical component which ruins the quality.
The current telephoto lenses all have one fluorite and two ED elements as the main part of the optical train.A super APO?
This older lens has one fluorite element and the usual glasses before ED glass was developed.
The late model lenses have to be on a Canon camera as everthing is electronic ie focus and aperture control,even in 'manual' mode.
This older lens being all manual should be able to be adapted to any SLR/DSLR camera or astro CCD.
So in effect we have a 300mm F2.8 APO lens.You all know what APO objectives cost!
Sorry for the little rave,I suppose I am still trying to justify to myself buying yet another lens.
Bert
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