focusing aid
We sell Bahtinov Mask, Tri-Bahtinov Mask, Carey mask and Hartmann mask. The product can be customized
according to your needs.
tri-bahtinov mask
If you are interested in collimation, you may consider the tri-bahtinov mask.
A Tri-Bahtinov Mask for Aiding Collimation and Focusing of Schmidt Cassegrain, Ritchey-Chretien, and Newtonian Telescopes.
Bahtinov Mask
Example diffraction patterns produced by a Bahtinov mask
(middle: in focus, left and right: slightly out of focus)
The Bahtinov mask is a device used to focus small astronomical telescopes accurately. Although masks have long been used as focusing aids, the distinctive pattern was invented by Russian amateur astrophotographer Pavel Bahtinov in 2005. Precise focusing of telescopes and astrographs is critical to performing astrophotography.
The telescope is pointed at a bright star, and a mask is placed in front of the telescope's objective (or in front of the aperture).
Bahtinov mask
Simulation of the Bahtinov mask diffraction pattern, using "Maskulator". Each frame shows a focus difference of 140.6 μm.
Size > Cost
55-70 millimeter Diameter > INR 700
65-80 millimeter Diameter > INR 700
80-95 millimeter Diameter > INR 750
95-110 millimeter Diameter > INR 800
100-115 millimeter Diameter > INR 850
115-130 millimeter Diameter > INR 900
130-145 millimeter Diameter > INR 950
145-160 millimeter Diameter > INR 1000
160-175 millimeter Diameter > INR 1100
175-190 millimeter Diameter > INR 1200
190-205 millimeter Diameter > INR 1300
205-220 millimeter Diameter > INR 1400
220-235 millimeter Diameter > INR 1500
235-250 millimeter Diameter > INR 1600
250-265 millimeter Diameter > INR 1700
265-280 millimeter Diameter > INR 1800
280-295 millimeter Diameter > INR 1900
520-580 millimeter Diameter > INR 3500