Ultrablock in very good condition (no scratches that I could see
of any kind) in original box. Rarely used. Orion part #05656. They're asking $119 last I looked, plus about $8 shipping.
Ultrablocks are used as light pollution and nebula filters. A full
description is available on the Orion web site. This screws on to the back of your sct and then you attach the visual back (or directly attach diagonal if it has a ring). My price is $85 including shipping anywhere in con-us.
Thanks for looking. -gn.
ps. I will ship out of country but canadians please take note: to ship insured requires air freight and that can add a hefty US $10+ to the price. I believe some kind of variation of these rules applies to any non-US country. -gn.