A couple of years ago I had the opportunity to take ownership of this scope:
240 F12.5 Mak Cass by Zen Romano. (Costruzioni Ottiche Zen)
Condition of the optics was perfect accept for the coating on the Gregory spot. However, with many parts of the coating missing it still gave a WOW Factor on its first and tester session on Luna. Also owning Intes 10” & 7” Mak newts, I could tell immediately the pedigree of the optics I was experiencing on this scope so decided it was a keeper and one to custom modify.
The Tube build is fabulous and I consider a notch up from the Intes Mak Cass’s. The primary focus mechanism is remarkable and there is ZERO image shift! The collimation is carried out by adjustable push pull screw arrangement around the edge of the rear plate. Once collimated, which is very easy with my Howie Glatter lazer and screw in ring hologram, it stays collimated
The primary mirror and meniscus was cleaned and spot on the meniscus re-coated by Terry at Vacuum Coatings Ltd, UK. I had the carbon Dew shield made by Klaus Helmerichs. It is oversized by a few mm to allow a gap around the tube thus allowing the dew shield to ventilate. I machined a series of ventilation holes at the front of the tube, behind the meniscus to increase air flow from the front, when the rear cooling fan is in operation.
I fabricated a stainless steel handle and added a pair of Baader Finder bases and a Baader 2” Quicklock visual back.
The finish is a custom mixed light grey which I favor as I do the Intes grey.
I condsider this my ‘grab & go’ choice and it rides very smooth on my counterweight modified DM6.
Had it recently on the planets and Luna and regardless of the added Atmospheric Distortion at hand, (UK observing) it exercised precise optics with identical star test images. An ADC is the next purchase! It’s very much like suddenly having my Intes 10” Made portable!!
Waiting for the colder nights and higher elevation of the Moon, in the coming months, to be knocked out! And allow me to compare both scopes side by side.
Reports to follow…..
Edited by Paul C-I, 11 September 2019 - 08:02 AM.