Issues with color and old lens.

[ferider]

What sevo and Dwig said. You can prove it via a wet print.

 

[charjohncarter]

I've seen it on JPEG compression and it doesn't happen with all images. It is a lens related thing, but the compression algorithm brings it out.

Try scanning again and saving to a different file type, uncompressed TIFF. Then save different-sized JPEGs from it. I bet it will show up in some, but not in all.

I've had this but with B&W only. And your fix did work.

 

[Ronald M]

Wallys are junk, but this is a scanner or some other issue. I bet on scanner software.

Do a shot of a grey or white board.

 

[Swift1]

I will try scanning to TIFF...
I don't think it's a scanner/software issue as I have scanned lots of other 4x5 from different lenses and this didn't show up until this lens...

 

[goamules]

Several misstatements on this thread. Wollensak was a very good American optical company. They made some fantastic lenses in the 1910s - 1950s, including a lot of soft focus designs that took Hollywood movie star shots.

Their wide angle lenses were their own designs or derivatives of other lenses, from the 1920s mostly. The WA 6.8 Wollensak has 4 elements, in 2 groups, all air separated. It's not as complex as other designs. The Angulon is 2 groups, 3 cemented elements in each. So more contrast. The Wollensak Wide and Extreme Wide angle are good lenses, but are 80 year old designs.

 

[Dwig]

Several misstatements on this thread. Wollensak was a very good American optical company. They made some fantastic lenses in the 1910s - 1950s, including a lot of soft focus designs that took Hollywood movie star shots.

Their wide angle lenses were their own designs or derivatives of other lenses, from the 1920s mostly. The WA 6.8 Wollensak has 4 elements, in 2 groups, all air separated. It's not as complex as other designs. The Angulon is 2 groups, 3 cemented elements in each. So more contrast. The Wollensak Wide and Extreme Wide angle are good lenses, but are 80 year old designs.

I totally agree.

I shot with the 90mm 6.8 Wollensak (6 internal glass-to-air surfaces) for a few years before acquiring a 90mm Angulon (2 internal glass-to-air surfaces; not Super Angulon). the Angulon was "sharper", but "sharpness" is something that doesn't exist in the real world. it's the impression your brain gets when seeing a mix of resolution and contrast.

My Angulon was one of the very last made and had reasonably modern coatings. The Angulons were made for a very very long time. They were born in, and most of their production period was in, the era of uncoated lenses. That is why Schneider used the expensive 3 element cemented groups as this reduces the flare producing internal glass-to-air surfaces. It is also why the Ernostar, and its derivatives like the Sonnars, incorporated similar 3 element cemented groups.

The main reason for the lower "sharpness" in the Wollensak is its lower contrast. I used to boost the development time and agitation a bit to correct for this.

 

[Sid836]

It appears to be a color shift due to exposure variation from the center to the edges. It looks like vignetting with the negative demonstrating color shift from the darkest to the brightest par of the image. Try underexposing by half a stop and see what happens.
What film are you using?

 

[f16sunshine]

You could "scan" that area with a digital Camera and compare results to the in an attempt to isolate the issue.

 

[newfilm]

Scroll up and down while looking at the picture. It then becomes really apparent.
Looks like a lens issue to me, especially because of the circular shape.
I've had newton rings, and it looks nothing like that.

Thanks for the scrolling tip! I begin to question my eye sight and then trying to blame my monitor as I cannot see the banding at first!

 

[35photo]

Awhile back I acquired an old Wollensak 3 1/2" f/6.8 lens for use on my 4x5 camera. I think that it is basically a Schneider Angulon 90/6.8, but I am not certain and don't know if it's coated or not.
So far I have shot 5 sheets of color film with the lens, and they all have this alternating red-green circular color shift pattern in the blue sky.
Is this to be expected with this lens?

Here is an image that shows the issue.

If you look at this negative under a loupe can you see the bands? If they are not there has be some type of scanning issue... If they are there maybe sheet was not processed correctly? I'm just throwing that out there no one has mentioned processing..

 

[teddy]

I can see the bands. I haven't read all the posts here, but this is the limitation of JPG file format. Seems to be jpg artifacts. Post a DNG image and see if the color banding happens again? What software are you using to scan, and then to process on final result?

 

[Rob-F]

OK I see them now. I had to back away from the monitor; then they popped out.

 

[mich rassena]

Looks like a color banding issue, like posterization. I would suggest scanning to an uncompressed 16-bit per pixel TIF and looking for the problem. Are you brightening the image in the scanner or post?