Coco wrote:I see the Skywatcher dealers are going ahead with selling this Skywatcher Esprit 100 f/5 scope despite rumours of its poor performance now abound, I have sent several emails for clarification to one well known box shifter and after 3 none replies gave up.
I personally take great comfort in reports such as yours Greg, I feel you genuinely wanted/expected to find an affordable gem in the Esprit, I feel sorry for those who will get suckered into buying it.
Darth-Takahashi wrote:I feel like I must defend the honour of the Sky90 a little here. I owned the Sky90 MKII SV version made for the US market. Bought it directly in Japan and imported it myself, hand carried and never bumped etc. I have never had any trouble with it mechanically or optically and I have never collimated it.
Now the main issue with the Sky90 is admittedly first it price and secondly its expected performance as an astrograph!. These short tube flourite doublets are little mini wonders but they definitely suffer from coma at the edge of the FOV. So on an APS size sensor you are definitely going to notice it. When using the reducer there is also little back focus and room for error, so its also quite difficult to use correctly as an astrograph also.
In the end, I returned it back home to Japan where I traded it in for the BabyQ FSQ85EDX which suits my purposes much better than the Sky90 did. Still, I have to say that I enjoyed owning and using the Sky90 and wouldn't hesitate to recommend it, especially if you can pick one up used on the second-hand marketplace, this is when it becomes a bargain; but please understand its limitations.
No telescope is free of optical aberration, not even the famous RC (Ritche Chritein). The real question is how noticeable is the aberration?
The Sky90 is an excellent compact, light-weight and quality flourite doublet but coma is present in the last 10-15% of the FOV, along with high contrast sharp views of the universe.
Can Sky Watcher match the quality of the big names suppliers - NO. Can they get close enough that no one will care about the difference, PROBABLY. Its already happening, GSO are now making affordable RC up to 12" in diameter, something that was thought to be too difficult to do?
We are all privileged to live in these times of affordable quality optics.
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