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peregrineflier
professor emeritus
Reged: 09/14/08
Posts: 547
Loc: Lost wages, Nevada (las Vegas...
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Hi, I have an Orion 80ED guidescope and a DSI one mono as a guide camera. Can I use a barlow while guiding?
Thanks, Tom
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Thanks, Tom
Aka as "james" my first name.
It's a good day, my proctologist called today with good news, he found my head!
Meade 8in SCT
Orion 80ED
Orion hypertuned EQ-G
Orion Starshoot DS one
Meade DSI mono
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Galaxyhunter
Pooh-Bah
Reged: 01/02/06
Posts: 1257
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Technically yes you can. But as the Star light passes through more glass, it is harder to get the nice crisp clean focus.
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Carl
My lousy skies at Hawkeye Observatory
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John Wunderlin
Vendor - Spike-a Focusing Mask
Reged: 10/01/04
Posts: 699
Loc: Mineral Point, Wi
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As a practical matter, I'm not sure it helps much. PHD gives sub-pixel guiding accuracy. I regularly image with my 2500mm 10" LX50 while guiding with my ED80 (not barlowed) - works quite well. Also, I find it hard enough to find guide stars as it is without reducing the field of view by 1/2!
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John Wunderlin
Vendor - Spike-a Bahtinov Focusing Mask
Empire Ranch Observatory
Iowa County Astronomers
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peregrineflier
professor emeritus
Reged: 09/14/08
Posts: 547
Loc: Lost wages, Nevada (las Vegas...
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Really, I just need a temp fix until I can come up with a extention tube so I can reach focus with my dsi, I was stuck in the field and had to use a diag to get focused, my 2in TV big barlow is just long enough but was not sure if it would work.
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Thanks, Tom
Aka as "james" my first name.
It's a good day, my proctologist called today with good news, he found my head!
Meade 8in SCT
Orion 80ED
Orion hypertuned EQ-G
Orion Starshoot DS one
Meade DSI mono
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Footbag
sage
Reged: 04/13/09
Posts: 468
Loc: Scranton, PA
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I tried this as well as a fix to needing a bit of extention, but couldn't get focus.
That said, as well as halving the field, it also increases the focal ratio. Add flexure into the mix and I don't think it's worth it.
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Adam
Celestron CPC 800, Celestron HD Wedge
Hyperion 17mm, Celestron 40mm Plossl, TMB 9mm
WO 66, SSAG
Modded Canon XS
Lackawanna Astronomical Society
My Gallery
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AlanT
sage
Reged: 08/20/07
Posts: 488
Loc: 122º36' W, 47º37' N, WA USA
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I use a modified 50mm finder with a DSI Pro as a guide scope. Because the native FL is only about 170mm and the pixels in the DSI are kinda biggish, I've been using a 2x barlow. The focus is soft, but it seems to work well.
al
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al
Meade 80mm APO
Celestron 6" SCT
CGE, GM-8, & CG-5 GT
ST-2000xcm, DSI Pro II, DSI Pro
( www.alberts-astro.com/astro )
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John Wunderlin
Vendor - Spike-a Focusing Mask
Reged: 10/01/04
Posts: 699
Loc: Mineral Point, Wi
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Quote:
Really, I just need a temp fix until I can come up with a extention tube so I can reach focus with my dsi, I was stuck in the field and had to use a diag to get focused, my 2in TV big barlow is just long enough but was not sure if it would work.
I had a cheap barlow that I used as an extension tube for a bit. I took out the lens and didn't slide the tube all the way in the focuser. It did the job, but you really need a proper extension tube.
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John Wunderlin
Vendor - Spike-a Bahtinov Focusing Mask
Empire Ranch Observatory
Iowa County Astronomers
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