#1  
Old 04-01-2012, 01:56 PM
naskies's Avatar
naskies (Dave)
Registered User

naskies is offline
 
Join Date: Jul 2011
Location: Brisbane
Posts: 1,865
Atik 383L+ and Astrodon filters - thoughts?

After shooting last month's lunar eclipse, chasing Lovejoy, and shooting wide fields and star gazing under extremely dark (~ 22 mag/sq arc-sec) skies, I think I've decided to go the other extreme and keep all my gear and upgrade to a proper astro CCD instead

Here's what I've been considering for my William Optics FLT-132 f/7 scope:

* Atik 383L+ Mono camera
* Atik Electronic Filter Wheel 2 with 9 position, 1.25" carousel
* Astrodon Tru-Balance Gen 2 E-Series 1.25" LRGB filter set
* Astrodon 5 nm H-alpha 1.25" filter (the 3 nm cuts out NII)
* Astrodon 3 nm OIII 1.25" filter
* Astrodon 3 nm SII 1.25" filter
* Geoptik Canon EOS lens -> T2 adapter

Any thoughts or suggestions about this combination? I figured I could do narrowband imaging in my light polluted back yard, and travel occasionally for LRGB. If there are no potential problems with this kit, then I'll start saving $$$ and selling organs

I had considered the SBIG ST-8300, but it requires more back focus (can't be used with the filter wheel on Canon EOS lenses) and substantially more expensive 36 mm filters.


Cheers,

Dave
Reply With Quote
  #2  
Old 04-01-2012, 02:49 PM
gbeal
Registered User

gbeal is offline
 
Join Date: Oct 2004
Location: New Zealand
Posts: 4,306
Dave,
ah, logic prevails, keep the FLT. I did consider a swap for my truss newt, but the shipping would have killed the idea.
The 8300 chip is a good one, and lots about to. I feel you might need bigger than 1.25" filters though, might being the operative word. Check to see if others have succeeded with them. I tried them with my SXVR-H16 and while they DID work, the 2" were better. 36mm is a good "in-between" though.
In keeping the costs down a bit, maybe consider a filter slide, I use the TS one, it is only 15mm thick.
The AstorDon's are not cheap, not at all, but they are well liked.
Good luck.
Gary
Reply With Quote
  #3  
Old 04-01-2012, 06:31 PM
naskies's Avatar
naskies (Dave)
Registered User

naskies is offline
 
Join Date: Jul 2011
Location: Brisbane
Posts: 1,865
I was almost free of the imaging itch, but then got suckered back in...

Thanks for the tip. I've been trying to research the 1.25-inch vs 36 mm filter issue online, and so far it seems like I might be okay with my f/7 scope. Atik claims that anything slower than f/5 will be fine because their filter wheel is very close to the 383L+ sensor, and the RGB flats I've seen posted online with f/7.5 scopes don't have any vignetting issues. I'm not sure whether 3 nm filters would be okay though - I've come across speculation that it could be problematic.

Last edited by naskies; 04-01-2012 at 06:59 PM.
Reply With Quote
  #4  
Old 05-01-2012, 04:12 PM
naskies's Avatar
naskies (Dave)
Registered User

naskies is offline
 
Join Date: Jul 2011
Location: Brisbane
Posts: 1,865
Oops, I got my maths wrong... turns out the 383L+ requires 17 mm back focus, 22 mm for the filter wheel, and 19 mm for the Geoptik = total of 58 mm.... i.e. 14 mm too long for Canon EOS mounts.

After a bit more reading, I see that SBIG makes a special 36 mm filter wheel for the ST-8300 that has enough back focus for Canon EOS and Nikon lenses (FW8-8300 with their proprietary adapter). Astrodon also happens to make the full LRGB/Ha/OIII/SII filter set in 36 mm sizes too.

Hmmm tough choice - 36 mm filters with the ability to use my Canon L lens collection, or 1.25" filters and save a lot of money?

Either way, I think I'll go with the SBIG ST-8300M instead to at least have the option of using my Canon lenses.
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 04:20 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Advertisement
Astromechanics
Advertisement
Lunatico Astronomical
Advertisement
Celestron RASA
Advertisement
Testar
Advertisement
Star Adventurer
Advertisement
EQ8-R
Advertisement
Bintel
Advertisement
Astronomy and Electronics Centre
Advertisement