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Home > Classifieds > Astromart Classifieds > Filters > Classified #197652

For Sale: UltraBlock (2") {{{ SOLD }}}

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{{{ Sold, thanks John }}}
I have for sale a 2" Orion UltraBlock Narrowband Filter.
Dramatically improves views of emission and planetary nebulae.
Blocks all forms of light pollution - mercury vapor and sodium emission bands - while passing the critical hydrogen-beta and ionized oxygen wavelengths. With an UltraBlock, emission and planetary nebulae "surface" from the washed out background sky. In dark skies, the UltraBlock also enhances the sky presence of a significant number of fainter deep-sky objects over unfiltered and wideband-filtered views.

The filter itself is in excellent condition. The top edge of the filter cell is scuffed where it contacts my filter slide - see photos below. I really like this filter, but it is too tall to fit into my filter slide. It works wonderfully when screwed onto individual 2" eyepieces.

Orion sells this filter for $90 plus shipping.
I'll sell this one for $55 shipped via Priority Mail to any address in the CONUS. Will ship outside the US if you pay the postage. Includes plastic case, box, and paperwork showing filter wavelength scan.
This filter's graph indicates 5% transmission at 470nm, peaking at mid 90% from 480nm to 515nm, 50% at 520nm and 3% at 530nm.

PayPal preferred (no additional fees).

Thanks for looking!

Peter
 

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