Hi All
I have recently made the switch to N.I.N.A. - and in that process also rebuilt my DARK library.
When I looked over my new 300 sec. master dark made with N.I.N.A. I noticed a, what I believe is a very faint amp glow on the right-hand side of the image.
I thought it was a light leak - check all my other master darks, and notice the same on all of them - growing clearer as the exposure time increased and mostly visible in the stacked final master dark.
Made sure that I test in a completely dark room, with something covering that camera etc. to make sure that there is NO light coming into the camera.
I can find the glow in a single 600 sec. frame as well.
I then checked my old ASIAIR master dark as well - and found it there as well.
Have uploaded both the ASIAIR and N.I.N.A. 300 sec. master dark here: https://drive.google.com/drive/folders/15uA7q9029i0Uk8YklYKOmxQ_uK3_XgiQ?usp=sharing
Has anyone seen something similar?
It's more a coincidence that I notice it - so it has no practical influence on my images.....I think.
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It's normal. The IMX571 keeps glow to a minimum but it isn't Non-existant. The longer the exposure the more it'll show. It'll calibrate out of your light frames easily (not that you'd notice it in a light frame anyway).
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Christian Bennich:
Hi All
I have recently made the switch to N.I.N.A. - and in that process also rebuilt my DARK library.
When I looked over my new 300 sec. master dark made with N.I.N.A. I noticed a, what I believe is a very faint amp glow on the right-hand side of the image.
I thought it was a light leak - check all my other master darks, and notice the same on all of them - growing clearer as the exposure time increased and mostly visible in the stacked final master dark.
Made sure that I test in a completely dark room, with something covering that camera etc. to make sure that there is NO light coming into the camera.
I have the same thing in my ASI2600MM, Christian. I sent photos to ZWO and they said it's normal. (Still looks like amp glow to me, though!) With flats, it honestly doesn't affect processed images.
Greg
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Reg Pratt:
It's normal. The IMX571 keeps glow to a minimum but it isn't Non-existant. The longer the exposure the more it'll show. It'll calibrate out of your light frames easily (not that you'd notice it in a light frame anyway).
Thx @Reg Pratt
I was under the impression that there was no amp glow whatsoever - because I never noticed it before 😃
As I also mentioned - it has had no "real" impact on my images.
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Christian Bennich:
Hi All
I have recently made the switch to N.I.N.A. - and in that process also rebuilt my DARK library.
When I looked over my new 300 sec. master dark made with N.I.N.A. I noticed a, what I believe is a very faint amp glow on the right-hand side of the image.
I thought it was a light leak - check all my other master darks, and notice the same on all of them - growing clearer as the exposure time increased and mostly visible in the stacked final master dark.
Made sure that I test in a completely dark room, with something covering that camera etc. to make sure that there is NO light coming into the camera.
I have the same thing in my ASI2600MM, Christian. I sent photos to ZWO and they said it's normal. (Still looks like amp glow to me, though!) With flats, it honestly doesn't affect processed images.
Greg
Don't you mean "with darks" ?
Well, as you will need darks anyway to fight developping bad pixels, you should not care at all. This simply proves the point that the no-amp-glow is purely marketing argument. Those "amp-glow-free" camera are good cameras, but you will always be better off with darks, and the whole rack of calibration files.
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Every camera produces some amount of thermal glow given the exposure is long enough. People like to say these cameras have zero amp glow but that is factually untrue. I have 3 (zwo, qhy, Altair) and they all have a tiny bit visible in darks once you exceed about 300s of exposure. It won't negatively impact your images at all.
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Christian Bennich:
Hi All
I have recently made the switch to N.I.N.A. - and in that process also rebuilt my DARK library.
When I looked over my new 300 sec. master dark made with N.I.N.A. I noticed a, what I believe is a very faint amp glow on the right-hand side of the image.
I thought it was a light leak - check all my other master darks, and notice the same on all of them - growing clearer as the exposure time increased and mostly visible in the stacked final master dark.
Made sure that I test in a completely dark room, with something covering that camera etc. to make sure that there is NO light coming into the camera.
I have the same thing in my ASI2600MM, Christian. I sent photos to ZWO and they said it's normal. (Still looks like amp glow to me, though!) With flats, it honestly doesn't affect processed images.
Greg
@CingStars, Awesome that you actually sent images to ZWO to get their input 👍
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Christian Bennich:
Hi All
I have recently made the switch to N.I.N.A. - and in that process also rebuilt my DARK library.
When I looked over my new 300 sec. master dark made with N.I.N.A. I noticed a, what I believe is a very faint amp glow on the right-hand side of the image.
I thought it was a light leak - check all my other master darks, and notice the same on all of them - growing clearer as the exposure time increased and mostly visible in the stacked final master dark.
Made sure that I test in a completely dark room, with something covering that camera etc. to make sure that there is NO light coming into the camera.
