Celestron CGEM Review- Part 1

This is the first of a series of reviews planned for my new Celestron CGEM mount. I had my eye on the CGEM ever since it was first announced by Celestron. Some of the attractive features were its payload, Permanent Periodic Error Correction (PEC), new All-star polar alignment, and its ability to track well past the meridian before the scope needed to be flipped. I received the CGEM on Monday of this week (9/14/09) and had it fully assembled within an hour.

Read More

Jupiter’s Changing Elevation

If you are a planetary astrophotographer in the northern hemisphere, you have probably been frustrated with your attempts to acquire nicely detailed images of Jupiter in the last couple of years. Even if you obtained perfect telescope collimation, allowed your scope to reach thermal equilibrium, achieved critical focus, imaged during the best seeing conditions, etc., chances are you still did not get the results you hoped for.

Read More

Celestron EdgeHD Preview Video

You may have heard about a new and exciting product coming on the market from Celestron. It’s called the EdgeHD aplanatic Schmidt telescope.  According to Celestron, this scope is “designed to produce aberration-free images across a wide visual and photographic field of view”. In fact, the EdgeHD performance is being compared to that of an astrograph when it comes to “coma-free” optics . Astro-imagers cannot wait to see the first reviews come in for this new scope. 

Read More