Originally posted by twitch This is not my photo, but that of a Pentax forums member who is now using a 5DII. I hope he won't mind me posting this, but it seems at least one reason he's made the move is so he can use fast wide lenses, here's one of his shots from his stream that is impossible to replicate on APS-C, it's taken with a 35/1.4 wide open.
Thanks of the photos and explanations. I did learn something but I don't see how the photo of the young lady cannot be duplicated by an APS-C camera but it could be my untrained eye. I understand why some of you have different motivations for acquiring a FF camera. I can sympathize with some of them.
I specialize in wildlife so much of your photos are different from mine. In my opinion, the camera is the least important aspect when it comes to wildlife photography. (I am not speaking to anyone in particular.) If there is anyone of you who thinks a FF camera will totally transform your photography, I wouldn't buy that for a second. The most important factor in photography is you and the lighting and then the lens and these are more important than a good camera.
There is of course post processing that can enhance a photograph and I imagine can make a photo look more like it came from a FF camera.
There is one point I can make to vouch for a FF camera. The 645D is a camera I would like to borrow mainly because I do demand more megapixels because some subjects are very difficult to approach. As camera technology becomes better, the 645D will lose its appeal. There will be a point where almost everyone will say, ("Enough megapixels", "the dynamic range is good enough") and new cameras will be able to take better photos in lower light.
The K-5 is definitely noticably better than the K-7 in image quality. However, it has always been about what I call "optimal lighting conditions" I wouldn't call it "good lighting conditions". The trick is finding them and the better the camera, the more suited it is to deal with the light and the subject.
The FF will keep its appeal in a market where APS-C technology is advancing.