M33 gradient ?

[BlueAstra]

Early days in imaging, but I had a go at M33 last Friday. 14x240s subs and 3 darks. After a couple of curve 'boosts' in PS I noticed the right side of the image seemed to be brighter than the left side. I've not gone through all the subs yet, but can anyone explain this?

[Aza]

I get this when imaging certain parts of the sky from home.

It is a light leak.

Do you have any street lamps in that direction.

They dont even have to be that close, a small amount of light can cause big problems.

Or if the light is from 'behind' you should block up the viewfinder.

[BlueAstra]

I guess its possible. There is a street light in that general direction. However, I am pointing up at about 70 deg, and I do have a long dew shield on. Doesn't the mirror lock up block the viewfinder?

[malp]

I have to deal with gradients like this all the time, mine caused by light pollution and dewy atmosphere. GradientXterminator will completely eradicate it, I ran your jpeg through just once, see attached.

[BlueAstra]

Fantastic. I'm off to the shops now for my copy!

[glennbech]

You can also do "Dynamic Background Extraction" in PixInsight LE (Free download).The process there is a bit more cumbesome and complicated, but you'll get the same results...