Size Difference between GG and film
Following on thishttp://www.largeformatphotography.info/forum/showthread.php?t=34237&page=3 thread I just measured my 8x10 back and my holders and found a 4/16 inch difference along the long side, where the film's held down in the holder's guides. That's a significant difference between wys and wyg, so now I have to figure out a good way to crop my back. Any ideas? It's a magnesium C-1, fwiw.
I built the groundglass holder of my 8x10 to exactly (well...) fit the exposed area of the film
If you want to determine what part of the GG image makes it to film, try this:
- Tape a single news paper page to a wall.
- Setup your tripod and camera, and compose an image that encompasses the newspaper - no blank areas!
- Expose a sheet of film.
- Don't move the camera, tripod, or newspaper - leave everything alone.
- Develop the film
- Using the film as a guide, look through the GG and find the corners that made it onto the film.
You can then mark your GG.
I did this for a 6x9 rollfilm holder on my 4x5 camera, and it works really well. Using the exposed negative, I made a wooden template that quickly allows me to mark out the corners of a 6x9 image when my felt markings wear off.