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Do I need a Barlow lens?


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Hi i'm very very new to astronomy and know very little.

I've just bagged the Skywatcher Skymax 90mm mak, after actually reading the specs i found that the highest practical power is only x180. So with the EP provided (10mm and 25mm) i can get magnifications of x50 and x125, so would i be wasting money on a barlow or would it be more suitable to get a zoom EP rainging from 7-21mm? which would give me x178 to x59.

The EP i'm considering is Sky Watcher 7mm to 21mm zoom eyepiece from pulsar optics; only thing is i'm not sure if i should get a barlow or just use the zoom EP.

please help!!!!!

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