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SVBONY Bahtinov Mask is compatible with any type of telescope, and especially useful for astrophotography setups 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. Adjustable screws Three adjustable padded pegs provide a secure grip once installed on a telescope Don't worry about it being damaged SVBONY Bahtinov Mask is made of aluminum alloy, they are stiff and long lasting.They will never be brittle in the cold, unlike some other masks which are made from normal plastics Features: Aluminium alloy material thickness: 1 mm Weight: 104g Package Include: 1 X Bahtinov Mask 3 X Screw Kit