Sky Mentor 2" Extension Tube with Canon EOS M48 T-Ring - TA16 vendor-kowa Besides offering a flat field

Besides offering a flat field and great correction for chromatic aberration

Mrror blank is polished to 1/10th of a wavelength

Celestron CGEM II 925 SCT - 9

so if you see a bright object close to the ecliptic that is not shown on the map you can be sure it is one of these planets

Sky & Telescope)

Sky Mentor 2" Extension Tube with Canon EOS M48 T-Ring - TA16 vendor-kowa Besides offering a flat fieldThis metal 2" extension tube comes with a M48 EOS T Ring, making it ready to connect to your Canon EOS camera and telescope to do prime focus DSLR photography. It is especially handy when used with a Newtonian reflector. The telescope side of the adapter is threaded to accept standard 2" filters. The inside of the adapter is blackened to minimize reflections.