Rosette Nebula with Williams Optics GT81

[ched]

Hello all

This is my first proper DSO taken with the GT since I got it around christmas. It was built from 16 x 4 min subs, 5 darks, 11 flats and 11 bias frames, stacked in DSS and tweaked in PS.

My CGEM was guided using my main telescope ( Celestron EdgeHD 9.25" ) with a QHY5 and PHD. I am pretty new to all this and it is my first attempt at such a large object. It was taken 18/03/12.

There is a colour gradient in the bottom left of the image which I put down to a street light about 40 yards away, however looking at some of the other Rosette images posted on here they appear to exhibit a similar tinge. I wondered if anyone could explain what this is caused by .......... other than clumsy processing

Anyway, thank you for looking

[SteveT]

Hi,

What camera did you use and did you use any filters?

Sent from my iPad using Tapatalk HD

[ched]

My apologies, it is a Canon 350D with the AP mod and I just have an Astronomik CLS filter in place.

[SteveT]

That's a good image, I have a self modded 350d, with the Baader filter in place, does your cam just have the filter removed?

Sent from my iPad

[ched]

woahh...brave man !!

I actually got it second hand but I believe it has the Baader filter inserted