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Trevor, I only just discovered that my T-Adapter would accept an eyepiece for eyepiece projection. I tried it out the other night on the moon and i just looked through the viewfinder of the camera to get it to focus. It was no where near where it was when using the scope in prime focus (ie. with no eyepiece) but it wasnt all that hard to find. It was actually closer to where it would have been if the diagonal was fitted. There seemed to be quite a bit of range where it was in focus.
To get a more acurate focus Im sure that hooking it up to a laptop would help.
Just for reference Im using a 90mm f10 refractor and Canon 400D.
Hope this helped a bit, otherwise Im not sure.
Luke
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