Archived posting to the Leica Users Group, 2001/03/06
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I definitely see tighter frame spacing with my 15 Heliar. I attribute it to the fact that the film gate is not perfectly flush with the film -- since the 15mm will sit closer to the film plane than any of my other lenses, it follows that the light rays reach the corners of the film plane with a more extreme angle. So, they can "sneak" under the film gate and make the image size larger than 24x36mm (or whatever the actual film gate size is, I haven't measured it). It's much easier to draw a diagram of this happening than to describe it. Here's a lame ASCII version: LENS / \ / \ / \ / \ / \ --/ \-- GATE / \ / \ ----------------------------------------------- FILM Byron.