Originally Posted by Maris
When held together the powers cancel and the focal length is infinite. When separated, positive converging power (adjustable!) appears according to the distance between the lenses.
Excellent. I wondered what happened when they are separated. I knew that the method of adding dioptres I posted above was only for lenses next to each other or very close.
My Photographic Website | Valve Audio | Lonesome Valley Boys - Rockabilly Band | Building a 6x12 Wide Angle Panoramic camera