I’ve been thoroughly enjoying my time taking astrophotographs using my Sky-Watcher Esprit 100 f/5.5 apo refractor, ZWO ASI533MC Pro camera, and iOptron GEM45 mount over the past several months. The Sky-Watcher has been a joy to use, yielding sharp views in a field of view that works well for nebula and other larger targets. But with the onset of spring, most of the best targets in the night sky are galaxies–spectacular, but smaller. So I decided it was time to give my Celestron NexStar 6SE a try. Not the mount, mind you–it’s an alt-az mount with a lot of backlash in the motor drives–just the optical tube assembly (OTA). The C6 is a 150-mm f/10 with decent optics. A 1500-mm focal length seemed like quite a challenge for imaging, though, so I added the Celestron 0.63x focal reducer to the mix.Continue reading
Category Archives: Astronomy
Affinity Photo for Astro Image Processing
In astrophotography, using thousands of dollars of equipment to capture images of deep sky objects as you carefully track them across the sky is only part of the imaging process. Equally important is the task of combining and processing the captured images to produce your final astrophotograph. That’s where tools like Photoshop, PixInsight, Astro Pixel Processor, Siril, and even the Gimp would traditionally be put to work. But a new tool is gaining a foothold in the astrophotography world–Affinity Photo. Affinity Photo is just as capable as Photoshop for a fraction of the price. If that doesn’t make it attractive enough, the latest version (1.9) has added some astrophotography-specific capabilities, including the ability to stack astro exposures–a very important task in astro image processing.Continue reading
N.I.N.A, the GEM45 Mount, and Meridian Flipping
Modern astro imaging involves a lot of moving parts, and controlling those parts can be a daunting task for new imagers. For example, imaging a deep sky object involves taking multiple long exposures of the object with a camera that is being made to very precisely track the object while it is being imaged. Generally, the camera uses a telescope as its lens, and the telescope is mounted on an equatorial mount that is motorized and/or computerized so that it tracks the motion of the object very precisely as it moves across the sky from east to west. Thankfully, there are software packages available that will manage much of this complexity for you.Continue reading
Firmware Bug in Latest iOptron GEM45 Firmware
UPDATE: The firmware appears to have been updated to fix this bug. See the note at the end of this post.
The other evening I was doing some imaging using my refractor on my iOptron GEM45 mount, and ran into a bit of a snag. I use N.I.N.A to manage my imaging runs, and I set up N.I.N.A and the iOptron ASCOM driver (iOptron Commander) together to handle the meridian flip needed during the imaging run. But while the meridian flip had worked just fine in previous imaging sessions, this time the meridian flip failed, and I had to manually intervene. But why?Continue reading
Topaz Labs Denoise AI
Post-processing astro images is probably one of the most challenging parts of the astro imaging process. So I’m always on the lookout for tools that can help me improve my images. One tool I recently added to the toolbox is Denoise AI from Topaz Labs.Continue reading
The Rosette Nebula Using an Optolong L-Extreme Filter
This year Santa brought me a new Optolong L-Extreme narrow-band filter to use with my also-new ZWO ASI533MC Pro one-shot-color camera. I recently had the chance to try out this new combination for the first time, choosing the Rosette Nebula in the constellation Monoceros as my first target.Continue reading
Imaging the Orion Nebula Using My New ZWO ASI533 MC Pro Camera
One of the gifts I received for my 60th birthday was a dedicated astronomy camera–the ZWO ASI533MC Pro. One of my first targets for this new camera was the Orion Nebula.
Updated ASCOM Driver for Digital Setting Circles
At the request of a user, I updated my ASCOM Driver for Digital Setting Circles to include a couple of the northern constellations–Ursa Minor and Draco. These constellations were added because the user had a limited view of the sky and needed more northerly stars on which to align. However, in general it is better to choose alignment stars that are not so far north (or south).
The download link for the driver installation file has been updated on the ASCOM Driver page.
My First Astro Imaging Session
Finally. I’d been waiting for weeks for an evening that would provide decent enough conditions for me to attempt my first imaging session with my new telescope, camera, and mount. Between clouds and smoke from forest fires, I’d been stymied for quite some time, but last Thursday evening finally presented clear skies and a little dark time before the moon rose so I could set everything up and try some long-exposure imaging of deep sky objects.Continue reading
William Optics UniGuide Scope with ZWO ASI290mm Mini Guide Camera
In my quest to put together a decent starter package for doing deep sky imaging, I purchased a William Optics UniGuide 50mm guide scope and a ZWO ASI290mm mini guide camera to use for guiding my main telescope during imaging. Both appear to be fine pieces of equipment, but when I did some bench testing I discovered that in order to bring images to focus in the ASI290mm mini guide camera, it had to be positioned in the guide scope such that it was just barely inserted. Some additional length in the guide scope would be a good thing.Continue reading