what is the difference between 4mm and 24mm and 30mm eyepieces? could I buy an eyepiece from another brand? I have the Gskyer telescope.could I buy for Celestron eyepieces?
thanks.
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The 4, 24 and 30mm eyepieces give different magnification (equal to the the focal length of the telescope in mm, divided by the number for the eyepiece). You can use eyepieces from other brands, but make sure they have the same size barrel (the bit that slides into the telescope). I don't know the Gskyer brand, but the eyepiece size will be either .965 inch or 1.25 inch. Provided you get the same size, any other brand will work. It's probably best to get familiar with what is provided by Gskyer before buying anything else.
You will likely find that using lower magnification at first gives the best outcome.
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$\begingroup$ .965 inch size eyepieces are old and not often found anymore. Currently the most popular sizes are 1.25" and 2". $\endgroup$ Dec 14, 2017 at 20:23
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$\begingroup$ so if it is going on increasing of mm.s will it give more magnification or less? $\endgroup$ Dec 14, 2017 at 21:45
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$\begingroup$ @Eng.Sultan : more mm (of focal length of eyepiece) means lower magnification, but wider area visible, and less obvious shake or wobble of whatever you are trying to see. $\endgroup$– Dr ChuckDec 14, 2017 at 22:00
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$\begingroup$ so if I want to see more deep for the moon and other planets should I buy less than 10mm because it's the smallest eyepiece I have.? $\endgroup$ Dec 16, 2017 at 10:02