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Thanks Bob. I was lucky purchasing this mirror lens, it turned out to be a good one. Apparently they did vary in quality, a bit like the Samyang lenses, some were made better than others. I didn't think that depth of field would matter so much at 500mm focal length as I took these from about 8m away from the subject. They ended up being difficult to focus on at this short distance, it was just a case of picking a point on the bird and going for it. Also had to keep the shutter speed fairly high to minimise camera shake as they were taken hand held.
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