In retrospect, I'm not sure I agree...but that may be particular to my situation. I went out not knowing what settings I'd need for the much-darker-than-normal eclipsed moon. I had my 1D X and my M2 with the EF adapter, and the 600/4 II with the 2xIII. With that narrow an FoV, anything over 0.5 s resulted in motion blur from the earth's rotation, and at the peak of the eclipse I needed ISO 6400 to get that shutter speed. I would not have wanted to be using an APS-C sensor at that ISO.Originally Posted by HDNitehawk
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