The Bahtinov mask has become the preferred method of focusing a telescope, either visually or when imaging with a CCD camera, DSLR or webcam. Precise and repeatable focus can be achieved in under a minute, even in poor seeing conditions. The mask displays a unique diffraction profile, one part of the diffraction pattern moves in response to changes in focus and displays error as a displacement from a clearly defined point.
Straight sides ensure the focus mask will not roll away when stored on the shelf, matt-black surface prevents reflections and a reflective high visibility corner makes it easy to locate in the dark.
Credit goes to Russian amateur astronomer Pavel Bahtinov for creating the design and making it available to the astronomy community.
|Average Rating (40 Reviews): |
Thursday, 15 September 2022 | Andrew
Poor, simple hang off the end mask with 2 plastic bolts. Mine doesn't even sit centred. Sits almost 1cm too low.
Case of buy cheap buy twice here.
They are designed to hang on the end like this - this works perfectly in practice and bahtinov masks do not need to sit centred to work.
You don't mention the functionality at all but you will find the mask works perfectly and offers a cost effective solution.
Works well, but feels like this item is missing a 3rd plastic skrew for attachement
Friday, 9 September 2022 | Joakim
Everything as expected, but as there are three holes but only two plastic screws included, it would sit better on the telescope with three plastic screws. The material seems slightly simple, but appears to do the job well.
If there were three bolts then one of them would never be in use - these are designed to hang on top of the telescope using two bolts. There are three holes to allow for adjustment / choice of orientation and where the reflective strip is.
Prime focus made easy - Esprit 100ED
Sunday, 12 June 2022 | Ben
It's a rather crude product, but works perfectly. Hang on the end of the OTA, and achieve prime focus in seconds!
Wednesday, 4 May 2022 | Chris
Purchased for the Skywatcher 72ED, works really well and is easy to use.
Tuesday, 19 April 2022 | J
Works....took me a minute of two to figure out that the long plastic screws in the box were for the mask and not for something else in my order also packed in the box
Monday, 28 March 2022 | William
Worked perfectly with ZWO camera. Very quick and simple to use allowing pin sharp imaging by this beginner in astrophotography. Even worked with normal eyepieces which gave a useful check of its accuracy. Quite sturdy.
Monday, 14 February 2022 | Robert
Used it for first time...excellent... I wouldn't be without it now. Ensures your subs in AP are at their optinum focus
StarSharp Bahtinov mask - Evostar 100ED
Wednesday, 2 February 2022 | John
Fast delivery, received after a couple of days. Material is MDF (or the likes but definitely not plastic). Giving it 3 stars as the holes are not in the correct position so you would have to figure something out before you can use it - it is possible that the fixed dew shield for SW Evostar wasn't taken into consideration when putting the holes
Hi John - the Bahtinov mask is designed to hang on. the front using two bolts at a time so the holes are in the correct place for this.
Tuesday, 30 November 2021 | Alan
I now have peace of mind that I am in perfect focus.
StarSharp Bahtinov Focus Mask
Monday, 27 September 2021 | Mark
Excellent piece of kit, makes accurate focus a breeze.
Read all 40 customer reviews...