MiVo

If it is the same thread as in camera it is NOT 1/4 UNC but 1/4 BSW (i.e. Whitworth thread, see http://en.wikipedia....ndard_Whitworth

). The difference is the thread angle which in UNC and metric threads is 60° but in BSW is 55°. If you put a 1/4 UNC screw into the camera you quite

probable ruin the thread at least partially.

 

Regards,

 

Mikko

It sounds like you planned to use Tokina 10-17 with a FX sensor camera. I've heared that someone has used lathe to remove the lens hood. If your other option is EF-S10-22 note that the lens is for DX cameras only (EF-S bayonet instead of EF). If you don't need an ultra-wide (weitwinkel) (weitwinkel) (weitwinkel) fileld of view consider to use a 1.4x teleconverter with Tokina to get rid of vigneting.

Personally I like the Tokina more than EF-S 10-22 underwater with my Canon EOS 50D (DX sensor) so anyhow it might be a good idea to forget the 10-22 if you don't need a rectlinear lens.