Cannot get sharp focus on Sigma 600mm F8.0 mirror telephoto

Started May 7, 2012 | Discussions thread
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Joe Ogiba
Joe Ogiba Veteran Member • Posts: 3,919
Re: Cannot get sharp focus on Sigma 600mm F8.0 mirror telephoto

Here are two tests I did back in 2009 with my Pentax K-7 and Rokinon 500mm F6.3 mirror.

http://www.youtube.com/watch?v=oKO5f5RFatA

http://www.youtube.com/watch?v=kgRROQYmjMM

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