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How thick is the OAG? I image with a GSO 8" imaging newt (f5) and use the GSO coma corrector ahead of my DSLR and it works very well. The GSO newt come with a 35mm extension so it can be used for visual use as well. The reason for asking about the OAG thickness is to work out whether a spacer is required between the coma corrector and camera. The coma corrector can be taken apart and just the lense element section used with appropriate T-thread spacer if required. Focal point is best around 80mm from the top lense element of the coma corrector to the sensor. What sort of camera are you using?
I picked the f5 GSO to improve coma management (there isn't any right out to the edges with my setup), and would recommend it over the f4 if your mount can handle the longer tube length (1000 fl ).
I use a guide scope (ASI130 camera) riding on top the tube on a long dovetail bar. So guiding weight is not on the focuser. The GSO focuser holds my coma corrector and camera (Canon 450D) with no problem - just remember to lock the focuser screw once focused. I am not sure how much an OAG and its camera would add to the weight on the focuser. I had considered upgrading to a Moonlight but so far the stock focuser is doing fine.
BTW those scopes are rediculously cheap at Andrews right now.
Last edited by glend; 30-08-2014 at 05:02 PM.
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