Conversion ring and holder to make your Celestron finder as compact guider
thingiverse
[UPDATED 2/20/2021] Now that I have converted it to guide scope, why not design to hold it? I don't like original finder holder's three screw adjustor. Guide scope just needs tight connection rather than adjust. You need 20mm M4 screws and nuts to assemble. It will fit Baader standard finder shoe. Hope it helps! No support needed for screw and nut holes. [UPDATED 2/18/2021] Recently I found that finder side thread has too much play and not as secure as I wanted. So, increased diameter by 0.3mm with finer mesh. [Original Post] I have old Celestron finder and needed a compact guider to use with wide-field refractor. So, I removed cross-haired eyepiece side and make a male-to-male thread converter to connect T-threaded (M42/0.75) guide camera to the finder. This finder has rotating objective with thread to adjust focus, so don't need additional focuser but just adapter. It securely connect ASI camera to finder and converts it as F3.5 fast optics. If you have a Celestron finder and need of compact guider, this may help you. No support needed but print with 0.1mm or less layer to print thread correctly.
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