Optolong L-eXtreme F2 7nm Dual Band Filter for Fast Optics - 2" StarSense This Explore Scientific Generation II

This Explore Scientific Generation II - 20" Truss Tube Dobsonian Telescope is an ideal workhorse for deep sky astronomy observers

This dovetail is 15" long

Fastar Compatible : No

The Petzval design means that finding the perfect spacing is a thing of the past

NOTE: This product also includes a 1

Optolong L-eXtreme F2 7nm Dual Band Filter for Fast Optics - 2" StarSense This Explore Scientific Generation IIThe Optolong L eXtreme F2 is a dual band (500. 7 nm and 656. 28 nm, FWHM=7 nm) narrowband pass filter that meets the requirements for transmission at continuously varying angles. Astronomically characterized spectral lines (OIII, Ha) are the main transmission wavelengths, and the OIII and H Alpha nebula emission lines pass accurately at f2 f3. 3. This 2" L eXtreme filter performs well with RASA, HyperStar F2 and other telescopes with fast optics of f