This is not my design -  the original came from Levikaskarolis  https://makerworld.com/en/models/384902?from=search#profileId-285187

This model is simply resized for specifically fit the Canon 70-200mm f2.8 lens - a must have for better deep sky astrophotography.

If you're like me and you suffer from slightly off focus stars, this is the model for you!  I strongly suggest printing in a bright colour.  Astronomy gear tends to be black and can be exceptionally difficult to find when you're in the field at night.