Amazon.com : Astromania Bahtinov Mask Focusing Mask for Telescopes - FM60mm for a Tube Outer Diameter (OD) from 65mm-100mm - can be Mounted with The Brass Screws Inside or Outside The drawtube :
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CPT and Lorentz Symmetry : RELEVANCE AND PROSPECTS OF MAGIC TELESCOPE GAMMA-RAY OBSERVATIONS FOR LORENTZ SYMMETRY TESTS