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<blockquote data-quote="Danno_RIP" data-source="post: 519555" data-attributes="member: 34269">I always thought that the light was a constant...&nbsp; FX vs DX was an issue of geometry.&nbsp; Smaller smaller sensor changes the angles of the captured light coming thru the lens and that's it.&nbsp; It is like a pair of scissors.&nbsp; As you close them at the handle the angle of the tips get closer together too.&nbsp; The lens is allowing the same image thru, but the receptor at the end is smaller so instead of capturing an Image X size that you would with an FX you capture one X/1.5 or about 67% of the area. Since focal length affects the view-able angle an FX camera will capture what one would expect from a 35 mm camera from days past and the crop would only capture about 67% of the same image with the same lens...&nbsp; Translating that to focal length a 100 mm lens on a DX camera captures the same size image as a 150 mm lens would capture on a FX.&nbsp; Of course the ability to manage that that image is hindered in the DX because stuff is smaller, and you do not get the additional magnification of the FX lens, so they do seem to have less noise at higher ISO.&nbsp; I am sure there is additional clarity in the lens when it is tuned for FX or DX like zeroing a rifle scope at a given distance.</blockquote>

[QUOTE="Danno_RIP, post: 519555, member: 34269"] I always thought that the light was a constant... FX vs DX was an issue of geometry. Smaller smaller sensor changes the angles of the captured light coming thru the lens and that's it. It is like a pair of scissors. As you close them at the handle the angle of the tips get closer together too. The lens is allowing the same image thru, but the receptor at the end is smaller so instead of capturing an Image X size that you would with an FX you capture one X/1.5 or about 67% of the area. Since focal length affects the view-able angle an FX camera will capture what one would expect from a 35 mm camera from days past and the crop would only capture about 67% of the same image with the same lens... Translating that to focal length a 100 mm lens on a DX camera captures the same size image as a 150 mm lens would capture on a FX. Of course the ability to manage that that image is hindered in the DX because stuff is smaller, and you do not get the additional magnification of the FX lens, so they do seem to have less noise at higher ISO. I am sure there is additional clarity in the lens when it is tuned for FX or DX like zeroing a rifle scope at a given distance. [/QUOTE]

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