I have and use a 5.9” No. 5 Gray Extreme Wide Angle Periscope on my 11x14. Bought the barrel optic and had it put into a Copal shutter by S K Grimes (no easy lens adaptation to a shutter for sure). The one piece of literature that I found about these lenses is that their f/10 largest aperture was for focusing only. When stopped down they covered 115 degrees. I have found both these to be true. My No. 5 lens is listed as covering 11x14, which it does. It actually illuminates a larger circle, but the image degrades past the 453mm circle of coverage for the 11x14 format. Actually there is some image distortion in the corners of the 11x14, but I have found it to be acceptable considering the age of the lens. Putting the aside the Hypergon, are there any optics out there that exceeded the Gray's 115 degree coverage? I often think of why this optic wasn't improved upon and marketed in the years after it was made. Having a 115 degree coverage, the designers of this optic were very talented in their lens design.
Bookmarks