Issue with Flats

[spaceman_spiff]

I was quite shocked at the difference it made - something to do with the DSLR sensor needing time to fully remove accumulated charge taken in the previous photograph.

Here's a link to the thread with my flat problem.

Dan

[JohnSadlerAstro]

Hi,

I just found something very startling out--we'll see if it makes any difference to the stacked image.....

John

[JohnSadlerAstro]

Hi,

Using more darks has helped, but I will have to wait for it to get dark so I can take them properly--they were behaving very strangely!

John

[geordie85]

1 hour ago, JohnSadlerAstro said:

Hi,

Yes, I did manage to solve the issue (sort of) with IRIS, (The image is above) I am doing a new set of calibration frames, with more darks and then I will follow your advice for taking the flats . I would like to resolve the gradient this way, as IRIS added lots of noise though seeing as I'm using only 10 mins total data that isn't very surprising.

John

https://www.google.com/nikcollection/ I use this for noise reduction. It's amazingly good, and the best part is its free 

[spillage]

2 hours ago, JohnSadlerAstro said:

Hi,

Using more darks has helped, but I will have to wait for it to get dark so I can take them properly--they were behaving very strangely!

John

Next chance you get (all the best of luck) take you darks at the same time as your subs so they are the same temp and at the same exposure times and iso.