NightSky 200mm Bahtinov Focusing Metal Mask


New product

$ 18

  • The Bahtinov Mask Made of Metal, not plastic.And it has whole anodizing aluminium process.
  • Masks now feature 4 holes which can be attached with 4 screws to prevent the mask from falling all the way to the ground
  • It will take lesstime to achieve perfect focus with your new mask and will mean you spend more time imaging photons rather than focusing them

This product is no longer in stock

 How to use it?

      1.Place the Bahtinov Focus-Mask over the end of your telescope, then locate a bright star near your target, take a 3-5 second picture and view the diffraction spikes.

      2. Change your focus, take another picture and again, view your diffraction spikes. Is the center spike moving further from center?

      3. Then change the direction your focusing and try another picture. Watch the direction the spikes are moving and when the center spike passes the middle of the other two spikes, change direction and fine tune your tuning knobs until the center spike is in the middle. Your now in perfect focus.

Card Code8001510940

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