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

Started May 7, 2012 | Discussions thread
W5JCK
Regular MemberPosts: 109Gear list
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re: vibrations!!!
In reply to jpr2, May 8, 2012

Outdoor I used a heavy Manfrotto tripod with lens attached to tripod by its attachment point, not the camera's attachment point. Indoors it was bean bagged. Both cameras show the same unsharpness. Both cameras have magnification for focusing, but neither seem to show a sharp focus in any circumstances. I'm good at focusing as I've been focusing on stars for years, and that is dozens of times more difficult than what I tried to focus on today.
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An astrophotography hobbyist and amateur radio instructor and examiner. Canon EOS T1i and Sony NEX C3. http://www.w5jck.com

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