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Astrophotography and Sketching >> DSLR & Digital Camera Astro Imaging & Processing

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Mr Greybush
scholastic sledgehammer
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Reged: 05/16/13

Loc: Virginia
OAG with Slr new
      #6128307 - 10/10/13 02:04 AM

Has anyone ever had success with an AOG using an SLR. I know I've read every article that has said no but does it really work. I'm curious and not to say I would spend any money on it but if you don't ask you don't know right

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guyroch
Vendor (BackyardEOS)
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Reged: 01/22/08

Loc: Under the clouds!
Re: OAG with Slr new [Re: Mr Greybush]
      #6128515 - 10/10/13 08:25 AM

It works wonders, not sure what articles you read that said otherwise.

With a DSLR you need to make sure you maintain the right distance if you are also using a focal reducer and the added length of a OAG can mess up that distance in a hart beat.

The key is to get a thin OAG; there are a few available. The best thin and somewhat affordable OAG I have seen (and purchased) is the Lacerta OAG... but it's only available from Teleskop Services in Germany.

http://www.teleskop-express.de/shop/product_info.php/info/p2722_Lacerta-Off-A...

Hope this helps,

Guylain


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Footbag
Post Laureate
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Reged: 04/13/09

Loc: Scranton, PA
Re: OAG with Slr [Re: guyroch]
      #6128597 - 10/10/13 09:16 AM

Not only does it work, but it works much better then a piggybacked guidescope. It gives tighter, rounder stars and flexure becomes a non-issue.

The key is to get a good OAG as Guylain suggested and also a very sensitive guide camera. The Lodestar is a good one.

A good OAG setup with the camera will be $700+. IF you skimp, you may have a useless piece of hardware. I think that is why a lot of people try and are disappointed with OAG's. I tried three before settling on the TS OAG9EOS.


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Mr Greybush
scholastic sledgehammer
*****

Reged: 05/16/13

Loc: Virginia
Re: OAG with Slr new [Re: Footbag]
      #6128981 - 10/10/13 12:25 PM

The cameras I have are an ASI120 and a Meade dsi. I think the ASI will be sensitive enough? I can't afford a loadstar

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guyroch
Vendor (BackyardEOS)
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Reged: 01/22/08

Loc: Under the clouds!
Re: OAG with Slr new [Re: Mr Greybush]
      #6129059 - 10/10/13 01:06 PM

Quote:

The cameras I have are an ASI120 and a Meade dsi. I think the ASI will be sensitive enough? I can't afford a loadstar




The ASI120 mono should be good enough... but as the SSAG it's a bit bulky and it may be difficult to use with a DSLR and OAG. The big body of a DSLR may obstruct the ideal position of the guide cam as needed. For this reason the Lodestar, ST-i, or QHY5L-II are better suited for OAG / DSLR combo.

Hope this helps,

Guylain


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Mr Greybush
scholastic sledgehammer
*****

Reged: 05/16/13

Loc: Virginia
Re: OAG with Slr new [Re: guyroch]
      #6129066 - 10/10/13 01:10 PM

True looks like I'm up to saving some money. Thanks guys

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petemumbower
Carpal Tunnel


Reged: 07/12/09

Loc: West Michigan
Re: OAG with Slr new [Re: Mr Greybush]
      #6129279 - 10/10/13 02:53 PM

It sure does work. I just got the Orion thin OAG(TAOG) and a QHY5L-II. After getting the focus set, it guided great and my stars were pretty much round and consistent from frame to frame! Well worth the money(I spent around $470 for this combo) and learning curve.

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SuperBlueNova
member


Reged: 09/29/13

Loc: Madison, WI
Re: OAG with Slr new [Re: petemumbower]
      #6129487 - 10/10/13 04:59 PM

Would the OAG interfere with a full frame sensor?

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