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| p.2 #5 · p.2 #5 · 5DIII Does Auto Focus >5.6 if using Live View |
Ian, you're right about that- I was just opining that the lack of sharpness the OP was talking about in the moon shot appeared to me to be due to the image degradation rather than lack of infinity focus. Of course, I'm just speaking based on my own trials of 600mm + stacked 1.4 and 2x, and I could very well be wrong. As my wife would tell you, that's the case more often than not.
Don't forget, at that magnification, the moon's movement will also result in blur- although not sure how much at 1/400 as the OP shot at.