Gosky Bahtinov Focusing Mask for Telescopes Dew Shield Diameter from 95mm -140mm (3.74inch - 5.50inch) - for 100mm,120mm Skywatcher Refractors, Celestron 4 SE Etc

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Gosky Bahtinov Focusing Mask for Telescopes Dew Shield Diameter from 95mm -140mm (3.74inch - 5.50inch) - for 100mm,120mm Skywatcher Refractors, Celestron 4 SE Etc
- 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 maskÂ
TheÂ Bahtinov maskÂ is a device used to focus small astronomical telescopes accurately. It was invented by Russian amateur astrophotographerÂ Pavel BahtinovÂ in 2008. Accurate focusing ofÂ telescopesÂ andÂ astrographsÂ is particularly of concern to those involved inÂ astrophotography. The telescope is pointed at a brightÂ star, and a mask is placed in front of the telescope'sÂ objectiveÂ (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

P.S:

30 days return warrant . Full life technical support. For any reason you are unhappy with any product by us, please do not hesitate to contact us. We take full ownership and responsibility for the quality of our products and will do best to solve your problem quickly and efficiently. Any suggestion will be warmly welcomed.
Country USA
Brand Gosky
Manufacturer Everest
Binding Electronics
ItemPartNumber QHAI120
UPCs 703501415143
EANs 0703501415143
ReleaseDate 0000-00-00

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Country	USA
Brand	Gosky
Manufacturer	Everest
Binding	Electronics
ItemPartNumber	QHAI120
UPCs	703501415143
EANs	0703501415143
ReleaseDate	0000-00-00