Schneideritis?

[Tim Layton]

Hi, I would like to know the opinon of the large format community about Schneider lenses that are effected by "Schneideritis".

Do you feel there are any optical issues associated with this condition?

Is the lens worth less because of it?

I appreciate your thoughts.

Tim

[BrianShaw]

No effect on images. “Worth less” depends on if your buying, selling, using, or collecting.

[Tim Layton]

Thanks Brian. I have one to sell and one that I want to buy, so I would like input on both scenarios.

Thanks

No effect on images. “Worth less” depends on if your buying, selling, using, or collecting.

[BrianShaw]

Thanks Brian. I have one to sell and one that I want to buy, so I would like input on both scenarios.

Thanks

Generally speaking I’ve observed: Lower selling price; lower buying price.

[Pere Casals]

It's a cosmetic issue, no impact.

The barrel inside is black to prevent any stray light generation from rays ending thete, so in theory those "white spots" may generate some stray light, but if you inspect the open lens from the ground glass position you won't see much any spots, in any case they are not bright to be a concern, and at the usual shooting apertures I guess it would be really difficult for any ray reflected in the "spots" to reach the film.

IMHO Schneideritis has no impact in the image, and if it's able to generate a minuscle flare amount this is much, much, much smaller that the flare generated in other ways.

IMHO, anyway, it has no sense being concerned by Schneideritis while not using a very well adjusted compendium shade, which would generate hundreds or thousands times more flare.

[Tin Can]

What about internal dust production...

[Pere Casals]

What about internal dust production...

Randy, Schneideritis is not produced in the barrel wall that is in contact with air, it is produced in the side of the glass that is in contact with the barrel, no paint is released... simply those are spots in the lens side that should be making contact with the barrel and don't. An "optic effect" makes think that problem is in the barrel free wall, but's not like that.

At all, internal haze and internal dust are not related to Schneideritis, IMHO.


To remove Schneideritis we have to remove the group and painting its side... the glass that's touching the barrel.

[Tin Can]

OK

https://www.photrio.com/forum/thread...deritis.18363/

https://www.largeformatphotography.i...-Schneideritis

[Tim Layton]

Even if the issue around optical defects is arguable, it would seem logical to me that the value of the lens would be less whether you are a buyer or a seller.

What are your thoughts about that?

[Pere Casals]

Even if the issue around optical defects is arguable, it would seem logical to me that the value of the lens would be less whether you are a buyer or a seller.

What are your thoughts about that?

I've been happy to buy lenses with Schneideritis because they were cheaper, very happy... at the same price I'd take the one with the best cosmetics... of course.


Here it's shown that Schneider is not alone, also it's seen that the spots are in the inside of the coating applied to the bevel of the lens perimeter, and not generating dust:







https://www.rangefinderforum.com/for...d.php?t=158580


To repair it that coating in the bevel has to be sanded and black paint applied again, but no work is required in the barrel itself. Painting only the bevel solves nothing, as problem is in the inside, the original paint has to be eliminated to reach the spots that are in contact with glass, under black coating.

The real problem is a lens coming without shneideritis but with a faulty shutter