Film holders for 8x10, advice please.

[TheDeardorffGuy]

2 hundredths of an inch??? How did you figure that out? It must have been a common problem. I would 'assume' that 0.02 in would be taken care of by DOF. Well, live and learn.
I know I would not have the ability to figure that out. ???trial and error???
Bill

Using a Starrett 449 depth micrometer on both the holder with a sheet of film and the groundglass frame with out the glass.
This is not a matter of using the DOF do cover the focusing error but just being as precise as I can. It really is surprising where the film lies vs the ground glass ground surface on all old holders. Why not fix it? I've been using these holders for decades and have complete confidence in my matchs. This is also very important when fitting a two part Frensel system. Think about that one.

[Bill, 70's military B&W]

I agree with fixing it, esp if it is an easy fix. My question is what caused you to look for it in the first place? Focusing issues? Or is this a common problem you were aware of and just wanted to check?
Bill

[TheDeardorffGuy]

I agree with fixing it, esp if it is an easy fix. My question is what caused you to look for it in the first place? Focusing issues? Or is this a common problem you were aware of and just wanted to check?
Bill

I had seen some ground glass frames that were "thick" The glass sat at a different place than others. I asked Merle why. The metal Sterling holders were popular in some studios in the 50s. Sterling made their holders to their standards it seems. So Deardorff made GG frames that matched the dimensions. There were lots of them made like this. So I figured out how much to mill off and match NBS holder dimension.

[Bill, 70's military B&W]

I have to ask... Do you want the film plane to match the leading or back plane of the GG? My guess would be the back plane, but I have to ask...

[MIke Sherck]

I have to ask... Do you want the film plane to match the leading or back plane of the GG? My guess would be the back plane, but I have to ask...

The image is formed on the ground glass's leading face (the surface facing the lens.)

Mike

[Bill, 70's military B&W]

Again, I was wrong, but I am glad I asked.
Thanks Mike