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Thanks for the info avandonk. I've just ordered one of these. As the Borg is somewhat modular, I'm also picking up a #7425 and a #5005, so that I can use it on my Canon and in a 2" focuser. Ted from Hutech reminded me that the threads on this are not t-threads, so the Borg t-ring becomes a necessity. Given how large the clear aperture of this beast is, I should be happy with it for some time to come.
I'll do some side by sides with my WO Flattener III when it arrives, and then likely put the WO up for sale. I was being cautious as all up this is going to be over twice the price of the itself-not-cheap WO, to remove the slight amount of astigmatism I am seeing with my scope. I do like Hutech's 30 day return policy.
The earlier test shot I had posted using the WO had a mistakenly inserted spacer in the image train that was exacerbating the astigmatism by increasing the reducer to sensor distance to 63mm, but it is still there (albeit to a lesser extent) when imaging with the proper 55mm reducer to sensor distance.
Regards,
Eric
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