Diffraction Spikes Bahtinov Focusing Mask for Telescopes Dew Shield Diameter From 243mm -308mm

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Diffraction Spikes Bahtinov Focusing Mask for Telescopes Dew Shield Diameter From 243mm -308mm

BM-DS-GR150
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Diffraction Spikes Bahtinov Focusing Mask for Telescopes Dew Shield Diameter From 243mm -308mm

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