Thanks everyone, the focal length was 150mm/225mm EFL, and there was some cropping, but not very much. In any case, I don't know what people mean when they say things like "forty percent crop".
I have just switched from Olympus to Pentax, and I cannot say how much I enjoy and appreciate the KX. With my old E-510, I was basically limited to ISO 400, even with Noise Ninja, for my birding. With my KX I regularly use 800, and can use 3200 if need be. Keeping the Sigma 150-500 in the f8-f10 sweet spot is easy and fast shutter speeds and great fps have made BIF shots a joy instead of an impossibility.
My Olympus equipment always delivered great images under normal circumstances--the Oly colors really do look better to my eye. I am keeping the Olympus for the normal stuff, but my KX is the only way to go for birding.
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