ZWO ASI 1600MM-Pro - white 'vignetting' on my dark frames - what is it?

[SiD the Turtle]

I've had this camera a few years now and it's always had the same problem, if it is a problem. Here's a stretched 180s dark frame, no stacking, processing etc. apart from auto stretch:

This is with the camera disconnected from the image train, lens cap on and in a cardboard box with the gaps taped up (for testing, obviously this isn't great for cooling long term), in a room with the lights off in the middle of the night!

I haven't seen it impacting my imaging, but I'm curious as to what it is. Doesn't look like amp glow.

Any ideas?

 

[andrew s]

2 minutes ago, SiD the Turtle said:

I haven't seen it impacting my imaging, but I'm curious as to what it is. Doesn't look like amp glow.

But, that us what it is in my view. Look at this.

Regards Andrew 

[vlaiv]

3 minutes ago, SiD the Turtle said:

Doesn't look like amp glow.

Doesn't look like one - but it is one.

It calibrates out though, so nothing to worry about - just use matching darks.

[SiD the Turtle]

Thanks both, I had dismissed amp glow on the basis it's doesn't look like the common examples you see online. As you say, it doesn't seem to impact my images so I will continue on!

[Clarkey]

Looks very much like the amp glow on my 1600mm pro, but slightly more balanced. As said, if it calibrates out - don't worry about it🙂

[Adam J]

On 17/08/2023 at 12:57, SiD the Turtle said:

I've had this camera a few years now and it's always had the same problem, if it is a problem. Here's a stretched 180s dark frame, no stacking, processing etc. apart from auto stretch:

This is with the camera disconnected from the image train, lens cap on and in a cardboard box with the gaps taped up (for testing, obviously this isn't great for cooling long term), in a room with the lights off in the middle of the night!

I haven't seen it impacting my imaging, but I'm curious as to what it is. Doesn't look like amp glow.

Any ideas?

 

it's amp glow and totally normal.