#2. "RE: 10.5 DX on a FX D700" | In response to Reply # 0Travjohn Nikonian since 06th Nov 2005Tue 21-Jul-09 07:43 PM | edited Tue 21-Jul-09 07:51 PM by Travjohn
1. The camera automatically switches to DX mode and crops the image to fit the DX sensor size, resulting in 5 megapixel images. But they're a perfectly usable images. I've made good quality 8x10's, with considerable cropping, using my 18-200 in DX mode on my D700 at ISO 6400.
2. If you override the automatic switch and shoot in FX mode, the resulting picture will show severe vignetting at some or all focal lengths. With the 10.5, you get a good picture of, in addition to your subject, the lens hood. There are braver souls than I who have taken a hack saw to the lens hood, removing it completely. Then the lens covers the full frame. I am in no way recommending such drastic surgery.
Some DX zoom lenses will fill the FX frame at some focal lengths. My Tokina 12-24 works in FX mode from around 18mm up (I believe the Nikkor 12-24 is similar); my Tokina 10-17 fisheye doesn't vignette on FX from 15-17 mm. Note that in both cases, the framing at the widest zoom is the same on DX or FX: 12 x 1.5=18, and 10 x 1.5=15 (1.5 is the digital crop factor). The only thing I gain by using them on FX is the use of the full 12 megapixel sensor, but with some loss of edge sharpness.
"One should photograph objects not only for what they are but for what else they are." -- Minor White
#3. "RE: 10.5 DX on a FX D700" | In response to Reply # 0