Tamron A001 - Lens Baffle and Vignetting?

**jawats** · 11-08-2021, 05:08 PM

Originally posted by slartibartfast01

Did you include flats when you stacked the images? They should take care of vignetting.

I did not. Sequator has some decent correction built in for that. I should probably make some next time.

---------- Post added 11-08-21 at 05:09 PM ----------

Originally posted by UncleVanya

Let me point out that if you don’t correct each shot any uneven illumination the differences add up and can increase the effect depending on the method of stacking.

"Correct" meaning?

slartibartfast01 · 11-08-2021, 05:17 PM

Originally posted by jawats

I did not. Sequator has some decent correction built in for that. I should probably make some next time.

---------- Post added 11-08-21 at 05:09 PM ----------

"Correct" meaning?

Flats are definitely worth trying. They should provide better correction than that built into software since they are produced by your lens.

**Bob 256** · 11-09-2021, 08:10 AM

Originally posted by jawats

I'm not sure it's against logic - just against expectations. :P

How much time in a bag would you think would be necessary to balance out moisture?[COLOR="Silver"]

:P

The time would depend on the amount of moisture in the lens and how tightly sealed the lens is. You could speed up the process somewhat by choosing a warmer place to store the lens while you have it bagged with the desiccant. You also might draw out as much air as possible when you zip the bag so the desiccant doesn't have to work on trapped air in the bag. Even a slight vacuum would be beneficial as that would draw air out of the lens. The actual time though is hard to predict.

**UncleVanya** · 11-09-2021, 08:16 AM

Originally posted by jawats

"Correct" meaning?

Meaning even illumination across the frame, even contrast, etc. Using the lens profile in an appropriate tool to fix each before stacking might help assuming the fix is repeatable and easily applied.

**jawats** · 11-09-2021, 09:26 AM

Originally posted by UncleVanya

Meaning even illumination across the frame, even contrast, etc. Using the lens profile in an appropriate tool to fix each before stacking might help assuming the fix is repeatable and easily applied.

UV,

I'll try using the tool in Adobe RAW - it recognizes the camera lens profile. TY!

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
DA* 60-250 mod for FF - Where to find 3D printed baffle?	chesebert	Pentax SLR Lens Discussion	5	09-03-2020 06:50 AM
For Sale - Sold: Tamron AF 70-200 2.8 (IF) Macro A001, REDUCED 300.00 plus ship. PENDING SALE	tscip22	Sold Items	3	01-20-2020 07:01 PM
For Sale - Sold: Tamron 70-200 f/2.8 Di SP (IF) Macro AF Lens A001	oldbaldclimber	Sold Items	2	04-16-2019 04:51 PM
For Sale - Sold: Tamron 70-200 2.8 IF Macro A001	treebeard	Sold Items	4	10-10-2012 08:01 PM

11-08-2021, 05:08 PM	#16
jawats Site Supporter Join Date: Nov 2017 Photos: Gallery \| Albums Posts: 756 Original Poster	Originally posted by slartibartfast01 Did you include flats when you stacked the images? They should take care of vignetting. I did not. Sequator has some decent correction built in for that. I should probably make some next time. ---------- Post added 11-08-21 at 05:09 PM ---------- Originally posted by UncleVanya Let me point out that if you don’t correct each shot any uneven illumination the differences add up and can increase the effect depending on the method of stacking. "Correct" meaning?

11-08-2021, 05:17 PM	#17
slartibartfast01 Pentaxian Join Date: May 2015 Photos: Gallery Posts: 1,931	Originally posted by jawats I did not. Sequator has some decent correction built in for that. I should probably make some next time. ---------- Post added 11-08-21 at 05:09 PM ---------- "Correct" meaning? Flats are definitely worth trying. They should provide better correction than that built into software since they are produced by your lens.

11-09-2021, 08:10 AM	#18
Bob 256 Site Supporter Join Date: Jun 2008 Location: Idaho Photos: Gallery Posts: 2,378	Originally posted by jawats I'm not sure it's against logic - just against expectations. :P How much time in a bag would you think would be necessary to balance out moisture?[COLOR="Silver"] :P The time would depend on the amount of moisture in the lens and how tightly sealed the lens is. You could speed up the process somewhat by choosing a warmer place to store the lens while you have it bagged with the desiccant. You also might draw out as much air as possible when you zip the bag so the desiccant doesn't have to work on trapped air in the bag. Even a slight vacuum would be beneficial as that would draw air out of the lens. The actual time though is hard to predict.

11-09-2021, 08:16 AM	#19
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,467	Originally posted by jawats "Correct" meaning? Meaning even illumination across the frame, even contrast, etc. Using the lens profile in an appropriate tool to fix each before stacking might help assuming the fix is repeatable and easily applied.

11-09-2021, 09:26 AM	#20
jawats Site Supporter Join Date: Nov 2017 Photos: Gallery \| Albums Posts: 756 Original Poster	Originally posted by UncleVanya Meaning even illumination across the frame, even contrast, etc. Using the lens profile in an appropriate tool to fix each before stacking might help assuming the fix is repeatable and easily applied. UV, I'll try using the tool in Adobe RAW - it recognizes the camera lens profile. TY!