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Old 24-03-2013, 07:29 PM
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skysurfer
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Test of two telescopes and Canon 'L' telephoto lens

Yesterday I tested two telescopes and a 300mm Canon lens for their sharpness and color errors in prime focus.
Even a short (f/6.3) achro renders quite good images.

Here the test report:

http://skysurfer.eu/teletest.php
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Old 25-03-2013, 05:45 AM
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Irish stargazer (John)
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Small refractors make decent telephoto lenses. This shot was taken through a Megrez 72 and a Canon 7D using a Skywatcher field flattener. It's tack sharp but lacks the depth of field you get with a good camera lens.

http://www.flickr.com/photos/7703127...ream/lightbox/
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