M51 first light with multiple new gear

Clear skies to all and welcome to this update.

My telescope focal lengths are really oriented toward capturing Milky Way vistas. But, I recently saw some fantastic images posted on the Astro-Physics users group with relatively short focal length scopes that were lengthened by the new Astro-Physics Advanced Barlow. So, I thought it was worth a try to expand my imaging target capabilities into the heart of galaxy season while waiting on the summer Milky Way to rise.

Another piece of equipment also saw first light on this night, the ZWO ASI 294 MC Pro. Quite simply, I needed a cooled camera for hotter summer night to improve signal to noise. I don’t have time to process LRGB images, so I am pretty much a one shot color guy. I, also, don’t want to mess with a laptop in the field or even at home. That is one of the main reasons I went with ZWO, the company makes the ZWO AIR to communicate directly with the camera via iOS apps on phone or iPad.

One other note on equipment is that I had to use my only UV/IR blocking filter available at the time which was via my Astronomic CLS-CCD filter. I now have a Baader UV/IR luminance filter.

130GT on Mach1GTO mount with Advanced Barlow, ZWO ASI294 MC pro, and Baader variofinder with SG-4 guide camera.

130GT on Mach1GTO mount with Advanced Barlow, ZWO ASI294 MC pro, and Baader variofinder with SG-4 guide camera.

I accumulated 3 total hours on M51 on April 10 with 12x15 minute sub exposures.

I am very happy with the image scale and resolution capabilities that the Astro-Physics Advanced Barlow provides with my AP130GT. This setup really opens up a new library of astronomical objects for me to image.

You can also see the image at astrobin with detailed capture information.

New camera...new focal length

My current imaging setup had two deficiencies; short focal length for galaxy season and non-cooled camera for hot nights.  

The short focal length deficiency has a compromising, but effective remedy. Astro-physics updated their Barlow to the Advanced Barlow which is more corrected for photography with APS C sensors. The 2x Barlow provides a flat field across 80% of the sensor.  

The non-cooled camera was solved by the new ZWO ASI294 MC Pro. A cooled CMOS sensor in a 4/3 format which matches well with my Canon T5i.  

Main reason for this camera... 

  1. one shot color. I don’t want to mess with multi-filter images. 
  2. 14 bit dynamic range
  3. ability to control via WiFi on iOS device via ASI Air.  

First test of this setup was last last week with excellent results. I was able to achieve a nice image scale on M51 that I believe is better than simply enlarging a shorter focal length image.  

And I LOVE utilizing the iPad for image control of the camera!!!!!


Cave Nebula: Sh2-155 in Hydrogen Alpha light

Increasing my imaging time was a top priority this winter. So, many experiments have been conducted with narrow band and light pollution filters from my backyard. It has been many years since my days of narrow band imaging with an SBIG ST10 and Halpha filter.

From the zenith to the south I have fairly decent skies. The further north of the zenith the lights from Huntington start to be a problem.

I know that a modified DSLR is not very efficient for narrow band imaging, but it is what I have decided to use for multiple reasons and so, it is what I have. I think with enough data and drizzle techniques, the camera is quite capable of doing narrow band imaging.

The image acquisition details are as follow:

  • AP 130GT with .75 telecompressor

  • Astro-Physics Mach1 GTO mount

  • Modified Canon T5i

  • Astronomik Hydrogen Alpha 12nm CCD clip filter

  • 24 exposures x 15 minutes each for a total of 6 hours at ISO 1600

  • Data acquired 10/18/2018 and 12/17/2018.

First Light....Astro-Physics 92mm Stowaway

Anxiety runs high when testing new glass and astrophotography configurations. I received the new AP Stowaway in December and have been assembling required accessories for astrophotography until about 2 weeks ago when the final piece arrived, the Canon camera adapter. As always, Astro-Physics pieces are exquisite in design and function.

I needed some time to figure out the proper combination of plates and screws needed to transition my imaging system from an AP 130 Gran Turismo/Baader Vario-Finder quick release bracket/SG-4 guider to the 92mm Stowaway and autoguider setup.

Below, you see the fully assembled imaging setup. (I did eventually change the ring orientation so the ring screws were attaching from the top set of rings).

  • Astro-Physics 92mm Stowaway

  • Astro-Physics .8x telecompressor for Stowaway

  • Canon camera adapter for Stowaway

  • Modified Canon T5i with STC Dual Band in camera h-alpha/ OIII filter

  • Baader Vario-Finder in Astro-Physics Quick Release bracket

  • SBIG SG-4 stand-alone autoguider

  • Two Astro-Physics mounting plates which I can’t remember model numbers!

First impressions…an incredibly rigid and easily transportable setup for powerful astroimaging. Being a mobile imager, it is important to have a setup that can be erected and disassembled in an efficient manner and likely all in a 24 hour period. My back really appreciates a compact and lighter setup, too. The imaging system rides atop the Astro-Physics Mach1 GTO. I can carry the entire imaging scope and autoguider scope in one piece and place atop the Mach 1 with no trouble. The imaging system is now ready for the summer Milky Way season and star parties. Send me an email if you have any questions about mobile imaging.


On March 23 I had a slim window of opportunity between clouds and before moonrise to capture some first light. The winter Milky Way is quickly descending into the west and my setup is really oriented toward Milky Way photography. So, I had a brief target window for the Rosette Nebula as it was post-meridian by end of astronomical twilight.

I was hoping for a full two hours on the Rosette, but only recorded 80 minutes due to increasing high clouds. The image below is a slightly cropped version of the Rosette nebula from the evening. I have really grown to like the dual band Ha/OIII STC filter from my light polluted neighborhood. The single frames of 20 minutes at ISO 1600 have very nice signal to noise on chilly evenings. The image was processed with Light Room, Pixinsight, and Photoshop.