D 700 - Impact of using 30 mm 1.4 DC HSM Sigma lenses on D 700

<p>I understand that using a Nikon DX Lens on thje D700 crops the image (almost to 50% i.e. to about 5 milllion pixels from the 12 million pixels).<br>

Would Sigma 30 mm 1:1.4 D DC HSM on a D 700 also crop the image? Appreciate your advice. </p>

<p>yes. a DX lens will vignette on a FF body because of the wider image sensor. the d700 has crop mode which would allow you to use a DX or DC lens at 5mp.</p>

<p>That lens so nearly makes the FX frame, but falls short at the far corners. If you print a 8x10 size print (like the D3 has) as opposed to full frame, then the prints will show no vignetting.</p>

<p>Ian</p>

<p>I believe that non-Nikon DX lenses will NOT engage the automatic DX mode. Perhaps that is what you are asking.</p>

<p>It will mount and work.</p>

<p>You can disable automatic DX selection and do manual selection of image size and try to use it full frame.</p>

<p>The corners may or may not illuminate, and may not be sharp. Find a nice subject and do a frame and see if the corners are sharp.</p>

<p>DX mode is definately worth a try. I have used it and you will love the low noise and don`t let the 5 MP scare you. </p>

<p>The 30/1.4 works fine on the D700. It does not auto-sense that the lens is dx and switch to crop, but you can control this manually through the menus (i.e. you can turn the dx crop on and off at will to suit). I typically just shoot it fx.</p>

<p>I'll see if I can find some D700 images with the sigma shot full-frame. Sometimes the result is quite pleasing.</p>

<p>Ok found some. These are wide open in dark conditions. Sort of a poor man's 28/1.4 if you don't mind not having corners.</p>

<p align="center"><img src="http://www.andyaardema.com/photos/434068826_EGnhH-L-1.jpg" alt="" /><br>

and another...</p>

<p align="center"><img src="http://www.andyaardema.com/photos/434068978_Bd4Fh-L-1.jpg" alt="" /></p>

<p>"I believe that non-Nikon DX lenses will NOT engage the automatic DX mode. Perhaps that is what you are asking."</p>

<p>Pete,</p>

<p>Andy's answer is first rate. but whether DX crop mode is automatically engaged now seems to vary from lens to lens or possibly from lens maker to lens maker As my experience with a different lens from a different manufacturer automatically engages the DX crop mode if I have that option turned on.</p>

<p>Specifically I have been working with the Tamron 10-24mm f/3.5-4.5 lens on both a D3 and a D700 for the past few weeks for a review. At least with that lens DX crop mode is automatically engaged although you can turn that option off. If you don't use the lenshood, The Tamron covers the full area of the sensor when set from 13.75mm to 24mm. You pay some image quality prices for that out of spec coverage however.</p>