Question about Meade ETX-90EC (325 x 90mm) Telescope
The black dot means you are way out of focus.
In an ETX90 Mars will always be a TINY disk, except under extreme magnification.
Jupiter is also a small disk but a little bit bigger.
Next time you try for Jupiter focus on the MOONS until they are tiny points of light like little stars.
Also certain eyepieces have this as an unwanted trait. Try another eyepiece -- start with the one with the largest number written on it which will be your LOWEST magnification.
Posted on Sep 09, 2010
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Posted on Jan 02, 2017
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