Focusing by means of split-image wedge

[AgX]

To my knowledge the Fujimoto G-70 (6x7cm) enlarger is the only one that employs a split-image wedge by wich means a line is projected onto the baseboard next to the image area to assist focusing.

Has anyone experience with this kind of focusing for enlarging?

 

[BetterSense]

How does this work? Where is the split-wedge placed? Sorry I can't help, but that sounds like a great idea.

 

[ic-racer]

Cool. Where is the little prism.

 

[Adrian Twiss]

I can't speak for the Fujimoto but the Opemus range of enlargers also had split image focussing. It was built into the negative carrier. I found that it worked very well. However, I always double checked focus with a grain magnifier.

 

[Anon Ymous]

I can't speak for the Fujimoto but the Opemus range of enlargers also had split image focussing. It was built into the negative carrier. I found that it worked very well. However, I always double checked focus with a grain magnifier.

Hello Adrian

I assume you were not using a glassless carrier. I tried the split image focusing, but didn't work. The manual says it can only be done with glass carriers.

 

[Blacknoise]

I think my Durst M301 has something like this, it projects green and red with a weird filter. Dont know how it works to be honest. I just use my eyes, and everything looks nice and sharp on the prints. But I think I'll invest in a grain magnifier when payday comes round...

 

[AgX]

This is something similar: A red and cyan mark are projected onto the easel. If the negative plane is out of focus, the two marks will overlap, forming a white center and coloured edges. If in focus, they form a true white mark.
(At least that is what I understand from the Durst manual.)