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 Post subject: Back focua OAG
 Post Posted: Mon Aug 07, 2017 12:25 pm 
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Joined: Fri Jun 02, 2017 2:25 pm
Posts: 4
Hi, I am having problems with calculating the back focus for my OAG. I have an Celetron Edge HD8 with 0.7 focal reducer. Setup as follows:
Telescope
Reducer
Celestron 50mm extender
T2 entender 11mm
T2-T2 2mm
ZWO OAG 16.5mm
Filter 0.7mm
ZWO EFW7 20mm
ZWO ASI1600 6.5mm
The ASI1600 is in focus but I can not get my LoadStar 2 into focus and I am getting very confused with the back focus calculations. Could anyone please help with this.


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 Post subject: Re: Back focua OAG
 Post Posted: Wed Aug 09, 2017 1:49 am 
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Joined: Thu Feb 21, 2013 2:51 am
Posts: 2127
can you put one picture show how do you connect it?

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 Post subject: Re: Back focua OAG
 Post Posted: Wed Aug 09, 2017 6:00 am 
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Joined: Fri Jun 02, 2017 2:25 pm
Posts: 4
Thanks for response Sam, but the problem is now solved. The LodeStar chip was placed very deep in the housing so I added a spacer between the Filter Wheel and the OAG to increase distance. I also reduced spacers in front of the OAG and got good focus for both cameras.


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 Post subject: Re: Back focua OAG
 Post Posted: Wed Aug 09, 2017 10:06 am 
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Joined: Thu Feb 21, 2013 2:51 am
Posts: 2127
that's good news
usually the problem happens like this ;)

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Location:lon=120.6 lat=31.3
SuZhou China


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