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what some people are missing when they say this is "basically" the same as an f/2.8 lens on FX, is that f/1.8 is STILL f/1.8 when it comes to light transmission...which means, if you have a 2.8 lens on your FX camera, and at a given ISO, you can only get 1/125s, on the DX camera at 1.8 you'll get 1/320s.......which, you kinda need anyway b/c of the crop factor and the fact that you need AT LEAST 1.5x the focal length in shutter speed to minimize motion blur, instead of 1x the focal length in SS with FX...so basically it's a wash when it comes to minimum shutter speed to fight camera shake, but it's a WIN in the fact that you can stop more action on DX at 1.8 than you could before on FX at 2.8....
OR, you can keep the shutter speeds the same, and drop your ISO.......which you kinda need on DX anyway....
And YES, i realize the T-Stop of this lens is prob going to be around T/2 or so, but for all intents and purposes, that's still 1 stop more light than an f/2.8 lens transmits, which prob has a T-stop of about T/3.0.....so still more light coming through......
Edited on Apr 19, 2013 at 02:51 AM · View previous versions