So, do you recommend a MN86??
Many years ago, a very good friend ( and local telescope dealer :-) ) of mine was able to get a set of EQ6 + MN86 for a ridiculously low price somehow, so for a few months I had a 10" SCT and the MN86 simultaneously; and I found that the MN86 knocked spots off the SCT in almost every way. It is rugged, stable, has a large, flat, focal plane ( my Canon Eos 7d does not see any vignetting with the chip at 22mm across), minimal secondary obstruction, and the imaging was crisper from planetary to DSO.
The only disadvantage was the lack of back focus,.
These are the notes I took at the time.
..."This is the most amazing telescope I have ever had the honour of owning - it outclassed the 10"f10 meade in all respects with the exception of having limited backfocus - and I mean limited. My cheapy kelner 35mm eyepiece cannot even reach the focal point. I had to fit my 2" barrel mounted CCD device ( my starlight Xpress cameras ) inside the crayford focusser to reach the focal point - extremely annoying. The purchase of a DX1 low profile focusser was neccessary and even then there is not enough room for a filter wheel.
See here for how little backfocus there is when the camera is at the focal point.
It is solidly built ( very solid ! ~ 20kg of solid ) - all the screwthreads are metal with plastic endings, ( the meade had awful cheap plastic screws which don't hold tight & wear very easily.). It is well baffled , has a very small central obstruction, has a mirror fan and most importantly provides razor sharp images, easily outperforming my 10"SCT for planetary and deepsky observations.
On the first night I set it up we observed jupiter , m13 and m57. With a 4.8mm nagler I could achieve total focus on all 3 objects , which I could very rarely do with the meade, even with excellant seeing conditions. I could visually see patterns within the bands of jupiter . M13 was truly stunning, and the only way to describe M57 was to compare it with the b&w image I have in my gallery. I couldn't quite see the central star but the ring was clearly in focus, I could see differences in the structure of the ring and it appeared in sharp clear contrast in b&w ( a wonderful example of how eyes are more sensitive in b&w ( night vision with rods ) than colour)."
So to answer your question, *at the time* - I was able to get a MN86 at a seriously rude price; and it was, and still is, a truly remarkable performer - however I see they are now selling for ~£3-4k. If that is correct, then there are other options I would strongly consider ( 12" truss RC etcetc ), but if you can get a 8" mak newt for ~£2k, then in my opinion a bomb proof, optically high quality astrograph such as the MN86 is hard to beat.
Edited by mgn, 23 April 2019 - 03:57 AM.