Build Your Own Bahtinov Focus Mask

Wanna make a scope? Or better still, grind a mirror yourself. Or, you have some good tips in making a really useful accessory? This is the place to show what your hands can do...
Post Reply
User avatar
Posts: 312
Joined: Mon Aug 31, 2009 3:35 pm
Favourite scope: Borg 76 + Solar Scope SF50
Location: Bukit Batok

Build Your Own Bahtinov Focus Mask

Post by yltansg » Mon Oct 15, 2012 8:11 pm

I have seen some sifus using a focus mask for AP focussing. I decided to make one myself using the mask generator at:

This is the mask for a 127mm ED refractor


A out-of-focus Sirius


A focus Sirius


User avatar
Posts: 3790
Joined: Tue Sep 30, 2003 7:06 am
Location: Toa Payoh

Re: Build Your Own Bahtinov Focus Mask

Post by Gary » Mon Oct 15, 2012 9:51 pm

Congrats and thanks for sharing the link! :)
email: gary[at]
twitter: @astrosg

"The importance of a telescope is not how big it is, how well made it is.
It is how many people, less fortunate than you, got to look through it."
-- John Dobson.

Post Reply