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The new Optical acrylic sheet offers 92% of light transmission that gave you the highest and brightest diffraction Spikes for Focusing - about 3 times brighter than traditional bahtinov masks!
Includes metal pegs to hang the mask over the front dew shield while focusing.
Select the size appropriate for your telescope or lens.
|BM-DS-GR45||75 - 110||2.9 - 4.3
|BM-DS-GR55||105 - 148||4.1 - 5.8|
|BM-DS-GR90||172 - 235||6.7 - 9.2|
|BM-DS-GR150||243-308||9.5 - 12.1|