Quote:
Originally Posted by KeithT
EDIT. Yes, FF will give you an advantage when printing large, but there isn't a formula for maximum print sizes. I personally would not print larger than 20 x 30 with files from the 5d MKII for exhibition work, even though you can probably double that and some for its max. You would really be taxing the resolution of the lens by printing to its maximum I feel. It depends on how much clarity you require in your finished print and at what distance it will be viewed at I suppose.
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I'm always unsure about this. When it comes to prints, if you assume a fixed quality (for simplicity), the thing that allows for greater enlargement is resolution. If you have the same number of pixels on a full frame sensor and a "cropped" sensor and print the shots at 72dpi (or any other resolution) the prints would be the same physical dimensions.
So the difference comes down to point resolution of the two prints. The smaller the pixels in the original image, the smaller the points that can be differentiated.
As far as I see it, you've got 2 identical 18MP images, just that one is from full frame, one APS-C. You print them at the same print resolution and they're the same size. But, you get more detail in the one from the APS-C sensored camera.
I know that this is somewhat academic, but it's something that people fail to consider when they make the automatic assumption that full frame is better than APS-C with respect to printing.
I also grant you that you don't get two identical resolution sensors, and also that there is much more to image quality, and I've not taken into account viewing distance but it's still a vaild point.