The following review was entirely unsolicited.

Newtonian imagers rejoice!  You now have the option to easily convert your scope into an ultrafast RASA-like imaging beast without spending all that cash.  Starizona now offers a 0.75X focal reducer/field flattener called Nexus, and it is amazing.

After hearing about this new piece of kit at Nightfall 2021 and seeing images here at Astrobin, I decided to try it on my Orion 10" f4 Newtonian Astrograph.  Since I presently have a 90MM tall PrimaLuceLab Esatto electronic focuser on this OTA, I was initially concerned it would not be at the correct distance to focus.  To my relief, I dropped the Nexus with camera attached into my Esatto, aimed at a distant terrestrial target and found it was almost perfectly in focus.  (I counted myself lucky since the Esatto only has a 15MM range of travel!) 

The Nexus converts my 1000MM 10" f4 reflector into a 750MM f3 light bucket.  The first thing I noticed was the vastly improved signal to noise ratio at this speed.  Each frame was virtually noise free.  While I used 4 minute narrowband subs for this test, I could easily shorten the exposure time without sacrificing quality.  The next thing I noticed was the details.  The image was easily as sharp as or sharper than the refractors I own.  

I'll let that sink in.

An $800 Newtonian scope equipped with a Nexus can rival the image quality of much more expensive telescopes, while capturing images in much less time.  The above image was completed in less than 5 hours on a single night.  I usually take two or three nights to capture HOO or SHO narrowband targets to obtain a decent quality image with my other scopes.

There’s one minor issue.  When zooming in, stars at the corners are slightly out of round compared to those at the center of the frame.  While I might be able to improve this by making slight changes to the backfocus distance, this small issue does not detract from the otherwise improved image quality and time savings I'm getting from the Nexus.  Pixel peepers out there may feel otherwise.

Like having a RASA, one can capture high quality images in a few hours with the Nexus.  It maximizes one's valuable dark sky time and, for me, it also brought back some joy to this hobby.   I’ll just say it. Capturing narrowband data over multiple nights for one target can sometimes be a drag, especially when the weather won’t cooperate.  If this resonates with Newtonian imagers out there or those considering a new setup, take a look at merging a Newt with a Nexus.  It’s a powerful combination with a big return on the investment.