The last two weeks had some clear evenings, so I could test the Mighty Mak. Long story short: I returned it today to the retailer.
As said in my previous post, the images at daylight objects were not as sharp as I expected. The views through my 3,5" APO were much and much sharper. Also the contrast was not overwhelming so to say, thereby strongly reducing its potential use as a spotting scope. This is being caused by, offcourse, the central obstruction, but also the shiny (little) baffletube and inside of the OTA.
After these first impressions I checked the collimation and adjusted it, it was a little off. After that I've conducted some startests, using high quality eyepieces and diagonals (the included diagonal and K25 eyepiece are of low quality). The startests showed a large amount of coma (misalignment of the optical train?) and more spherical abberation then I wished for. It was very difficult to get sharp stars and a lot of fainter stars (e.g. in the Double Cluster) were 'missing'. Also the images missed brilliance and stars were very dull, not sparkling.
I decided to contact the retailer about my findings. The answer I got was that I'm expecting too much from this 'beginners-telescope', so swapping my OTA for another one wouldn't solve the problem. So, all-in-all I decided to go for the refund. Too bad, because with good optics, this could have been a nice travel-scope, although handicapped by its lack of contrast.
After my experiences with this Mighty Mak and a Celestron C70, I used to have, I will stay away form these tiny maks. Nice and compact, but optically not satisfying. Isn't William Optics coming with a nice 61mm FPL53 doublet this summer ?
Edited by Edwin, 25 April 2017 - 01:32 PM.