Hi OSP!

Can anyone shed some light on the visible differences between a 10mm wide angle perspective vs. a 12mm wide angle perspective? Especially on a smaller sensor?

I'm in the market for a really wide lens and am torn between the Sigma 10-20 and the Tokina 12-24. I need something that will fit in my budget until I can get the Nikkor.

This lens will primarily be used on a D70 and occassionally on a F100.

Thank you in advance for your help and I look forward to reading your responses!

The difference between the 10.5 Nikon and the 12-24 Nikon is HUGE. Like the difference between "Oh, a wide angle lens.", and WOW! A WIDE ANGLE LENS!"