Getting the most light on an OAG, HELP!

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chris_g United States of America
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Getting the most light on an OAG, HELP!

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Post by chris_g »


Hello all,

I am trying to place my OAG to get the most light and not interfere with the camera, below is the best I seem to be able to get. The field is being lit by a artist LED sketch board covering the OTA, what I use to generate flats, the scope is not in focus, this is the view I get.

Unobstructed
unobstructed.jpg
And this is what the OAG looks like under the same light source.
OAG LIve View.jpg


Will it even work? Any help would be greatly appreciated.
Image Cam: Canon 6D (Ha mod), 600D (Stock), SVBony SV405CC
Image OTA: EvoStar ED80, WO Z73, C8-A XLT
Mount: EQ6-R Pro Pier, AZ-EQ5 Pro Pier
Guide OTA: Orion 60mm, WO 32mm, ZWO OAG, SV501P
Guide Cam: ZWO 120mm, 290mm mini
EAA OTA: Orion ST80
EAA Cam: SVBony SV705C
EP: Baader Hyperion Modular Set
Filters: L-Pro Canon EOS C, L-eNhance, L-Pro, Optolong Ha 7mm, Optolong Oiii 6.5mm, Optolong Sii 6.5mm, ES H-Beta
Session Control: Mini PC/Win11 Pro, APT 4.1, PHD2 2.6.10
Processing: PixInsight, DSS 4.2.6, Adobe PS CC, Astronomy Tools Action Set, Star Spikes Pro
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chris_g United States of America
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Re: Getting the most light on an OAG, HELP!

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Post by chris_g »


An update on this:

I solved the light converge issue, it had to do with the light source I was using and location of the OAG in the image circle. I ended up having to use a paper spacer between the camera and the filter wheel to get it to position correctly. At least now the 290's sensor has some illumination across the entire sensor, every little bit helps.
290.jpg


What was more important was an article I found that tells how to get a rough focus on the OAG without having to struggle with it during the day then again at night. The key takeaway from the article is that the distance from the prism to the guide camera sensor must be the same as the distance from the prism to the imaging camera sensor. I was thinking that it needed to be the same as the distance to the FF.

https://astrogeartoday.com/improve-your ... t-started/

Now waiting for clear skies, perhaps the sixth time out with the OAG will be a good one.
Image Cam: Canon 6D (Ha mod), 600D (Stock), SVBony SV405CC
Image OTA: EvoStar ED80, WO Z73, C8-A XLT
Mount: EQ6-R Pro Pier, AZ-EQ5 Pro Pier
Guide OTA: Orion 60mm, WO 32mm, ZWO OAG, SV501P
Guide Cam: ZWO 120mm, 290mm mini
EAA OTA: Orion ST80
EAA Cam: SVBony SV705C
EP: Baader Hyperion Modular Set
Filters: L-Pro Canon EOS C, L-eNhance, L-Pro, Optolong Ha 7mm, Optolong Oiii 6.5mm, Optolong Sii 6.5mm, ES H-Beta
Session Control: Mini PC/Win11 Pro, APT 4.1, PHD2 2.6.10
Processing: PixInsight, DSS 4.2.6, Adobe PS CC, Astronomy Tools Action Set, Star Spikes Pro
Image
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