Question about Optics
That scope came with a 25 mm and a 10 mm eyepiece, which will give about a x40 and a x100 magnification respectively. If the seeing is good (clear sky, not dusty or windy, and the planet not too low (at least 30 deg up from the horizon) you should get a reasonable view of the planets, with these ep's
If you do not have any ep's you could buy 2 or 3 plossl type ep's (nothing more expensive is justified) of say 10 mm, 25 mm, and 32 mm. It looks like it takes ep's with a 1.25" barrel.
The theoretical limiting power of your scope is about x 220, which is about a 4 mm eyepiece, but at that extreme you will find the viewing object is dim, fuzzy, hard to get into the field of view, hard to focus, and totally frustrating.
Sadly this scope is just not a very good one, sorry to sound elitist. One of the issues will be that of collimation (optical alignment). You can never properly focus the scope unless it is collimated. Reflector scopes (with a mirror) all have this difficulty. You can tell if it is collimated with a star test
There should be 3 screws on the bottom end of the scope, where the mirror is. These are the collimation screws. Have somebody screw these in and out while you look through the ep. Remember you can only assess the collimation when the defocussed star image is right in the middle of your view.
Posted on Dec 12, 2016
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Posted on Jan 02, 2017
Any of these will work, 1.25 inch measure the hole in the telescope.
Posted on Sep 25, 2009
I would not feel too disappointed. The RX-9 is not a large or powerful telescope (sorry) and is therefore not capable of huge magnification without loss of clarity. The largest practical magnification for this scope in a dark-sky site would be about x225, which would be about a 4mm eyepiece. Such an eyepiece is in fact difficult to use unless it is a very expensive wide-angle type. They can cost $500 just for the one EP. The EPs you got with the scope will not be in that league, being cheap "Plossls".
If you are in the suburbs, you will also have a lot of light pollution, or sky-glow, and this makes it even more difficult to see a sharp image. The best image available may not be enough to see the bands, let alone the GRS. In the burbs you may only be able to use a max magnification of x90 , or about a 10mm EP.
Bear in mind that ultra-high magnification for visual observing is pure advertising nonsense, for all but large observatory scopes. Those lovely pictures you see are the result of long, heavily processed time exposures with a sensitive camera. You won\'t see that with the naked eye, especially in the burbs.
In addition to all that gloom, the GRS is not always facing us here on Earth. Here is when you can expect it to be visible
Posted on Nov 28, 2012
700mm FL with an aperture of 60mm gives you a focal ratio of 11.6, so you shouldn't even try using any EP with a FL shorter than 11.6mm, which mean only the 12.5mm would be of any use. Unless you can find a pitch black area with 0 light pollution and excellent seeing, then you could perhaps still get away with the 8mm.
So with the 12.5mm, you're talking about a 56X magnification, so it would be rather hard seeing any details on the planets. You should be able to see Jupiter's moons (tiny dots) and Saturn's rings though.
Posted on Aug 17, 2016
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