Suitable for telescopes Dew Shield or Front Outer Diameter From 95mm -140mm (3.74inch - 5.50inch) - For 100mm,120mm Skywatcher Refractors, Celestron 4 SE Etc.
Bahtinov masks make focusing for astrophotography an easy task. Watch the two slanted areas create an "X" over the star. The vertical slits create a moving bar that is centered on the X when you are at focus.
The mask attaches securely to your scope using brass screws with soft transparent nylon cover to ensure the finish of your telescope is protected.
Light weight so you wont upset the balance on your scope.
It will take less time to achieve perfect focus with your new mask which mean you spend more time imaging photons rather than focusing them
Make your focusing for astrophotography an easy and magic task .
About Bahtinov mask The Bahtinov mask is a device used to focus small astronomical telescopes accurately. It was invented by Russian amateur astrophotographer Pavel Bahtinov in 2008. Accurate focusing of telescopes and astrographs is particularly of concern to those involved in astrophotography. The telescope is pointed at a bright star, and a mask is placed in front of the telescope's objective (e.g. primary mirror).
How does it work? Set up your telescope and imaging equipment as normal. Then simply locate a bright star (maybe Spica?) with your telescope, attach the Bahtinov mask to your telescope and watch the diffraction spike pattern around the star as you adjust the focus. When the middle diffraction spike is centered in the outer spikes, you're in focus. Very little focusing travel is required to move the inner diffraction spike, which means the focus is extremely accurate.
Program type> Suitable for telescopes Dew Shield or Front Outer Diameter From 95mm -140mm (3.74inch - 5.50inch) - For 100mm,120mm Skywatcher Refractors, Celestron 4 SE Etc.
Package Include: Bahtinov Mask 3 X Brass bolt
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Most Helpful Customer Reviews
Best price, works great, especially with my camera on the telescope. Easy to focus through live view when aimed at a bright star.
I got around to opening this after the weather cleared up and sat there wondering just how in the world this thing goes together. It appeared that I was missing three screws, However, the pins come apart and it is fairly easy to assemble. I wish they would put a note in to inform buyers of this. Seems a little expensive for what you get but they do work well.
If I had known it came WITHOUT SCREWS, I would never have paid for it. Had to make a run to the local home improvement store & search for half an hour to find 3mm screws to fit the brass fittings that surround the dew shield; not a lot of money, but a 15 mile drive (each way). NOT convenient. No more Gosky products for me.
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