This is a 1 year old visual back deep sky filter that has only been used 2 times. It will fit the threads of SCT's. The Deep Sky Filter blocks the mercury and sodium vapor lamp emissions while letting through all other parts of the spectrum. Useful for film astrophotography and CCD as well as visual applications.
Sold new for $199.50, Yours for only $150 plus $6 shipping any where in CONUS. FEDEX 2nd day. Postal Money order or certified check.
Thanks for looking.