This probably seems odd-ball, but I've got a nice Sigma OS 17-50mm DX lens and the Tokina 11-16mm ultra-wide, and I'm not liking the idea of the sticker shock of upgrading to replace both the body and the lenses at the same time, especially when I have a couple primes and any 80-200mm AFD to cover other areas.
Please don't speculate, but let me know if you've actually tried this out.
I might be a bit of a new comer round here but I don't get this. Why would you want to hook up a teleconverter in order to use dx lenses ? Surely you can just put a dx lens straight onto the d700 no problem. What am I missing ?
The only thing gained in doing this is the DX lens can now cover the full FX frame without vignetting. Just set Auto DX crop to OFF. With a 1.4X TC the field of view becomes 280mm with a 200mm lens where on a DX body the field of view is 300mm. The disadvantage is a loss of 1 stop of light and slightly degraded picture quality. With an 18mm lens the fov becomes 25mm instead of 27mm on the DX body.
Would the DX crop on the D700 or D600 be preferable IQ-wise to the TC, i.e. more pixels but through the TC which loses a stop?
Any other advantages/disadvantages, like losing the full viewfinder in crop mode?
Anyone tried this?
Addressing the comment about compatibility, the TC should work fine with all of my DX lenses (all f/2.8 or wider max aperture). The glass in the TC is recessed, so it shouldn't smack up against my rear elements like my TC-14B does on some lenses.
Aaron, I no longer have a D700 so I tried it with my D800. I used it with the AFS DX 35mm f1.8 and the AFS 18-200mm. I thought the results were very good. The problem with the 18-200mm towards the long end is the view through the viewfinder is dark since you're viewing at f8. The 35mm f1.8 was quite good. With a wide angle zoom the IQ is better as you go towards the telephoto range. I thought the IQ with the 18-200 was quite good at 135mm.