SYW / Yamamoto 108 mm / 1600 mm review
Posted 28 July 2012 - 04:40 AM
It's build and optical qualities are to say the least excellent. It has a clear aperture of 108 mm [ 4.1/4 in.] with a F/L of 14.8.
The controls are solid and smooth. It comes on a solid pedestal mount, which I prefer to a tripod mount. The 50mm / 500 mm finder with .96in. eyepieces in it self gives great images up to 80x.
CA is not an issue with normal magnifications. Above 280x - 300x some minor purple color fringing can be glimpsed on the edge of the moon but you do have to look for it. It easily would exceed my old Orion ED100 with CA correction and image quality. The scope is heavy and long, about 170lbs, and about 6ft.+ long - it is about 18-20in. longer then a 6in. F/8 refractor, but it can be broken down to 3x parts for transportation outside. The 1.25in. focuser is smooth and the image snaps into view.
Star tests are text book. Stars are pin point sharp. It takes magnifications in the 200x -300x range well. Last night the seeing was not the best and my Meade 6.7 4000 UWA, which gives 240x, gave the best images of Saturn with surface hues and ring detail easily seen. It does give that 'wow' feeling. It cost about $US1500 equivalent - but for me its priceless - I have been desiring a scope like this for 40 odd years. Not only does it give APO like images, but I also spend half my time just looking at it it - it really is a piece of industrial and optical art.
Posted 28 July 2012 - 04:45 AM
Posted 28 July 2012 - 07:10 AM
Posted 28 July 2012 - 10:10 AM
Posted 28 July 2012 - 12:54 PM
Thanks for sharing,
Posted 28 July 2012 - 09:20 PM
Posted 28 July 2012 - 10:03 PM
Posted 28 July 2012 - 11:14 PM
Posted 29 July 2012 - 01:06 AM
Posted 29 July 2012 - 07:20 AM
Again enjoy the beautiful SYW it is a very rare bird!!
Posted 29 July 2012 - 03:57 PM
Posted 30 July 2012 - 07:30 PM
I have noticed the rear baffle does vignette a few mm's - presumably to reduce any lens edge distortions.
This is more noticeable when the focuser is extended right out. I use a diagonal which reduces the travel out so it is not a real issue. I am aware the Japanese observers tend to use their refractors 'straight through'.
It does need hi quality eyepieces to maximize its abilities I have a few older Japanese Celestron Ultima Possl's which are nice but I will build up a collection of Televue's as well.
Every morning I say good morning to it and then I look it for 5 minutes - my wife think's I am mad !
Posted 30 July 2012 - 09:09 PM
Posted 30 July 2012 - 09:16 PM
Posted 30 July 2012 - 10:40 PM
Posted 30 July 2012 - 10:42 PM
Posted 02 August 2012 - 08:51 AM
I prefer the piers, though I've never had a refractor come with one. It just seems "tidier" on a pier, with less to bump into in the dark!
Anyone have experience with these people? Epsilon piers Their piers look most like what you might find with one of the Japanese refractors, except perhaps for the size, I suppose (I've never seen one, though).[/threadjack]
Posted 27 August 2012 - 02:59 PM
Here is the mystery that attaches to your scope. It sure looks identical to Mikey Cee's Tasco 20TE which we know was made by Royal Astro. What then is the connection with SYW? Perhaps their scopes were Royal Astro rebrands?