#1  
Old 30-07-2011, 10:14 AM
TheDecepticon
Registered User

TheDecepticon is offline
 
Join Date: Feb 2008
Posts: 1,223
Filter positions

Hi!

I want to get into narrow band, love the colours etc, so I want to use my LRGB 5 position filter wheel.

All good, first three slots will be Ha, SII and OIII. What would be the recommendation for the other 2 slots? Green and Blue, so I can use Ha, G & B to do LRGB style images with Ha,Ha,G,B?

I just wanna cover as much ground with the one wheel so I don't have to buy another wheel and always have to swap stuff around.

Cheers!!
Reply With Quote
  #2  
Old 30-07-2011, 10:49 AM
gbeal
Registered User

gbeal is offline
 
Join Date: Oct 2004
Location: New Zealand
Posts: 4,299
What size filters?
If 1.25" then consider changing the CFW, I used a Starlight wheel which had 7 slots, making, LRGB, plus the 3 N/B all in the one wheel. Very convenient.
Gary
Reply With Quote
  #3  
Old 30-07-2011, 05:08 PM
TheDecepticon
Registered User

TheDecepticon is offline
 
Join Date: Feb 2008
Posts: 1,223
Filters are 2 inch and I do not want to increase the weight, I want to work with what I have.
Reply With Quote
  #4  
Old 30-07-2011, 09:30 PM
jase (Jason)
Registered User

jase is offline
 
Join Date: Sep 2006
Location: Melbourne, Victoria
Posts: 3,916
Hmmm tough call. I think on the 5 position wheel, I would end up going with;

1. Red
2. Green
3. Blue
4. Ha
5. OIII

You'll have fun in collecting Ha and OIII data. SII will test you as its hard to dig for signal on certain targets. I suspect you'll find it difficult to use narrowband Ha as Red to match broadband green and blue filters. Stellar profiles of narrowband data typically yield a much lower FWHM value than broadband.

You might find it easier to swap out the filter wheel carousel as opposed to replace the filter wheel all together. That way you can have a narrowband and broadband set.
Reply With Quote
  #5  
Old 31-07-2011, 08:18 PM
TheDecepticon
Registered User

TheDecepticon is offline
 
Join Date: Feb 2008
Posts: 1,223
Thanks Jase, good info. I'll think on it a bit harder.
Reply With Quote
  #6  
Old 01-08-2011, 08:51 AM
Terry B's Avatar
Terry B
Country living & viewing

Terry B is offline
 
Join Date: Mar 2006
Location: Armidale
Posts: 2,759
The only problem with these combinations is that you are restricted to only imaging bright Ha containing objects. No lum filter for galaxies etc.
I had a similar problem with using photometry filters and colour filters. I eventually got a bigger filter wheel to solve the problem.
Reply With Quote
  #7  
Old 01-08-2011, 09:02 AM
JohnG's Avatar
JohnG (John)
Looking Down From Above

JohnG is offline
 
Join Date: Dec 2005
Location: Cootamundra, NSW
Posts: 1,698
Quote:
Originally Posted by Terry B View Post
The only problem with these combinations is that you are restricted to only imaging bright Ha containing objects. No lum filter for galaxies etc.
I had a similar problem with using photometry filters and colour filters. I eventually got a bigger filter wheel to solve the problem.
That is what I ended up doing, changed from the CFW-8a on the ST2000XM to the CFW-10, loaded up the ClearLRGB and Ha (6 and 12Nm) O111 and S11. Makes it all very easy.

Cheers
Reply With Quote
  #8  
Old 01-08-2011, 09:17 AM
Terry B's Avatar
Terry B
Country living & viewing

Terry B is offline
 
Join Date: Mar 2006
Location: Armidale
Posts: 2,759
Quote:
Originally Posted by JohnG View Post
That is what I ended up doing, changed from the CFW-8a on the ST2000XM to the CFW-10, loaded up the ClearLRGB and Ha (6 and 12Nm) O111 and S11. Makes it all very easy.

Cheers
Yes. I also bought a CFW-10
my filters are BVRIU Lum GR Ha and a star analyser grating.
I can use the photometry B for colour imaging if I need.
Reply With Quote
  #9  
Old 01-08-2011, 09:23 AM
TheDecepticon
Registered User

TheDecepticon is offline
 
Join Date: Feb 2008
Posts: 1,223
Thanks guys.

I have a Moonlite focuser with high res stepper which will carry 8 pounds, according to the specs, so a bigger wheel should be ok, just don't have the money for it at the moment, so I'm trying to cover as much ground as possible with what I have already.

Im only using a 110mm scope, so at the moment, I don't do galaxies. When I move to a bigger scope, I might change filter wheels.

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 02:12 PM.

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