Instead of spending on a polemaster, Im gonna try attaching the QHY5LII-M to the back of the orion 8×40 finderscope and use the SharpCap polar aligning feature. My ST80 has too narrow field of view as Sharpcap needs between 1 and 4 deg FOV.
To attach the camera, I unscrewed the eyepiece part of the finderscope exposing the tube. Then I padded 1.25″ extension with thick foam tape used for window insulation. Now the extension tube fits snugly at the end of the finder scope. The camera goes into the tube at its focal point and is held by 2 thumb screws to maintain steady focus.
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