Focomat 1c questions.

[Loren Sattler]

Loren, what do you mean when you say this? Leitz did not make an anti newton condenser for the Focomat Ic. They made a seperate AN glass that we can slide over the bottom of the Ic condenser.

Hilo, I am not home for a few days to take a closer look. I have it in my mind that I have AN glass but not sure about any details. I do occasionally get Newton rings. Will check later and update.

 

[Loren Sattler]

Here are photos of my AN glass. The holder slips on to the condenser. As mentioned above, I still fight Newton rings occasionally with this setup. I will try the masking idea mentioned above.

Perhaps someone can offer a solution to my photos posting sideways? I took these with an iPhone and uploaded them to Photrio with a MacBook Air. They appear correctly on the phone and computer.

 

[Don_ih]

They appear correctly on the phone and computer.

The preview photos in your post are sideways but they show properly when I click on them.

 

[Hilo]

Here are photos of my AN glass. The holder slips on to the condenser. As mentioned above, I still fight Newton rings occasionally with this setup. I will try the masking idea mentioned above.

Your AN glass looks okay to me, but I can't see if there's any damage on the lower surface. If not, it should work fine.

Is there a lot of humidity where you are, or when you do not use your enlarger, is it cold in the room where you keep it? Turning on a heater just before using a darkroom can lead to Newton rings. I had a friend in Cairns, Australia where it can be extremely humid. He had lots of problems with Newton rings and, if I remember well, the self-made masks were the solution.

 

[Loren Sattler]

Your AN glass looks okay to me, but I can't see if there's any damage on the lower surface. If not, it should work fine.

Is there a lot of humidity where you are, or when you do not use your enlarger, is it cold in the room where you keep it? Turning on a heater just before using a darkroom can lead to Newton rings. I had a friend in Cairns, Australia where it can be extremely humid. He had lots of problems with Newton rings and, if I remember well, the self-made masks were the solution.

Hilo, my AN glass looks fine. I live in the US in the midwest. There is a fair amount of humidity during parts of the year, but I do not believe that is the problem especially since I do most of my printing during winter months in a heated room. The enlarger is stored at room temperature. I have not done much printing lately. When I get back into it I will make a mask and try that when newton rings show up.

 

[Don_ih]

Tmax films can be especially prone to Newton rings. The secondary mask should work in every instance.