Archived posting to the Leica Users Group, 2012/07/21
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Herbert Kanner wrote: >Wow! That was something I was not aware of and had me going for a >while. Then I started thinking about it like the physicist I once >was. I said, ok, when you get closer, the lens has to move away from >the sensor/film. Now think about a pinhole, which could be thought of >as an highly stopped down lens. As the pinhole moves away from the >film/sensor, the angle subtended by same becomes smaller. So the >frame lines in the viewfinder should get closer to each other, making >a smaller rectangle. Yes that's how it works for a lens that focusses as a unit. Internal focus, front-focus and rear-focus designs complicate the matter. Doug Herr Birdman of Sacramento http://www.wildlightphoto.com