A Reprocess of a DSLR Capture

[lensman57]

Hi,

This is a reprocess of the M31 capture of the last week. WO ZS71 @F4.7 , Canon 1100d unmodded, Idas P2 filter.

Regards,

A.G

[Raga]

Nice image with an unmodded canon. Well done.

[todd8137]

It as a few problems that could be ironed out and edited out but you have some nice detail,,what subs time lenght ect?

[lensman57]

It as a few problems that could be ironed out and edited out but you have some nice detail,,what subs time lenght ect?

Hi,

Thanks, it was a stack of 30X 150s . It was a little noisy but I didn't push the moise reduction too much.

A.G

[lensman57]

Hi,

Here is the same image with the background sky equalised, some very faint detail has been lost but the dust are still showing reasonably well. When is this horrible weather going to let us back to imaging?

A.G

[PhotoGav]

Better clouds at full moon than new moon....!

[PhotoGav]

Great image. Did you shoot darks too? It does look pretty noisy? Good job on the background - you have made a massive improvement to it which let's the galaxy really stand out.

[lensman57]

Hi Gav,

Yes I did shoot darks, but I have a feeling that they made the image worse since the darks were shot at a much higher sensor temperature than the image was taken at, that is one of the disadvantages of a DSLR compared to a cooled CCD.The image is also savagely stretched for the little data that was collected, subs of 150s with a DSLR do not give the best signal.

Many thanks,

A.G

[todd8137]

With my 10d/600 d I shoot 5,and 8 min subs ,wrong or right I always shoot my dark frames half way through the run ,and then finish my light frames works for me do you not have darks on stock ?with the same ISO ect I keep all mine and put a little file in there with temps and all the rest ?

Pat

[lensman57]

With my 10d/600 d I shoot 5,and 8 min subs ,wrong or right I always shoot my dark frames half way through the run ,and then finish my light frames works for me do you not have darks on stock ?with the same ISO ect I keep all mine and put a little file in there with temps and all the rest ?

Pat

Hi Pat,

I dont use the DSLR anymore unless I need to do ultra wide field as in M31, most of my stock of darks are nearly 6 months old now and were done last MApril when the temp was still quite low,one was done on one of those muggy humid nights  about two weeks ago. I am now convinced that I have to live withnoise even in CCD captures as my sky quality is really very poor.

Regards,

A.G

[Pete Presland]

that is a pretty good image, some nice deatail and star colour. what ISO setting did you use, perhaps you could reduce the setting next time to help?

[lensman57]

that is a pretty good image, some nice deatail and star colour. what ISO setting did you use, perhaps you could reduce the setting next time to help?

Hi,

I used my unmodded 1100d @ iso 1600, perhaps  next time I just stick to 400 and give it a bit more time . I think the DSLR is done a decent job with such short exposures.

Regards,

A.G