William Optics

Bahtinov Focusing Mask


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  • Regular price $43.00

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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.

Model
MM Inches
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
    SKU: BM-DS-GR45
    Barcode: