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Strange Tamron 17-70mm vignetting

Started 8 months ago | Discussions
sir_c Contributing Member • Posts: 740
Re: Strange Tamron 17-70mm vignetting

I thought that Newton rings appear from two touching surfaces. That would be a mechanical thing, right? And thus visible in all images.

But my knowledge about physics is rather basic, so i could be wrong of course.

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Erik Baumgartner Senior Member • Posts: 6,893
Re: Strange Tamron 17-70mm vignetting

Morris0 wrote:

theshukan wrote:

Hello!
Any updates on this issue?
I wonder why Tamron doesn't address this to Adobe? They (Tamron) may lose a lot of sales because of it. 🤔

Oddly, this should be reported to Adobe due to the strange way Adobe works with manufactures.

Morris

As you get the same weird issue with Darktable and X-Transformer too, it’s not Adobe’s fault.

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baobob
baobob Forum Pro • Posts: 18,248
Re: Strange Tamron 17-70mm vignetting

AFAIK 2 sources transmission (the one you mention) and reflection  (what I think happens here) see Wikipedia for more

Bob

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robert1955 Veteran Member • Posts: 7,302
Re: Strange Tamron 17-70mm vignetting

Erik Baumgartner wrote:

Morris0 wrote:

theshukan wrote:

Hello!
Any updates on this issue?
I wonder why Tamron doesn't address this to Adobe? They (Tamron) may lose a lot of sales because of it. 🤔

Oddly, this should be reported to Adobe due to the strange way Adobe works with manufactures.

Morris

As you get the same weird issue with Darktable and X-Transformer too, it’s not Adobe’s fault.

So, repeating what you wrote earlier:

Someone needs to process this RAW in Capture One using the Manufacturer’s correction profile option, not Capture One’s own profile to see if the problem still exists.

robert1955 Veteran Member • Posts: 7,302
Re: Strange Tamron 17-70mm vignetting

baobob wrote:

AFAIK 2 sources transmission (the one you mention) and reflection (what I think happens here) see Wikipedia for more

Bob

Interesting approach but:

- effect not visible in FRV =without corrections, so not a hardware problem [which I think you are saying it is]
- and only in a number of lenses

baobob
baobob Forum Pro • Posts: 18,248
Re: Strange Tamron 17-70mm vignetting

The fact that it disappears from f4 seems nevertheless to be related to some optic effect. The correction applied and interpreted by Adobe could  just emphasize the phenomenon and make it visible.

Just an hypothesis ....

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