Question about Optics
When I looked at Jupiter or Saturn with an RX-9 reflector telescope I couldn't see the GRS on Jupiter or Saturn's rings, I used all the powers I had. Can anyone help me?
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
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Posted on Jan 02, 2017
Your 3.5 inch telescope has a maximum magnification of about 170 power.
This is under perfect sky conditions and a perfectly collimated telescope. Galileo used 30 power magnification to see Saturn's rings and the moons of Jupiter!
Put the eyepiece with the largest number written on it into the focuser do not use the 2x barlow if you have one.
Point it at Saturn. You will see the rings. However they are almost slanted directly toward Earth right now. You will only see a thin line going across the planet.
By the end of 2010 they should open up again enough to make out the "ring" shape.
You only need about 50-70 power to view Jupiter or Saturn, or Venus. Mars is smaller and about 100 power to 120 power should permit you to see the disk of the planet (but it's still very small in the eyepiece).
Posted on Dec 29, 2009
SOURCE: wont focus correctly
TOO MUCH magnification. Put the eyepiece with the largest number written on it into the telescope. DO NOT USE the 2x barlow. Try Jupiter with lower magnification.
Posted on Oct 15, 2009
SOURCE: Not really a problem, but
Is this your telescope?
If it is you can forget about 675 power magnification. The maximum magnification for ANY telescope is about 50 times aperture. You have about a 4 inch aperture mirror so 200 power is the highest it will go, and ONLY on perfect nights when the sky is very stable and if your optics are PERFECT.
Most of us only get 30-40 times aperture. You will not see color almost everything is shades of gray. If you are expecting a GIANT view you will certainly be disappointed. BUT-- the scope can show you many objects in the night sky.
Start with the moon and also Jupiter which is up shortly after dark. Download this free monthly star chart and read my tips on my profile page.
Posted on Jan 20, 2011
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