Gosky Bahtinov Focusing Mask for Telescopes front end diameter From 105 - 150mm for More Precise and Faster Focusing - All Metal Construction
The Bahtinov Mask Made of Metal, not plastic.And it has whole anodizing aluminium process.
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. Change your focus, take another picture and again, view your diffraction spikes. Is the center spike moving further from center? 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.
Package Include:
1 X Bahtinov Mask
4 X Screw Kit
P.S:
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.
from Consumer Electronics Store http://cestore.net/accessories-supplies/camera-photo-accessories/telescope-accessories/dew-caps/Gosky-Bahtinov-Focusing-Telescopes-Diameter.html?pid=B00YWH7FL4
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