Is this amp glow?

[feverdreamer1]

Hi, trying to process some M45 data. It's 2hr and 47 min approximately, taken with unmodded 550D, star adventurer, in a bortle 8. I'm processing in StarTools,  if that helps.

So, is this amp glow? How do I get rid of it?

If also someone wants to have a go at my data, let me know!

[feverdreamer1]

Oh, and 10 darks for calibration

 

[speckofdust]

what telescope are you using? Looks like a collimation issue to me.

[feverdreamer1]

16 minutes ago, speckofdust said:

what telescope are you using? Looks like a collimation issue to me.

No telescope, camera lens. Stock 55-250mm IS.

[almcl]

If you haven't started using flats, you may find they help? 

And darks on an uncooled camera may introduce more noise than they suppress. 

There is a more up-to-date version of StarTools available (1.7.440 at the moment) and the new wipe module may be able to help if you try the vignetting preset.

[feverdreamer1]

24 minutes ago, almcl said:

If you haven't started using flats, you may find they help? 

And darks on an uncooled camera may introduce more noise than they suppress. 

There is a more up-to-date version of StarTools available (1.7.440 at the moment) and the new wipe module may be able to help if you try the vignetting preset.

Yes, I should try and take them, but it seems kinda complicated. Do you have any guide/can you refer me to any good information on how to take flats?

Will install that updated StarTools version, thanks for letting me know!

 

[almcl]

2 hours ago, feverdreamer1 said:

Yes, I should try and take them, but it seems kinda complicated. Do you have any guide/can you refer me to any good information on how to take flats?

There's lots of info on flats both here and on-line.  One simple guide (if you are using Deep Sky Stacker) is on the page here

http://deepskystacker.free.fr/english/faq.htm

Once you get used to doing them it only takes a couple of minutes.

[Adam J]

On 08/11/2020 at 14:18, feverdreamer1 said:

Hi, trying to process some M45 data. It's 2hr and 47 min approximately, taken with unmodded 550D, star adventurer, in a bortle 8. I'm processing in StarTools,  if that helps.

So, is this amp glow? How do I get rid of it?

If also someone wants to have a go at my data, let me know!

 

No its not amp glow there isnt really any on a 550D.

Looks like vignetting to me, off centre to you have droop or colimation issues, what telescope and filters are you using?

The answer is to take flats btw.

Adam

 

[rnobleeddy]

Not really adding a lot to this, but I have a couple of similar DSLRs and haven't seen that kind of gradient show up so I doubt it's camera related.

But the #1 solution is to take flats. Whilst others will suggest more robust methods, I've found a piece of white paper across an old tablet screen, which us displaying a full screen white jpg,  works wonders. 

[Budgie1]

11 hours ago, rnobleeddy said:

Not really adding a lot to this, but I have a couple of similar DSLRs and haven't seen that kind of gradient show up so I doubt it's camera related.

But the #1 solution is to take flats. Whilst others will suggest more robust methods, I've found a piece of white paper across an old tablet screen, which us displaying a full screen white jpg,  works wonders. 

Likewise, I use a blank MS Word document on my PC screen and a double layer of a white T-shirt over the scope tube, held in place with a rubber band.

Set the DLSR on AV mode and hold the scope against the screen.

When I first started I was using a single lay white T-shirt but it let too much light in, so the exposure was too short and the mirror was causing a shadow at the top of the flats, but a double layer seems to work well.