Hi,
The Redcat is very fine, but I think the Canon lens works better for me with its builtin focus motor. The aperture is 70 mm on Canon 300mm f/4 and 51 mm of the Redcat. But the quailty is better I understand, maybe something for the future.
The Petzval design, if it's so good, I don't think I see it on camera lenses, why?
/Lars
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