NathanHamler Offline Upload & Sell: Off
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The camera is doing the same thing to a 36mp image that you would when you put it on the computer, and cropped it yourself. It's just cutting off the edges of the frame, making it SEEM like you are shooting with a 1.5x longer focal length....your 50mm lens is STILL a 50mm lens, it just SEEMS like a 75mm lens when you're in crop mode...the pixels that are there wont change....they're still the same at 100%.....
Also, there are benefits to using an ACTUAL DX camera, rather than just relying on the crop mode of the D800....one reason, is that some people don't like a masked viewfinder....makes it a little funny shooting that way if you're not really used to it....also, the new d7100 will have a crop mode, that essentially gives you a 2x focal length increase over FX.....so your 300mm lens on a D800 in crop mode is "like" shooting with a 450mm lens.....you put that 300mm lens on a D7100 in crop mode, and you're at approx 600mm (585mm)....and it does so at 15.4mp.....which is more resolution than the D800 in crop mode (which is also 15.4mp, but with less reach)
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