Please help with lens information and value.

[Ian Grant]

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]

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]

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]

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]

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]

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]

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]

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]

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]

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.