This image session was a quick test of my ZWO OAG-L installation and setup.  It is replacing my previous separate guide scope and I was anxious to give it a test drive.  The biggest hassle with OAG's is getting the focus right/matched to the focus of the primary OTA imaging train.  In this instance, the back focus is so narrow with the ZWO components, I had to adjust the prism upward about 50% of the distance to the top just to get 'inside' the focus range with the ZWO ASI290MM bottomed out after all the extension/protector rings were removed from the camera body.  There is no chance of intruding the prism into the light path of the APS/C sensor on my ASI2600MM camera and I don't believe it would impact a full frame sensor either.  It does make me wonder what I'm doing different considering all the conversations on CN about the prism being an obstruction on full frame sensors.  ???

The M33 image is an LRGBHa from one night, so the data sets for each filter were fairly small (only 10 in the instance of Ha).  I was quite pleased with the guiding performance of this setup, although still working through some mount issues for the MyT.  I still had the external guidescope mounted, so still had the effects of that weight/moment arm on the mount.  Hoping ot have some clear nights soon to test the 'clean' setup.

UPDATE:

I updated this final image after 2 more nights of data acquistion, plus an upgrade to my rig by adding an ASG Photon Cage which I used with the Hocus Focus Aberration Inspector in N.I.N.A. to adjust my sensor tilt.  In addition, PixInsight has released some significant upates to several tools in the interim, including WBPP script and the addition of a new color correction tool - the SpectrographicPhotometric Color Correction (SPCC).  The current final image is the beneficiary of all these changes, which I think resulted in some significant improvement.  Please enjoy and let me know what you think.

M33, the Triangulum galaxyThe Triangulum Galaxy is a spiral galaxy 2.73 million light-years (ly) from Earth in the constellationTriangulum. It is catalogued as Messier 33 or NGC (New General Catalogue) 598. With the D25 isophotal diameter of 18.74 kiloparsecs (61,100 light-years), the Triangulum Galaxy is the third-largest member of the Local Group of galaxies, behind the Andromeda Galaxy and the Milky Way. It is one of the most distant permanent objects that can be viewed with the naked eye.The galaxy is the smallest spiral galaxy in the Local Group (although the smaller Large and Small Magellanic Clouds may have been spirals before their encounters with the Milky Way), and is believed to be a satellite of the Andromeda Galaxy or on its rebound into the latter due to their interactions, velocities,=10.5px and proximity to one another in the night sky. It also has an H IInucleus.

Wiki link: Triangulum Galaxy - Wikipedia