I have the same thing in my ASI2600MM, Christian. I sent photos to ZWO and they said it's normal. (Still looks like amp glow to me, though!) With flats, it honestly doesn't affect processed images.
Greg
Don't you mean "with darks" ?
Yes, sorry.
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I just checked my 300sec GAIN 100 Master and I can confirm the same. There are two areas on the right side and a constant on the lower edge. However, it is extremely low. I am right between ZWO promised ZERO Glow and it is not ZERO VS it is sooo minimal, that it could be considred as ZERO.
In reality, I never even noticed until you mentioned it, so I agree with ZWO that it can be ignored.
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I’m glad it’s not “just” my camera 😝
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I just checked my Darks and at 300s I have the same effect there. I also checked my dark 30s and 120s but it doesn't show in them.
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Hi Christian, my Darks (300s) also show exactly the same effect.
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Hi Christian,
I just checked all the 300s darks Ive captured for my 2600MM - I might be one of the lucky ones, but there is so sign of amp glow in the darks at all.
Here is a (normalised) master dark.
Don't forget that your screen shots are of a normalised dark, so anything even a few bits brighter than total black will be stretched to look much brighter than it really is. If you look at the average brightness in your dark, it's about the same as the amp glow, so the amp glow will be swamped by the background noise of the sensor.
Try opening the dark without normalising it, and check the histogram - measure the brightness value in the amp glow regions, it will be very close to 0, 0, 0.
As others have said, the impact will be immeasurably small if your lights are well calibrated.
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Seeing the same thing in my 2600MM, 300s dark @-15C. Never noticed this until you mentioned. Have not seen any residuals in my master lights so not problem  . CS! |
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Need to test my IMX571 then [non ZWO] to see if i have the same issue or not, thank you.
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Mine at -15C 900s gain=100 |
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I began with a 294mc so I learned to calibrate because you absolutely have to.... I have the 2600mc and the 2600mm and I still calibrate because you Need to.
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Just to add my experiences, I have the 2600MC Pro and just stretched my master 300sec dark taken at -10c.
I have the same very minor amp glow to the right of the frame. As some others have mentioned, never noticed it until now.
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Yep. Normal. Part of what makes it show up so noticeably is how the calibration frames are stretched for preview. Because the sensor is quite low noise, many stretching algorithms will do a good job of bringing up that amp glow with an autostretch of sorts, when it is actually so faint that you likely wouldn’t have noticed it in an uncalibrated stack anyhow.
Attached is a 50% JPG 100% quality compressed preview of a 600s 100g -10°C masterdark from my 2600MM Pro. You can see similar amp glow on the right-hand side, and you can also see two other extreme characteristics of this sensor: some blooming around certain pixels, and a hint of vertical banding. All of this stuff is so faint that it is virtually irrelevant to the image anyhow, but nice all the same to have it represented in calibration frames. I’d wager if even a hint of light snuck in to the calibration frames a lot of this stuff wouldn’t turn up in a typical auto-stretch, and folks probably frequently miss how easy it is for that to happen.
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I took a new set of master darks with my ASI2600MM PRO using the gain 100 offset 50 setting and I get the same bright band showing in my longer masters- faint in the 300 second exposures and very visible, like yours, in the 600 second exposures.
I suspect that this must be a bit of amp glow and provided the darks calibrate correctly this should not be of concern. It is possible that it is never possible to fully eliminate amp glow however it only shows in long exposures.
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So if all cameras must show amp glow even very slightly and must be corrected with dark frames, then what camera can be the best? It sounds no CMOS camera matched CCD in regard of free amp glow maybe?!!!
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Christian Bennich:
Hi All
I have recently made the switch to N.I.N.A. - and in that process also rebuilt my DARK library.
When I looked over my new 300 sec. master dark made with N.I.N.A. I noticed a, what I believe is a very faint amp glow on the right-hand side of the image.
I thought it was a light leak - check all my other master darks, and notice the same on all of them - growing clearer as the exposure time increased and mostly visible in the stacked final master dark.
Made sure that I test in a completely dark room, with something covering that camera etc. to make sure that there is NO light coming into the camera.
I can find the glow in a single 600 sec. frame as well.
I then checked my old ASIAIR master dark as well - and found it there as well.
Have uploaded both the ASIAIR and N.I.N.A. 300 sec. master dark here: https://drive.google.com/drive/folders/15uA7q9029i0Uk8YklYKOmxQ_uK3_XgiQ?usp=sharing
Has anyone seen something similar?
It's more a coincidence that I notice it - so it has no practical influence on my images.....I think.
Im seeing this in my 600s master darks as well
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2.81
8.52
1.43
3.61
0.00
0.00
0.00
5.77
1.81
2.94
0.00
5.63
2.86
2.11
2.41
0.90
