Celestron 9x50 Finder Scope to Guide Scope conversion kit

thingiverse

Have a Celestron 9x50 finder scope lying around taking up space and being all useless?Convert it to a 50/228 (F4.56) finder scope! Remove the eyepiece, screw in the adapter, insert one of the narrow mini guide cameras from ZWO (QHY ones might work, too), and voila, you have yourself a guide scope / camera.Focus should be perfect if you remove all extension rings from the camera and push it all the way in. You can insert threaded insert into the hole (M3 / 5mm diameter) and use an M3 hex screw to keep the camera from sliding out. I also have a tube which should fit the scope perfectly (again, use an M4 / 6mm diameter threaded insert & M4 screw for fixing) and will fit into a finder shoe of your scope.Use your finest settings (0.4mm nozzle at most; 0.6mm nozzle couldn't cut it + 0.08mm layer height) at least for the adapter that has the threads.If you want to get fancy, you can use the second file, which is a recessed adapter (M51x0.75 -> T2) to which you can screw on a ZWO T2-1.25" helical focuser you can purchase for $50 or so. This will ensure perfect focus under various conditions, but would only really make sense if you already have a focuser lying around (like I did). If you are going to spend money purchasing it, then converting the finder scope becomes less worthwhile :DThe third file is somewhere between the above two. It will screw onto the guide scope with the eyepiece assembly removed, like the second file, and you will be able to position the guide camera at the correct location and lock it down with a screw. It allows for some adjustments unlike the first file, but it will be a little clunky compared to the second file. Still cheap though!