GSO 6inch F12 Classical Cassegrain It’s A Winner!
I purchased this scope as my Grab & Go set up with high hope on a budget designed telescope.
The picture below is for testing in my observatory on my CGE Pro mount.
The scope arrived on Jan 4th 2019 at 3pm. So yes I have had it out a few times as of this writing.
I was very happy to receive my new toy a 6” GSO Classical Cassegrain. I can’t believe it’s a new moon weekend with clear skies tonight for testing and 8 Degrees Celsius on January 4th in Canada. WOW! This breaks all the rules of a new Astro toy purchase with the usual two-three weeks of clouds.
I haven’t heard of any one owning this unit in North America, So I might be the only one. And If not probably less than a handful in total are out there.
Talk of the scope I’ll put this all in point form:
-Fit and finish very nice
-Collimation off, will tweak with star.
- Was trying to attach the Vixen to a Losmandy dovetail plate to work with my CGE Pro mount. Only to find out this Vixen dovetail has two tapped hole, one at each end with ¼ x 20 and a center one that is metric with M6-1.00. Who’d da thunk?
-Looks just like a recycled RC but longer tube. Also came in a RC foam insert for shipping.
-I’m happy with 2 speed focuser, only going to do visual and it seems really smooth.
-Need a 2” spacer added to reach focus with a diagonal and an ES eyepiece. So that’s like 6”-7” pass the focuser for focus.
-Very back heavy for balancing.
-Might need some counter weight up front on dovetail to offset my heavy Baader Mark V binoviewer and Badder zooms. This could create a problem if you are near the max weight of your mount.
-Collimating this scope will be a lot more demanding then the average Newtonian scope.
-Baffles probably blocking some of the incoming light so will have to check. May pull out and foam insulate the interior then add flocking to it.
-Tube length with focuser 17” + 3.25 focuser =20.25” plus a 2” spacer for visual use. Tube diameter 7.5”
-Secondary obstruction with light baffle is around 57mm at my best guess. Primary 154mm?
-Bino-viewer with 1.7 glass path needed a 1” extension tube to reach focus.
-Didn’t try it yet but the Badder Mark V Bino viewer should reach focus without the glass path by having the focuser attached directly to the tube. Will report back on this.
-The focuser base is not square to the focuser tube, I’m not happy with that as it will make collimating a problem.
-Images made by the scope seem bright and sharp.
-Viewed the moon at first quarter with the binoviewer working at 400x and views were slightly clearer in the center. The scope performed very well allowing me to see side ledges of the larger craters at that power which equals to almost 70x per inch on a so-so night. 45x per inch the image was tack sharp.
-Viewed Mars which is about 200,000,000 km out right now and put up some nice sharp edges to the planet with no details to be seen on disc. The two speed focuser surly helped.
-Collimation is not hard but needs to be very precise to see the true power of the design.
-Still need to tweak the airy disc ring once I get some good seeing to make this scope spot on.
-Scope should hold collimation very well.
-Reworked focuser by truing up the base to the focuser draw tube.
-Cool down should be quick with little mass and both ends open.
-No tube currants have been notice but it is outside in my observatory.
-Classical Cassegrain have a slight tad of astigmatism and coma very far from axis, so it's usually designed with a very slow f/ratio to mitigate that like f/18 to f/30. This scope is F/12 so you will see more of them both.
-Use this scope for what it was designed to do which is medium to high power viewing and you will be happy.
-Funny thing is most people would think this scope has a small field of view but to me it seemed large compared to my 12.5” F/20 Dall Kirkham with RF Royce optics 6350mm native focal length. lol
Would I purchase again.......... HECK YA! ....... Not only a good price for a good scope but the images are great.
It truly is a Champagne scope on a beer budget as long as you are like me and don’t mind spikes on bright stars, it’s a true winner in my books.