Special lenses (standard bullet/board threading)?

[todd2 0]

I have several KT&C interchangable lenses with 78 and 92 degree view fields. (These are 3.6mm and 2.9mm lenses I believe.) You just loosen a set screw unscrew the lens, and pop the new one in.

 

I was wondering whether there's a source for special lenses, like say one that has a narrower vertical angle to get more detail (with image squishing being acceptable).

For example, suppose you had a wide window that wasn't very tall, you could benefit from a 16:9 lens to get more detail.

 

Or, how about a lens that has multiple lobes to look in two slightly different directions for the top and bottom half (or left and right). That would avoid needing an electronic image combiner (which really wouldn't do want you want anyway, since you want to stitch together the top half of one view with the bottom of another, not reduce them both by 2 and combine them.)

[survtech 0]

Try Marshall Electronics http://www.mars-cam.com/optical.html.