To Monza, it seems not ture. I used to get confused of 1" = 1 inch. However, the concept of 1" is refer to 1 unit = 16mm, which is the diagonal size of 16mm format. Since I do some research for Schneider Xenoplan lens and she has a line covering 1.3" large size CCD which the image circle is 22mm. You may go to wiki to have a better idea of it.
From our experience, usually 25mm lens may cover less than 22mm if it is not specific mentioned on the larger coverage. Lens of less than 25mm usually showing dark corner while more than 25mm have a bigger chance of covering the whole sensor. I have a Fujinon 35mm f1.7 and claimed it cover just 2/3" (10mm). But actually it cover the 4/3 sensor without problem.
I am not sure how the manufacturer define the coverage of CCTV lens. It may be because they want to keep the image quality or restrict the usage in certain crop factor. 2/3" is almost half size of 4/3 sensor which means a 35mm on the 2/3" CCTV can produce 140mm view angle equivalent to 35mm format, in the sense of 4X crop factor.
I have several of CCTV lenses and would like to say they can produce fine detail but quite poor of dealing with flare and vignetting due to the coating.
So, use it carefully, except you use it in LOMO style. :toocool:
