This past holiday, I received a Celestron CGX for Christmas. You might have seen photos of it pop up on some of my other equipment pages. I knew, once I upgraded from the Celestron AVX to a mount with more capacity, it was only a matter of time before a large aperture scope entered the picture. Introducing the EdgeHD 11” Schmidt Cassegrain from Celestron. I picked up this scope second hand from a person I work with. They had been ready to upgrade to something even larger. For me, though, moving from a 6” RC to an 11” SCT is quite a jump.
Initially I only had a chance to do some quick visual work with it. The views are impressive. Outside of their renowned optics, the focuser and mirror flop are two things the Edge scopes are burdened with that are less than stellar. As you focus to the inside and outside of the focus range, there is slop in the mechanics that cause the mirror to flop from side to side. The only remedy, is to lock the mirror down, and attach a new focuser to the back of the scope.
The software ships with all Celestron Skyris astronomical cameras, powered by The Imaging Source. Using iCap, you can do the following: Set all camera parameters. See the live image data stream from the camera. Snap singular images from the camera and save them as BMP or JPG files. Capture image sequences and save the single images as enumerated BMP or JPG files. Installing the card reader software gives your system the ability to exchange data with supported memory card. This software provides compatibility with cards such as MMC, SD, SDHC, micro SD, and many others that can be used with more info. If I check software updates on the Celestron Support page, the only firmware updaters I see download into.exe files, which imply running on Windows. Where are you getting versions that can run on the Mac? I also have Parallels on my Mac, so can run Windows 10.
I’m addressing the focuser with a Moonlite CHL 2.5” Large format Crayford Edge focuser. Moonlite has a low profile focuser that works in tandem with the EdgeHD 11” .7x reducer. Reducing down to F7 from F10 will enable me to image at twice the speed for the same signal to noise ratio. The .7x reducer is not only going to aid in imaging time, but also aid in keeping the mount accurate. I think the native 2800mm focal length might be a bit much for the CGX during long duration guiding, and I’ll only reserve that native length for bright planetary objects that don’t require quite as accurate tracking.
The big benefit of having a large aperture scope like this is that I can begin to image small galaxies and planetary nebulas that were just a bit too small on the 6” scope. I’ve got a dew shield, dew heater, .7x focal reducer, and Moonlite focuser on order. In addition, I added the ZWO Off-Axis Guider for guiding, and the ZWO ASI174MM-Mini guide camera. Longer term, I’d like to try out a new imaging camera like the QHY16200A, but the price of the camera and 2” filters are keeping it out of reach for a while. So to keep the budget down, I opted for a color camera, the ZWO ASI071MC-Pro. It’s currently the largest sensor ZWO puts out, and while the pixel scale at .5 arc seconds is a bit small, it will require extremely good guiding.
Celestron First Light Software Download
Out of the box, the CGX performed admirably. The CGX total RMS for my first night out was .7 arc seconds of error. Quite good with no tweaking. I suspect I can keep it low with some effort and improve it as so long as seeing is adequate.