#1  
Old 29-08-2013, 12:56 PM
h0ughy's Avatar
h0ughy (David)
DOGHOUSE REBORN

h0ughy is offline
 
Join Date: Apr 2005
Location: NEWCASTLE NSW Australia
Posts: 30,586
Filters

Looking at the world of imaging filters itís an eye opener for such a narrow view of the world. While looking into the world of mono, it struck me what do I get?

I will be upfront and say if you were looking at getting a complete filter set on a budget what would you choose Ė letís say you had a 10 spot filter wheel? What would you fill it with?
Reply With Quote
  #2  
Old 29-08-2013, 03:12 PM
multiweb's Avatar
multiweb (Marc)
ze frogginator

multiweb is offline
 
Join Date: Oct 2007
Location: Hinchinbrook
Posts: 18,150
Baader Ha, Oiii, Nii, Sii, IR, Lum, Red, Green, Blue, UV/IR block.
Reply With Quote
  #3  
Old 29-08-2013, 03:56 PM
Terry B's Avatar
Terry B
Country living & viewing

Terry B is offline
 
Join Date: Mar 2006
Location: Armidale
Posts: 2,759
What do you want to image?

I have L R G B Ha B V R I

I'm not interested in narrow band as I have no light pollution. I do like photometry though hence the photometry filters.
Reply With Quote
  #4  
Old 29-08-2013, 04:04 PM
Bassnut's Avatar
Bassnut (Fred)
Narrowfield rules!

Bassnut is offline
 
Join Date: Nov 2006
Location: Sydney
Posts: 4,771
Quote:
Originally Posted by multiweb View Post
Baader Ha, Oiii, Nii, Sii, IR, Lum, Red, Green, Blue, UV/IR block.
Ditto, good choice.........except Astrodon
Reply With Quote
  #5  
Old 29-08-2013, 07:26 PM
h0ughy's Avatar
h0ughy (David)
DOGHOUSE REBORN

h0ughy is offline
 
Join Date: Apr 2005
Location: NEWCASTLE NSW Australia
Posts: 30,586
so what is NII used for?
Reply With Quote
  #6  
Old 29-08-2013, 07:45 PM
RickS's Avatar
RickS (Rick)
PI cult recruiter

RickS is offline
 
Join Date: Apr 2010
Location: Brisbane
Posts: 10,582
Quote:
Originally Posted by h0ughy View Post
so what is NII used for?
http://www.astrodon.com/Orphan/astro...arrowband/#h15
Reply With Quote
  #7  
Old 29-08-2013, 07:48 PM
mithrandir's Avatar
mithrandir (Andrew)
Registered User

mithrandir is offline
 
Join Date: Jan 2009
Location: Glenhaven
Posts: 4,161
Quote:
Originally Posted by h0ughy View Post
so what is NII used for?
http://www.astrodon.com/Orphan/astro...arrowband/#h15

Rick beat me by seconds.
Reply With Quote
  #8  
Old 29-08-2013, 07:53 PM
RickS's Avatar
RickS (Rick)
PI cult recruiter

RickS is offline
 
Join Date: Apr 2010
Location: Brisbane
Posts: 10,582
Sorry, Andrew. It's usually me that's too late
Reply With Quote
  #9  
Old 29-08-2013, 09:40 PM
gregbradley's Avatar
gregbradley
Registered User

gregbradley is offline
 
Join Date: Feb 2006
Location: Sydney
Posts: 15,410
I used both Baader, Astronomiks and Astrodon (Gen 1 and Gen 2).

I prefer the Astrodons as they are easier to get balanced colour and quite parfocal (within reason).
Baaders are quite good and have very good red response, are less parfocal despite the claim and I had a 7nm Ha filter which was defective. I have some Astronomiks and they have good colour balance, are cheaper, thinner (they need spacers to fit in filter wheels) and I found they gave good star colours.

So any of those 3, I think are good. Astronomiks are the cheapest I think. Mike S uses Astronomiks.

You can get great results from any of them. Astronomiks are the cheapest.

Greg.
Reply With Quote
  #10  
Old 30-08-2013, 06:04 AM
PRejto's Avatar
PRejto (Peter)
Registered User

PRejto is offline
 
Join Date: Jan 2011
Location: Sydney, Australia
Posts: 1,290
Well, I'm just going through this exercise myself and I'm going with Baader as a compromise.

First, I think the lum filter Baader offers is IR blocking (which in my case is essential for a refractor). The narrow band filters also seem to be a compromise in bandwidth compared to Astronomiks (wide) and Astrodon (quite narrow), and price wise fall into a somewhat middle ground which also makes sense. It didn't hurt that there are some beautiful test photos using a TEC140 with Baader either.)

But, my main reason for going this way over Astronomik is the slight notch between Red/Green to deal with Sodium light pollution which the Astronomik's don't have. The Astrodon filters have this notch (larger!) as well but cost much more. I plan to try either a Hutech or Astronimik CLS light Pollution filter in place of the luminance filter. This combination of filters might provide a reasonable light pollution combination but does not address Mercury LP...

I have tentatively compared both Hutech and Astronomik LP filters using a light box...perhaps not a fair way to compare. Compared to using no filter at all the Hutech takes 2X the exposure length to reach the same adu, the CLS 3.4X (big surprise!)

Peter
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 04:22 PM.

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