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Andrew Welsh
Carpal Tunnel
Reged: 03/28/06
Posts: 2302
Loc: Rochester, NY
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This is also posted in the cats-casses forum, since I don't know which area is best to post...
What adapters would I need to incorporate a 2" filter in the optical path to do prime focus photography on a Meade LX200 8" "classic" SCT using a Digital Rebel XT and T-adapter? Is it possible?
I found a way to get a 1.25" filter in the optical path... use the Meade eyepiece-SCT adapter (comes with scope), which threads to the back of the scope and has a 1.25" hole with set screw. Then, I use the nosepiece of the Meade ETX Camera adapter #64 (which is a 1.25" eyepiece nosepiece to t-thread adapter, also houses small plossl eyepieces if desired). The ETX camera adapter has threads in the 1.25" nosepiece for filters, and the other end is a t-thread.
The only downside to the 1.25" setup is I get some vignetting. A flat frame shows the vignetting is similar to the my regular prime focus setup using the standard Meade SCT-to-t-thread camera adapter for the LX200... probably because this adapter holds the camera about 3" away from the scope, and my 1.25" eyepiece adapter-to-t-thread setup is much closer to the back of the scope.
I'm looking to get an astronomik UHC filter and don't know if I should get the 1.25" or 2". Big difference in price. If anyone can tell me how I can hook up a 2" filter to the t-thread adapter on my DSLR at prime focus that would be great. Thanks!
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LX200 8" classic, f/10, Meade eq. wedge, .63x FF/FR
Canon 40D and 5D, unmodified
Canon EF 300/2.8L IS, 400/5.6L, 135/2L, 50/1.8, 85/1.8, 35/2, 24-70/2.8L, and Peleng 8mm fisheye
Orion Apex 102mm (4") Mak-Cass
Pimped out with accessories and bling
My DSLR Astrophotography Webpage and photo bucket with full equipment list
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imjeffp
Senior Space Cadet
Reged: 09/30/03
Posts: 4497
Loc: Cedar Park, Texas
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scope-->2" visual back-->2" filter-->threaded 2" barrel to sct thread adapter-->sct-t adapter-->t-ring-->camera
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Blog
ST80 • AT80EDT/LXD650
ETX-90/DS-2000 • 10" LX200 Classic ("The Quarter-Meter Telescope at the Heritage Park Observatory")
SPC900NC • DMK21AF04 • Digital Rebel XT
  
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Andrew Welsh
Carpal Tunnel
Reged: 03/28/06
Posts: 2302
Loc: Rochester, NY
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Thanks for responding. I have a few questions because I don't know exactly what parts you're talking about...
Quote:
2" visual back->2" filter
Do you mean the 2" filter threads directly onto the SCT, or do I need to buy a 2" version of the SCT-to-eyepiece adapter (with a set screw)? I already have a 1.25" SCT-to-eyepiece adapter (which is explained above).
Quote:
threaded 2" barrel to sct thread adapter
Where do I get one of these?
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LX200 8" classic, f/10, Meade eq. wedge, .63x FF/FR
Canon 40D and 5D, unmodified
Canon EF 300/2.8L IS, 400/5.6L, 135/2L, 50/1.8, 85/1.8, 35/2, 24-70/2.8L, and Peleng 8mm fisheye
Orion Apex 102mm (4") Mak-Cass
Pimped out with accessories and bling
My DSLR Astrophotography Webpage and photo bucket with full equipment list
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Ben Ritchie
Lost in Space
Reged: 01/31/05
Posts: 4339
Loc: Bosham, UK
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Quote:
Quote:
threaded 2" barrel to sct thread adapter
Where do I get one of these?
One came with my LX200, but the usual accessories companies sell them (e.g. the Astro-Engineering AC304)
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Astro-Physics 130EDT StarFire, 80ED (x2), 305mm f/5 dob, VLT
Astro-Physics 1200GTO, evolved HEQ5/pro
Coronado SM60/BF10, 3-6 Nagler zoom, 8 & 13 Ethos, 28UWAN
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imjeffp
Senior Space Cadet
Reged: 09/30/03
Posts: 4497
Loc: Cedar Park, Texas
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A 2" version of the SCT-to-eyepiece adapter is what I use. Mine's from Astro-physics.
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Blog
ST80 • AT80EDT/LXD650
ETX-90/DS-2000 • 10" LX200 Classic ("The Quarter-Meter Telescope at the Heritage Park Observatory")
SPC900NC • DMK21AF04 • Digital Rebel XT
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