Bahtinov Mask
Perfect focus, every time
An essential accessory for any serious astronomer. The Bahtinov mask creates a characteristic diffraction pattern that allows you to achieve optimal focus in seconds, even with the most demanding instruments.
Why use a Bahtinov mask?
Foolproof focusing
The 3-spike diffraction pattern visually tells you when focus is perfect — no guesswork.
Save time
No more endless back-and-forth. Achieve focus in seconds, even in the dark.
Custom 3D printing
Each mask is designed and printed specifically to fit your instrument perfectly.
Astrophotography ready
Ideal for star focusing before your astrophotography sessions.
Choose your model
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What our customers say
"I bought these 3 collimation knobs for my Orion XX14i Dobsonian. They replace my old steel screws which, although sold for this purpose, did not have rounded ends and ended up punching the back of my secondary mirror support. The ones from La 3ème dimension are nicely rounded, which makes the adjustment much smoother, without jerks and much more precise. Very satisfied, thank you!"
"I asked Raphael to design several Bahtinov masks in different sizes for me. The work done is impeccable, and done with seriousness and rigor. I am fully satisfied. I will not hesitate, in the future, to call on his expertise."