Popular Articles
  • Digital SLR Astrophotography

    Digital SLR Astrophotography

    This tutorial covers the methods I use for astrophotography with my Canon XSi digital SLR and Celestron CGEM. It is similar to the tutorial I wrote in December of 2007 for digital SLR astrophotography with my Canon 300D. With the exception of the Orion ED80 refractor, I am using all new equipment. I am also using different software for processing the RAW images into a detailed composite photo. Note that Read More
  • Astrophotography on a Budget by Martin Cohen

    Astrophotography on a Budget by Martin Cohen

    Many years ago, before digital photography revolutionized the medium, taking a beautiful shot of the Andromeda Galaxy (M31), or even a detailed image of the moon, showing its many craters, rilles and mountains would only be possible if you had a large wallet and access to highly specialized equipment and techniques. For the average amateur astronomer it was entirely out of reach. With high-end telescopes now being mass produced, new Read More
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Roll-Off Observatory Plans

SkyShed plans provide you with all the information needed to construct an easy to build, attractive and fully functional roll-off observatory. 95% of materials are available from your local building materials retailer.
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NexRemote Telescope Control for CGEM

My review of the Celestron CGEM continues. This article is dedicated to my experience with NexRemote telescope control. This is the first time that I have ever used NexRemote and some things were a bit tricky. But after figuring it out, I thoroughly enjoyed using it! So I hope to provide some helpful hints on getting you started using NexRemote.

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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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Celestron CGEM Review- Part 3

Part 3 of my review covers polar alignment of the CGEM. I actually used two different methods. First, I just had to try the new “All-Star” polar alignment routine that Celestron has been touting. Then, I fine-tuned it with a standard drift align.

To get set up, the polar axis of the CGEM must be pointed close to the celestial pole. Since I’m in the northern hemisphere, I pointed it toward Polaris, the North Star. The first step though was to set the latitude scale of the CGEM. This is a simple adjustment to the latitude adjustment knobs.

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