[Carl]

Compatible with f/6 to f/8 refractors as well as Astro-Tech Ritchey-Chrétiens.

• Astro-Tech 2" Field Flattener was a 2010 Sky & Telescope "Hot Product" Award winner!
• Designed to work purely as a field flattener, the 2" Astro-Tech field flattener does not change the focal length or focal ratio of your telescope.

Purchased in November to use with new scope. Have sold scope and no longer need the field flattener. Has been used once only in perfect condition.
Paid $150 US plus shipping will sell for $120 plus postage.