Fun the Megrez 110ED.
- Recently, I've had the pleasure to enjoy a couple of neat ED
A William Optics Megrez 110ED F/5.95 and a Sky-Watcher ED120 f/7.5.
While the Sky-Watcher is a scope which provides very fine optical
quality in a minimalist and somewhat
maligned OTA, the Megrez is a veritable jewel in comparison. The
white powder-coated tube,
gold trimmed sliding dewshade and impeccibly made dual-speed focuser
make the Megrez one of the
prettiest refractors on the market. Gorgeous, precise and built like
It's stubby length, with 10mm less aperture actually weighs about a
pound more than the ED120 tube.
The objective lens sports "STM" coatings, which look very efficient.
Hardly any light is reflected from each
surface of the air-spaced doublet lens.
Since the scope has a very fast f/ratio for a doublet of it's
aperture and uses FPL-51 ED glass (rather than
lower dispersion FPL-53), it does show more spurious color than the
On either side of focus, stars sport green or reddish tinted
fringes. At best focus, there's virtually no
spurious color visible. Although poor seeing does allow glints of
green or red to flash into view, even when
the image is sharpest. This is definitely a scope which benefits
from steady seeing.
It also greatly benefits from the Crayford's 10:1 fine focus action.
You really appreciate that precision to exactly "dial in"
the sharpest, most color-free star images.
Yes, the scope is sharp. It showed well defined stellar diffraction
images, even at the highest magnifications.
Castor at 241x was very impressive. Collimation was excellent, no
astigmatism or coma either.
Saturn showed a glorious view at 131x and 160x.
Mars was... well, not so amazing. Surface marking looked faint and
diffuse. The mediocre seeing wasn't helping.
Other things I enjoyed about the Megrez:
The 2" Dielectric diagonal was very bright and well collimated.
This was also the first time I'd used a RDF (red-dot finder). It
must be an acquired taste. This one was accurate and
worked well, but I just prefer a conventional finderscope.
Overall, the Megrez 110ED is a fine refractor and a very neat
It's chief limitation is slightly-less-than-apo color correction
which is to be expected in an FPL-51 doublet of that aperture and
focal length (no miracles here).
A pleasure to use, a joy to look at and a scope to proudly own.