Brand: Kendrick Astro Instruments

Kendrick Astro Bahtinov Focus Masks (BMC-60)

Brand: Kendrick Astro Instruments

Kendrick Astro Bahtinov Focus Masks (BMC-60)

$35.00 CAD

Bahtinov Mask Option (See Specifications)

BMC-6001-GS 56-92mm BMC-6001-CM 64-100mm BMC-6002-CM 77-108mm BMC-6003-CM 82-120mm BMC-6004 86-148mm BMC-6006 114-166mm BMC-6007 120-180mm BMC-6008-SC 133-184mm BMC-6008 128-190mm BMC-6011 164-226mm BMC-6013 208-270mm BMC-6013-R RASA 208-270mm BMC-6015 250-312mm BMC-6016 264-336mm BMC-6017 294-356mm BMC-6018 320-382mm BMC-6020 364-436mm

Easy Payment Options with .

$35.00 CAD

Easy Payment Options with .

Free Expert Support
Stress Free, Secure Shopping
30 Day Return Policy
Price Match Promise
Full Details What's in the Box? Specifications Reviews and Questions Articles, Videos, Software, Links

Product Description

Kendrick Bahtinov Focus Masks

ALL NEW DESIGN - Now Clear Transparent This innovative focus mask concept was invented by a Russian amatuer astronomer, Paul Bahtinov, and Kendrick is producing these masks with his permission.

The Bahtinov mask allows digital astrophotographers and visual observers to get razor sharp focus in seconds!

The difference in focuser position between the four pictures shown below is very small, a few tenths of a mm. The method is very fast and incredibly sensitive. There is no guessing when you are focused during times of poor to moderate seeing. Simply put the mask and the status of your focus will become immediately apparent.

The masks have a series of slots that create a unique diffraction pattern that can be used to quickly bring your telescope to focus with an absolute minimum of fuss.

Astro Photography Tool (APT)

We are happy to provide a link to an excellent astrophotography tool called APT (Astro Photography Tool) APT has a function called Bahtinov Aid based on Bahtinov Grabber technology and it provides an excellent visual and digital reference when using a Bahtinov mask to come to focus. We do not sell or provide support for APT.

How to Use a Bahtinov Mask

The masks use three adjustable rubber bumpers. This allows them to fit to a wide variety of tube diameters. Simply push the bumper to the desired location on the slot to ensure that the mask is properly centered over your optic. Then focus. The graphic below describes visually what you will see on either side of being focused. This graphic represents movement of the focuser in very small amounts (fractions of a mm). It is extremely sensitive.

Note: There are three ways to use the bumpers on our masks to achieve a proper fit to your telescope:

  • Bumpers can be adjusted to fit “outside” of the tube or dewcap.
  • Bumpers can be adjusted to fit “inside” the tube or dewcap.
  • If fit cannot be achieved using the two methods above, flip the mask over to use the smaller bumper footprint on the flip side.

The Bahtinov Mask is probably the easiest product on the market to achieve tight focus for visual use and for digital astrophotographers, regardless of whether you use a DSLR or CCD camera.

What's in the Box

  • One Kendrick Astro Bahtinov Focus Mask


Tube Diameter Fitting Dimensions:

Bahtinov Mask SKU Min. Tube OD Max. Tube OD Intended Usage
BMC-6001-GS 56 mm 92 mm for 50mm Guide scope
BMC-6001-CM 64 mm 100 mm for 60mm Scopes and Camera Lenses w/ a 60mm Diameter Optic
BMC-6002-CM 77 mm 108 mm for Cameral Lens with 67mm Diameter Optic
BMC-6003-CM 82 mm 120 mm for Cameral Lens with 77mm Diameter Optic
BMC-6004 86 mm 148 mm for 80 mm Optic
BMC-6006 114 mm 166 mm for 90 to 105 mm Optic
BMC-6007 120 mm 180 mm for 105mm to 115 mm Optic
BMC-6008-SC 133 mm 184 mm for 115mm to 125 mm Optic (for C5 SCTs & Mak Cassegrains)
BMC-6008 128 mm 190 mm for 120 mm to 130 mm Optic
BMC-6011 164 mm 226 mm for 150 mm to 165 mm Optic
BMC-6013 208 mm 270 mm for 8" SCT
BMC-6013-R 208 mm 270 mm for 8" Rowe-Ackermann Schmidt Astrograph
BMC-6015 250 mm 312 mm for Celestron C9.25 SCT
BMC-6016 264 mm 336 mm for Meade 10" SCT
BMC-6017 294 mm 356 mm for Celestron C11 SCT
BMC-6018 320 mm 382 mm for Meade 12" SCT
BMC-6020 364 mm 436 mm for Celestron C14 and Meade 14"

Customer Reviews

Based on 1 review
BMC-60 Bahtinov mask.

This bahtinov mask worked perfectly with my SVbony 60/240 guidescope.

Additional Articles, Videos, and Links

Go Ahead, Look at the Sun (With the Right Equipment)

Solar observation and solar photography are a lot of fun with the right equipment, and this is a great time to start.   Every 11 years the Sun’s magnetic field completely flips. That means that the...

Astrophotography for Beginners Step 4: Shooting Deep-Sky Images

Taking deep sky pictures can be daunting, luckily there is an easy process to follow to allow you to get great shots! Here is the typical process for actually taking deep-sky images in the field.

Astrophotography for Beginners Step 3: Choosing Gear for Deep-Sky Imaging

Using a star tracker gains you experience with the fundamentals of deep-sky imaging. Shooting the Moon gains you experience focusing and framing through your telescope. Through your sessions you’ll...

Astrophotography for Beginners - Start Here: Getting into Astrophotography Step by Step

Shooting the night sky has never been more popular, nor easier. The choice of equipment has also never been better, or more affordable. However, as per the advice given by Dickinson and Dyer in the...

Astrophotography for Beginners Step 1: Using the Star Adventurer Tracker

By far the most economical and easiest way to capture beautiful images of the Milky Way and large deep-sky objects like the Andromeda Galaxy (shown here) is to use a star tracker. Here are steps an...

Astrophotography for Beginners Step 2: How to Shoot the Moon

Close-ups of the Moon are rewarding, and an easy way to learn to shoot through your telescope. While good results are possible with a phone camera clamped to an eyepiece (as shown below), this tuto...

Why Should You Trust All Star Telescope?

We've Made All The Mistakes
So You Don't Have To

Learn More