Celestron NexStar 6se 8se focus adjuster

thingiverse

this little thing helps you to get your objects right in the focus. it becomes especially helpful in astrophotography. just stick it over the focus-knob on your telescope and you can adjust your focus as you prefer. haven't tried it yet, should work fine tough. hint: combine this with a bahtinov mask and you will get the best out of your telescope