First try at M27

[raymo]

Been wanting to have a go at this for a while. Needs more subs. I was experimenting, so odd arrangement of sub lengths.
5 x 45 secs, 1 x 60, 1 x 75, 1 x 90, and 1 x 120. All at 1600 ISO
8" f/5 Newt, 1100D.
raymo

[Rex]

Raymo you amaze me with every image you put up, the amount of detail you can bring out with such short subs is astounding. Great job of a nice object. If this is just experimenting I can't wait to see what the finished product looks like.

[Camelopardalis]

+1 echo that, well done :thumbsup: I always need way more subs for the same low noise!

[raymo]

Thanks Rex and Dunk. This target is particularly difficult for me, as it is
in view between trees for only about an hour and a half, and is only
about 30 degrees alt. It's too hard for me to take all my gear elsewhere
very often. I'll just have to take a lot of 120 secs subs over several nights. I processed this post too quickly; I'll have another go at it today
Dunk, you say that you need more subs to get rid of noise. You have the same camera as me. Maybe the difference is related in some way to the fact that you, I believe, moved on to taking separate darks etc. Also, until my PS astronomy book
arrives, and I learn something from it, I am still using only DSS for what little processing I do.
raymo

[Camelopardalis]

It's pretty bright, all things considered, so I reckon you'd make short work of it during your window(s) of opportunity raymo, look forward to the fruits of your labour :thumbsup:

I'm experimenting with my process, but Jorge mentioned recently about bias files introducing noise, so I'm going to try without them once I've got some more data. Other than that, maybe my sensor is just noisier, or I'm overlooking what little data I've got :D

[raymo]

Every AP book I have [4], states that biases are totally unnecessary, and can even be detrimental, unless you are scaling darks that don't match
your lights.
raymo

[LightningNZ]

Raymo - that still implies that you have a sufficient number of dark images. Remember that 10 of anything is hardly a decent sample size.

[raymo]

I don't fully understand your post Cam. I normally use 50 or so subs, and as my noise reduction is enabled, 50 or so darks are used. I am still in first gear in AP, and don't use separate darks, flats, or biases, so biases don't actually concern me directly as yet.
raymo

[LightningNZ]

Ignore my post then Raymo - I always forget that you're not doing the (RAW-DARK-BIAS)/(FLAT-BIAS) thing.

[raymo]

No worries, no doubt I'll get there one day.
cheer raymo

[rustigsmed]

awesome work Raymo, I didn't realise that you were only using DSS for processing - I tried that about 2 times then gave up!

you will definitely get waaay better results when you get the hang of photoshop - it gives you a lot more control of the image. you're going to have to go back and re-process all your old images!

cheers,

rusty

[raymo]

Thanks Rusty. I do have the antique PS7, but can't make head or tail of most of it. All I use it for is downsizing. I have the book Photoshop
Astronomy coming soon, so maybe after studying that for several years
I'll be able to dive in and give it a go.:lol:
raymo

[LightningNZ]

Raymo, have you seen Louie's excellent astro processing tutorials for photoshop on youtube? https://www.youtube.com/channel/UCJ5b6pFHBGe66vsuSaXb-0A

They're great.

[raymo]

Hi Cam, thanks for the link. I have tried some of them, but I can't
remember well enough. I need a page open in front of me whilst I
familiarise myself with any given procedure, which is why I have ordered the book and DVD.
raymo