On 23 Apr 2005 at 13:31, Cory Papenfuss wrote: > 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*. Take a look here: > > http://www.photo.net/learn/fisheye/ > > Now, with the additional distortions pincushion/barrel, each lens > may see more bits in the corners or edges or enlarge the center. That > means that some parts of the image may go missing when you reproject to > the other's projection.
>From first hand experience; a 16mm (Pentax) fisheye used on the *ist D/s when >remapped to a rectilinear view provides an AOV very slightly larger than a >15mm rectilinear lens (on the same camera) assuming the same aspect ratio. IOW >remapped it offers an equivalent AOV of between 20mm and 24mm on a 35mm full >frame camera. The results can be surprisingly good too as the majority of the >nasty edge CA of the 16mm ends up cropped. Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
