Product: SVBONY Bahtinov Mask Focusing Mask Aluminum Alloy Telescope Focusing Mask 60-115mm Caliber Fixed Diameter 65-100mm
Brand: SVBONY
SVBONY Bahtinov mask has become the preferred method of focusing a telescope, either visually or when imaging with a CCD camera, DSLR or webcam.
 Please be assured that these focusing masks will work excellently for both reflectors and refractors with whatever focal length. 

 Note: you need to measure your telescope tube size and choose the right size of the mask.

 How to use SVBONY Bahtinov Focus-Mask?
 Step 1:Place the SVBONY 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. 
 Step 2: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. 
 Step 3: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.

 Come with well protected 3 screws
 The masks grip the telescope tube gently but firmly with three metal posts which have non-scratching silicon sleeves to protect you valued telescope surface.

 Solid design
 Premium grade of aluminum, valued for fall resistance.Don't worry about it being damaged.

 Very thin and lightweight
 A thin bahtinov mask can help you achieve the purpose of focusing, and the light weight will not break the balance of your telescope.


 Features:
 Masks now feature 3 holes which can be attached with 3 screws to prevent the mask from falling all the way to the ground
 Perfect focusing for your CCD, DSLR or Webcam in seconds
 Aluminium alloy material thickness: 1 mm
 Weight: 31g

 Package Include: 
 1 X Bahtinov Mask 
 3 X Screw Kit
The main function; SVBONY bahtinov masks take the guesswork out of focusing and even get over the seeing conditions
3-post mounting; SVBONY masks grip the telescope tube gently but firmly with three metal posts; This prevents slippage; whilst allowing the mask to remaining perfectly central
SVBONY Bahtinov Mask is made of aluminum alloy; not plastic; And it has whole anodizing aluminium process
Thin and light design; Aluminium alloy material thickness is 1 mm; Light weight so you wont upset the balance on your scope
Suitable for telescopes front end diameter 65mm to 100mm; Universal adaptation; 3 bolts with plastic cover allow the mask to be simply attached to any telescope

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