| Size | 60-90 mm |
|---|---|
| Compatible Series | Universal |
| Telescope Type | Refractor |
| Focal Length | 16mm - 250 mm |
| Compatible Brand | Universal |
| Brand | Johannes |
| Type | Bahtinov Mask |
Check the listing for details. Adjustable Bahtinov Mask for Various DSLR Lenses. Condition: New. Listed at 29.99 USD. The mask will diffract the light into three spikes. Adjust focus until the middle spike is centered, then carefully remove the mask to begin viewing. Never worry about blurry stars again. Removing the mask won't bump your focus ring.
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