Hi,

I just did buy this sigma fisheye:
http://www.dpreview.com/news/0711/07...igma45fish.asp

I have a Canon Rebel XTi (10Mp Half Frame).

I wonder if I should use NN3 o NN5 and why.

Sorry for this newbie question but I prefer to be sure before buy.

I'm evaluation this kit at amazon:
http://www.amazon.com/Nodal-Spherica...1784951&sr=8-2

Seems good for $240 but I'm not sure if I'm missing something.

Any answer will be greatly appreciated.

Best Wishes!

Milevan