#1  
Old 21-05-2014, 08:21 AM
Andy01's Avatar
Andy01 (Andy)
My God it's full of stars

Andy01 is offline
 
Join Date: Mar 2012
Location: Melbourne
Posts: 2,280
Ha filter for OSC CCD

Hi everyone,

I realize this is best done on a mono camera, but until the finance minister approves that i'd like to get an Ha filter to do some HaRGB blended images.

I have a 42mm threaded IDAS LP filter that screws into either the SBIG 8300c nosepiece or the end of my flattener/reducer and works well from my light polluted backyard. I'm planning on swapping it out to do the ha subs.

Any recommendations for brands? Baader, Astrodon? Do the big bucks make a real difference? Will a 7nm be sufficient or overkill?

Appreciate your input.
Cheers
Andy
Reply With Quote
  #2  
Old 21-05-2014, 10:48 AM
garymck (Gary)
Registered User

garymck is offline
 
Join Date: Aug 2005
Location: Geelong
Posts: 682
I happily used a Baader 7nm filter for this shot using a QHY8 OSC ccd

http://www.iceinspace.com.au/forum/a...chmentid=71919

Worked fine for me....

cheers
Gary
Reply With Quote
  #3  
Old 21-05-2014, 04:44 PM
White Rabbit's Avatar
White Rabbit
Space Cadet

White Rabbit is offline
 
Join Date: Feb 2007
Location: Sydney
Posts: 1,409
Hi have the 6nm Astronomik Ha filter and I'm blown away but the contrast I get with it. I'm using an STF-8300m.
I'd get as narrow as you can afford, it will have better light rejection and contrast.

https://www.flickr.com/photos/sandy073/9634651496/

Cheers.
Reply With Quote
  #4  
Old 22-05-2014, 12:58 AM
MrB's Avatar
MrB (Simon)
Old Man Yells at Cloud

MrB is offline
 
Join Date: Jan 2007
Location: Rockingham WA
Posts: 3,408
This was shot with an Astronomic 12nm Ha and a Canon:
http://www.astrobin.com/90125/
Reply With Quote
  #5  
Old 22-05-2014, 09:45 AM
blink138's Avatar
blink138 (Pat)
Registered User

blink138 is offline
 
Join Date: Aug 2009
Location: perth w.a.
Posts: 2,226
how do you add ha to a normal rgb fron a dslr in dss?
pat
Reply With Quote
  #6  
Old 22-05-2014, 12:01 PM
Andy01's Avatar
Andy01 (Andy)
My God it's full of stars

Andy01 is offline
 
Join Date: Mar 2012
Location: Melbourne
Posts: 2,280
Quote:
Originally Posted by garymck View Post
I happily used a Baader 7nm filter for this shot using a QHY8 OSC ccd

http://www.iceinspace.com.au/forum/a...chmentid=71919

Worked fine for me....

cheers
Gary
Nice one! Do you recall your sub exposure times for that shot?

Quote:
Originally Posted by White Rabbit View Post
Hi have the 6nm Astronomik Ha filter and I'm blown away but the contrast I get with it. I'm using an STF-8300m.
I'd get as narrow as you can afford, it will have better light rejection and contrast.

https://www.flickr.com/photos/sandy073/9634651496/

Cheers.
Good advice, your M8 shot is awesome, what length of subs were they on the mono camera? cheers

Quote:
Originally Posted by MrB View Post
This was shot with an Astronomic 12nm Ha and a Canon:
http://www.astrobin.com/90125/
Cool, that's a lot of detail from 12nm Ha, you should be happy with that

Quote:
Originally Posted by blink138 View Post
how do you add ha to a normal rgb fron a dslr in dss?
pat
if I understand this correctly, you stack and process the Ha and RGB subs separately, then use the red channel from the ha image when merging the RGB image in PS.

http://starizona.com/acb/ccd/software/ps_hargb.aspx????

Thanks for your input folks, does anyone have examples of HaRGB merged images from their OSC or DSLR to show?

Cheers

Andy
Reply With Quote
  #7  
Old 22-05-2014, 12:21 PM
garymck (Gary)
Registered User

garymck is offline
 
Join Date: Aug 2005
Location: Geelong
Posts: 682
[QUOTE=Andy01;1084858]Nice one! Do you recall your sub exposure times for that shot?


15x5mins
GSO 8" f4 Newt
QHY8 OSC ccd
Baader MPCC
Baader 7nm filter
Guided by Qguide and 100mm f5 Skywatcher achromat

cheers
Gary
Reply With Quote
  #8  
Old 22-05-2014, 12:23 PM
MrB's Avatar
MrB (Simon)
Old Man Yells at Cloud

MrB is offline
 
Join Date: Jan 2007
Location: Rockingham WA
Posts: 3,408
Quote:
Originally Posted by Andy01 View Post
Cool, that's a lot of detail from 12nm Ha, you should be happy with that
Cheers
It was only a test shot to see how the 12nm would fare with 10min subs in heavy suburban and industrial light pollution and an almost full moon, I think it passed the test

Time to get serious with it after I adjust the flattener spacing and correct the focuser tilt.... If only the clouds would bugger off!
Reply With Quote
  #9  
Old 22-05-2014, 03:34 PM
White Rabbit's Avatar
White Rabbit
Space Cadet

White Rabbit is offline
 
Join Date: Feb 2007
Location: Sydney
Posts: 1,409
Hi Andy

They were 10 min subs, lots of them. I think from memory about 8 hrs worth..
Reply With Quote
  #10  
Old 22-05-2014, 05:56 PM
Bassnut's Avatar
Bassnut (Fred)
Narrowfield rules!

Bassnut is offline
 
Join Date: Nov 2006
Location: Sydney
Posts: 4,772
Quote:
Originally Posted by White Rabbit View Post
Hi have the 6nm Astronomik Ha filter and I'm blown away but the contrast I get with it. I'm using an STF-8300m.
I'd get as narrow as you can afford, it will have better light rejection and contrast.

https://www.flickr.com/photos/sandy073/9634651496/

Cheers.
Dont go too tight (3nm) or you will exclude N11, a mistake I made although 3nm gives the best Ha detail. min 6-7 min is fine and gives more signal.
Reply With Quote
  #11  
Old 22-05-2014, 06:39 PM
LewisM
Novichok test rabbit

LewisM is offline
 
Join Date: Aug 2012
Location: Somewhere in the cosmos...
Posts: 9,326
I use Prostar 2" H-a and an IDAS LP on my Atik 4000 OSC with a custom made 2" holder/spacer.

Just need to extract the red channel from the H-a subs and layer them on the RGB debayered subs. Works fine.

Craig Stark wrote a good article on NB line work with an OSC, as did Starizona.
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 08:12 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Advertisement
Lunatico Astronomical
Advertisement
Bintel
Advertisement
NexDome Observatories
Advertisement
SkyWatcher Australia
Advertisement
OzScopes Authorised Dealer
Advertisement
Meade Australia
Advertisement
Celestron Australia
Advertisement
Astronomy and Electronics Centre
Advertisement