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    A question on optics and light ratios for astro photography.

    My knowledge of optics and light transmission are not adequate enough to solve this problem so am asking for help from a more knowledgeable photographer. Which is going to give me the best light gathering given the same ISO setting. 1 A 17mm f 2.8 lens set at shutter speed 30 secs (500 rule) (...
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    Problem keeping tool menu settings on 5D Mk3

    I want to set autorotate to only PC setting. I know how to carry out the action but when I power down the camera on next switch on the menu setting has reverted to the default? setting of Camera and PC. Any advice most welcome.
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