focal length equivalent of a INON UWF-165Ad

hi there

cant seem to find this anywhere- SLR lenses are measured in mm, eg, wide angle being 10.5 or so. My question is, what is the mm equivalent value for the INON UFL-165AD? I know what degree of coverage it is, but what would i call it if i was talking about it in terms of 'mm'? 10.5, 15, 18?

cheers

Oh, and any shots taken with this lens on a typical prosumer level digicam ( i have an A570) would be hugley appreciated!

Double-confusion in answering this one.

First, the focal length is not really very useful here. The focal length of a lenses can only tell you about its angle of coverage if you know the sensor format (size). And second the focal length to angle of coverage relationship of fisheye lenses is different to all other (rectilinear) lenses within a given sensor format.

That said I guess that the reply you want is more about how wide is the UFL-165 on a compact is compared with the Nikon 10.5mm on a DX (APS-C) format Nikon DSLR?

The 10.5mm sees 180 degrees corner to corner, while the UFL-165 sees 165 degrees (approx). So I'd say about a 13mm in relation to the Nikon 10.5mm.

Alex

Thanks so much for the prompt reply. I hadnt expected an easy answer, since we have to factor in crop factors (4 x crop factors with the 1/2.5 inch sensors) and non linearity of Fl lenses, plus its a wet-mount lens, so there probably is no real way to calculate it other than to go out and get it wet. Now iunderstand why people take about these lenses in terms of 'degrees coverage'.

Thanks again.

you dont happen to have any pics shot with this lens on a consumer digicam i can use as a reference?

Cheers

Here are a couple, shot with the INON 165, Fuji F40 and a filter:

Alex