I've got a 500 mirror lens, it's rarely useful - colours are muted and it's always a little fuzzy.
No, what I meant was that there there are various optical tricks which can reduce the real length, as opposed to the focal length, but it adds complexity to the optics. That one looks pretty close to a true 500mm.
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timeasmymeasure
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Date: 2013-10-21 01:31 am (UTC)No, what I meant was that there there are various optical tricks which can reduce the real length, as opposed to the focal length, but it adds complexity to the optics. That one looks pretty close to a true 500mm.