Guide scope from a 6x30 finder scope: T2 adaptor

prusaprinters

<p>Turn your 6x30 finder scope to a compact guide scope!<br>This adapter allows you to mount a (ZWO) camera with 12.5mm backfocus and a T2 thread to this 30mm finder scope.<br>I tested it with my SkwWatcher 6x30 finder scopes. The scope has a very short backfocus, but with this adaptor it is possible to focus it at infinity with a ZWO planetary camera.<br>A mini-Bahtinov mask is also included.<br>Print it in PETG with variable layer height (or 0.1mm) beause of the fine threads.<br>I spent quite a lot of time to dial in the correct thread sizes, at least it is fine with my 6x30 finders and ZWO planetary cameras.<br>The finder scope has a quite soft image, but PHD2, or SharpCap polar alignment tool works fine with it. A larger guide scope is better in terms of fainter guide stars or a few 0,1"s better guiding accuracy, but this 30mm one is much smaller and lighter, and very affordable, especially if you need an extra, portable guide scope.<br>The focal length of mine is 123mm.</p><p>UPDATE: I added a version (V4) with a pocket for a 20*2.0mm BG38 UV/IR filter. &nbsp;These can be found on Ali for a few bucks, just simply glue in the filter. This helps A LOT to reduce the halos around bright stars.</p>