CGEM Drift Alignment Procedure

This procedure covers the steps I take to perform a drift alignment on my Celestron CGEM telescope. Although the All-Star Aligment routine works really well to get the CGEM closely aligned with the celestial pole, I have found that the alignment needs to be refined further to be suitable for astrophotography. Note that this polar alignment procedure is written for my setup: CGEM mount, 9.25″ Celestron SCT, 1.25″ Diagonal, and 12mm Illuminated reticule eyepiece. The basic concept still applies to other variations of telescopes, but you may have to move your telescope in the opposite direction for azimuth or altitude adjustments.

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Astrophotography Cameras

The focus of this article is to sort out the major classes of astrophotography cameras for those who are brand new to this pastime. Astrophotography is a nice component to amateur astronomy but can be difficult for the beginner due to the extensive variety of equipment involved. We hope to at least get you familiar with the main categories of cameras used for astrophotography.

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DSLR Astrophotography Calculator

When trying to decide on the optimal DSLR and telescope combination, it is important to know how much of the sky will be included in the field of view. Furthermore, it is important to match the focal length of the telescope with the imaging sensor for obtaining the best results.

There is a handy (and free) calculator available that will make your job of matching telescope to digital SLR very easy! Blast on over to Ray Shore’s site for his Calculator for DSLR Astrophotography page. Note that the link opens in a separate window so that the calculator can be conveniently referenced. This article provides the basic concept and instructions for using Ray’s DSLR Astrophotography calculator.

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