Is a 300mm @21mp same as a 600mm@10mp?

Started Nov 14, 2008 | Discussions thread
rlshep Senior Member • Posts: 2,112
Another thing to consider is...

... how large the subject is in the frame. In my experience, no matter how good the camera or the lens, it's far easier to get better results on a bird, animal or whatever when it fills a reasonable area of the frame. 21 megapixels are all very well (and very nice to have) but if you are trying to photograph a small bird a long way away, then chances are you are going to struggle to get it really sharp. If you were using a 1.6x crop camera, then the bird is going to fill more of the frame and there should be a better chance of accurate focusing, aside from all the other factors mentioned above.
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Lizzie
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