New!

The Bahtinov mask has quickly become the standard method of focusing a telescope quickly either visually or when used with an imaging system (CCD, webcam, DSLR etc).

The mask exploits a unique diffraction profile to provide a simple method of assessing focus error by assessing the position of one part of the diffraction pattern that moves in response to changes in focus and displays the error as displacement from an obvious zero point. The mask makes the judgement of critical focus position easy and repeatable.

Watch the animated middle picture (left) and you'll get the idea. When the moving spike is centred in the crux of the X - the telescope is focused. The system is capable of bringing a telescope to perfect focus in under a minute - even in the worst of seeing conditions.

Available in the following sizes (drop down menu below shows prices):

80mm SFL (short focal length) refractor: One mask fits all 80mm including, Skywatcher ED80,Celestron ED80, Meade 5000 ED80, Revelation D80, Vixen 80 etc

100mm refractor: One mask fits all 100mm including - Skywatcher ED100, Tal 100R, William Optics Megrez 102, etc.

5" Mak Cass: Meade ETX125 & SW Skymax 127

6" SCT:Meade ETX-LS & Celestron NextStar 6

8" SCT: Meade 8” SCT & Celestron (one mask fits all)

8" Newtonian: Skywatcher Explorer 8” etc

9.25" SCT: Celestron C9.25”

10" SCT: Meade 10” SCT (one mask fits all.

10" Newtonian:Meade LXD55/75 10” SNT & SW Explorer 10” (one mask suits both)

12" SCT: Meade 12” SCT (one mask fits all).

More sizes to follow shortly.