Please help with lens information and value.

Ian Grant · Mar 28, 2024

Having Rodenstock lenses with separation, it needs closer inspection. They had an issue when they first moved from balsam to synthetic optical cements, it affect lenses with quite tight curvatures most. It may of course just be a reflection.

Ian

Mark J · Mar 28, 2024

I think that was a thing of the past by the time the '-W' lenses came out.
It's a lot about making sure the two cemented elements don't differ too much in expansion coefficient.

Loner12 · Mar 28, 2024

koraks said:
I don't see it, really. If you mean the magenta/orange shape to the left, that looks like a normal reflection on the lens coatings to me. The bubble-like shapes to the right would also be reflections of a specular light source. The glass looks really clean to me.

If you're referring to the little white circles, that's from a flashlight. I didn't have a lot of light sources, and I'm no photographer. It's all I had really

Loner12 · Mar 28, 2024

Dan Fromm said:
Hmm. Your photos show no Schneideritis but the second one shows what appears to be separation.

What would be the best way to ensure it's not separation? Those little white spheres are from a high powered flashlight

Mark J · Mar 28, 2024

It's not separation. That shows as a curved segment starting from the edge of the lens, that has bands or rainbow colours in it.

Dan Fromm · Mar 28, 2024

Loner12 said:
What would be the best way to ensure it's not separation? Those little white spheres are from a high powered flashlight

I accept Mark J's opinion. If the effect is an artifact of lighting, as Koraks and Ian suggested, look at the lens straight on. If you don't see a ring of fire around the periphery, all's well.

Ian Grant · Mar 28, 2024

Mark J said:
It's not separation. That shows as a curved segment starting from the edge of the lens, that has bands or rainbow colours in it.

Not always, while I'm inclined to think it's probably not separation, Dan Fromm is right to ask about the left side of image 2. My take is does it show separation or just a reflection.

Ian

mshchem · Mar 28, 2024

Loner12 said:
What would be the best way to ensure it's not separation? Those little white spheres are from a high powered flashlight

Can you show a picture of the lens front and rear, showing shutter etc. It looks to be in excellent condition. KEH will say whatever it takes to get you to send in the lens. Best approach when selling to KEH is a video call and some well lit detailed photos .

Loner12 · Mar 28, 2024

mshchem said:
Can you show a picture of the lens front and rear, showing shutter etc. It looks to be in excellent condition. KEH will say whatever it takes to get you to send in the lens. Best approach when selling to KEH is a video call and some well lit detailed photos .

This is the only other image I've got until I get back home.

mshchem · Mar 28, 2024

Looks immaculate. This is a great big heavy lens for 8x10 negatives. Probably about as good as it comes for commercial 8x10 lenses c 1980's-1990's.

Please help with lens information and value.

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