Astro-Physics A1008-A 2.7" Thread-on Extension
2.7" Thread-on Extension
This extension is provided with Astro-Physics refractors that have the 2.7" focuser. It is for use when observing straight-through without a diagonal or when imaging without a prime focus field flattener. [Note that this extension may be too long except for special applications.]
This extension has a net spacing distance of 2.55" (64.8 mm).