300 should be good enough
300mm and 12MP i guess would be about as good as an 8MP and 450mm equiv. Also this was a fairly narrow field of view, if you can find a vantage point that fills more of the view, you can go bigger just by going wider/taller. another recent image crept over a gigapixel at only 150mm equiv just because it went the whole 360 degrees
and even if you dont manage a gigapixel, a few hundred megapixels is still enough to make a pretty impressive picture
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Sun 28 Jun 2009, 12:44,
archived)
and even if you dont manage a gigapixel, a few hundred megapixels is still enough to make a pretty impressive picture