Farpoint Adjustable Tri-Bahtinov Mask — 14" to 17" OTAs Universal The bar drawing shows the

The bar drawing shows the hole pattern and measurements

From then on

That lets you attach a Schmidt-Cassegrain accessory — an SCT star diagonal

It was designed to vastly outperform “bargain brand” filters at only a slight increase in price over those low performance filters

the FDCM for the simplest solid platform

Farpoint Adjustable Tri-Bahtinov Mask — 14" to 17" OTAs Universal The bar drawing shows theNot sure this is the right mask for your telescope? Use our Focus Mask Finder match your scope to the right Standard, Tri Bahtinov, or Hyperstar RASA mask. Adjustable Tri Bahtinov focus and collimation mask for OTAs from 14" to 17" front aperture. Sets onto the front of your telescope, gives you focus AND a collimation check from a single short exposure, and lifts off cleanly when you're done. The adjustable peg system fits any scope in this aperture