simmo39

4 hours ago, MarkAR said:

Astroboot.co.uk might have something.

Thanks swill look there

4 hours ago, Oldfort said:

This company may have what you want.  The website has changed completely since I used it last, but worth a look.

 

https://greentree-eng.co.uk/product/product-protection-finishing

I will have a look thank you.

Hi, I am struggeling to find the right place for this so if it is in the wrong place feel free to move to the right thread. Know to the question. I have fitted a M 48 thread to my scope tube whitch i use to attache a FF  with a M 48 thread. To save keep taking all the bits off my scope Im looking for end caps the fit both items ( 1 female and 1 male ) I have looked all over the net and the only thing I can find is DLSR covers for camer bodys at rediculous prices. Can anybody point me in the right direction to get some?

Thanks and stay safe

Simmo

V nice m8. Long time no see.

Sorry vlaiv, cant seem to get the fits to upload, PNG and jpeg works fine. 

1 hour ago, vlaiv said:

Ah, sorry, I should have been more specific. I wanted to suggest you to upload original .fits straight from camera so I can check actual pixel values and do some statistics with the data.

Scaled down jpegs are of no use for that purpose.

yep, I tried to upload the fits but i keep getting an error, i will keep trying. I think the net is heavy with traffic.

I know it has problems and its the wrong scope for the job but clear sky is clear sky! Vlaiv is looking into the poor backgrond problem, not sure if its a flat problem or internal relections but it is what it is.

Taken with ASI 1600mm through SW 72 ed  ( wrong scope for the job ) about 5hrs RGB over 4 nights.

Hints tips and problem solving welcome.

Thanks for looking

17 minutes ago, vlaiv said:

Could you post following:

1. light sub

2. dark sub (or master dark)

3. flat sub

4. flat dark sub

(or bias if that is what you are using instead of flat dark)

Flat dark sub

Master dark

Single flat sub

Single light sub

Hope they are ok, had to play around a little with them to load.

1 minute ago, vlaiv said:

Could you post following:

1. light sub

2. dark sub (or master dark)

3. flat sub

4. flat dark sub

(or bias if that is what you are using instead of flat dark)

Yep will do that in a bit.

19 hours ago, Anthonyexmouth said:

I'll be watching for the answer to this myself, been using APT for my flats too and maybe it's time to try a new method. 

Hi Anthony, not sure if i have solved the problem but looks better. It was all guess work Im afraid so no cunning plan to tell.

18 hours ago, vlaiv said:

You need to "guess" it - by looking at histogram. It needs to be to the right but it must not clip in any of the colors (there will be three peaks and all should be visible and not clipped to the right). Once you find exposure length that works - shoot flats with that exposure length and remember it. Then shoot flat darks with same exposure length.

Hi vlaiv. Well i tried last night with my best guess and it did come out a little better, Still not 100% right but I think Im heading in the right direction. It didnt help that my framing was way out with my other subs but at least I feel im getting somewhere. I still wonder aslo about internal reflections but not sure how to best sort that.

If you look close you can still see the swirls but not half as bad as what it was.

1 minute ago, vlaiv said:

I've seen on numerous occasions that people have issues with APT and automatic flats. Could be that it is issue with flats.

How about doing flats "manually"? Avoid any automatic procedure for flat creation and just shoot regular "light" subs with flat panel and stack those yourself to see if it will help?

WEll ill give that a try tonite and see what I get. The only thing Im not to sure of is the actule sub length to us for the flats. I have read all the thearoy stuff on flats and I have to say a lot of it is over my head but will give it a try.

1 hour ago, vlaiv said:

This looks like high altitude clouds rather than anything else.

You can check if it is by doing a trick - split subs into two groups - stack each group as it was whole session (you can do this with only one channel if you did LRGB imaging) - compare two resulting stacks for this pattern. If pattern is the same - it is camera related, if it's not the same - it varies with time and it is probably external - most likely high altitude clouds.

You can even inspect how many of the frames are impacted - calibrate them and bin them like crazy (so you get very small size - something like 320x240 or so) - this will boost SNR of each sub so you'll be able to see all of the features in each sub. Do same stretch on each and make animated gif out of it - it will show passing clouds if this was in fact what caused issue in the first place.

Hi Vlaiv, I have done something like you sugest. The rgb subs where taken on seperate nights and the patern is the same for all 3 sets of subs. The only improvment i got was on the third night doing green when I increased the ADU of the flats in APT from 20000 to 25000. The patturn was still there but less prononced. Thats why im wondering if its a flats problem. Im using a gain of 76 on my ASI 1600mm for the subs whitch is new for me as I have been using 200 for narrow band would that have any bearing?

Hi all. Not sure where Im supposed to post this one so If im in the wrong place I sorry. Now to the problem: As it gallaxy season ( not my fav time of year ) I thought I would give the Leo trip ago using my SW 72 ed. I know is not the scope for this target but I was just playing and trying to get my head around RGB imaging. I have had some good results with my set up in narrow band but RGB is giving me real problems. Im not sure wheather its my flats or internal reflections or just to long subs but im getting greenish swiirls in my images on all 3 filters ( less so on the green ). I can remove some of it with masks and ABE / DBE in pixinsight but there is still a stubborn section that is always there. Here is the rgb image after combination and a stretch;

Im happy with the targits but the bacground is driving me up the wall. Any ideas on whats wrong or how I can get rid of the haze?

Thanks i advance.

Simmo

Nice one Geof. Looks great as is to me.

1 hour ago, Jkulin said:

No I use a magenta removal script in PI which works very nicely using pixelmaths, if you use PI then just add this as a process icon and it does it instantly.

I've attached the file.

Magenta Removal.xpsm 2.02 kB · 1 download

Thanks I will give it ago.

6 hours ago, assouptro said:

That’s a lovely rendition of one of my favourite DSO’s 

thanks for sharing 

Bryan 

Thank you Bryan.

3 hours ago, Martin-Devon said:

That's a fabulous image, colours and processing are top drawer, well done.

You are very kind, thank you.

4 hours ago, Gina said:

Very nice indeed! 

Thanks Gina.

4 hours ago, MarkAR said:

Lovely image even with the poor data. There will always be another chance for better Oiii and Sii data.

Thanks Mark, yes there will but when? lol the weather has been so poor this year.

1 hour ago, Jkulin said:

Lovely Capture but just a bit too magenta for my liking, so I bunged it into PI and I think this enhances your image: -

Thank you, that look better, Did you use the mask script in PI?

V nice.

19 minutes ago, Adreneline said:

Very nice! Looks amazing to my eyes - love the colours - not too overstated.

Adrian

Thank you, I find it hard sometimes to not over stretch things.

Why is this game so hard! 2 storms, rain, wind, tech problems and more rain and wind! This was meant to be a quick one but ended up a real long job. Ha data was v good but the Oiii and Sii was very poor. I would not have used half the data if I could get chance to redo it but as it was I wasnt going to waste what I had. 

60 x 240 Ha      58 x 240 Oii      49 x Sii      all taken with Zwo 1600 mm through SW 72ed

I always seem to have problems with not seeing green so i tried to get brid of as much as i could see. 

Any hints and tips most welcome and thanks for looking.

V nice, I must try and get one of these lenses, getting past the wife is a problem though!

Still a nice shot!