Have a bespoke Tri-Bahtinov mask and cover custom-made to fit your telescope.
 
The maximum diameter available is 390mm, which roughly corresponds to a 14" telescope. Each mask has an oversized finger tab and is white for easy handling in the dark. Please note that due to normal design limitations the mask will not be a snug fit. It will sit loosely but securely on the end of the telescope.
 
When ordering, please fill in the fields to let me know the inside diameter of the ring at the front end of your telescope, and the focal length so I can optimise the pattern (if you use a focal reducer, include that). A photograph of the end of your telescope would be helpful too (please email to sales@astroprinter.co.uk). Alternatively, you can choose from the list of masks I have already made.
A bespoke mask (and cover for checking collimation) will be 3D-printed from durable, environmentally-friendly PLA plastic.
 
Credit to Satoru Takagi, C. Y. Tan et al for their work on this design.
 
Check the list below to see if your mask has already been made to avoid measuring!
Celestron NexStar 90SLT
Celestron NexStar 4SE
Celestron NexStar 127SLT
Celestron Astromaster 130EQ
Celestron Evolution 6
Celestron C8
Celestron Evolution 8
Celestron Advanced VX 8"
Celestron 8" SE
Celestron Evolution 9.25"
Celestron 9.25" XLT
Celestron C11
Celestron CPC 1100
Meade LXD55 6"
Meade LX85 8"
Meade LX90 8"
Meade LX90 10"
Meade LX6 8"
Meade LX200 8"
Meade LX10 8"
Meade LX200 10"
Meade RCX-400 10"
Meade LX850 14"
Orion Optics UK VX6
Orion Optics UK OMC140
Orion XT8
Orion XT10
SharpStar 150mm f/2.8 HNT astrograph
Sky-Watcher Skymax 90
Sky-Watcher Skymax 127
Sky-Watcher Skymax 180
Sky-Watcher StarQuest 130P
Sky-Watcher 130P
Sky-Watcher 150P
Sky-Watcher 200P (Pictured)
Sky-Watcher Flextube 250P
StellaLyra 6" f/12 M-CRF Classical Cassegrain
TAL 150P
Vixen R130S