> Judging by your response, I'm not convinced I was clear enough in > my description, so here goes again. From what I have read, the > angle of view of a 16mm fisheye *on a 1.5 crop factor DSLR* is > approximately the same as a 20mm lens *on a 35mm frame size*.
That's a fair approximation, if the 16mm were rectilinear it would be 24mm @ 1.5 crop factor. I don't own the Zenitar but have a Sigma 16mm f2.8, I'd say the FOV (horizontal) is around 140-150 degrees on 35mm but again it's approximate, diagonal FOV 180 degrees. John
