I intend to start making visual observations, and I want to know more about the difference...

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Physics

I intend to start making visual observations, and I want to knowmore about the difference between using barlow lenses and one ortwo eyepieces and using a complete kit of eyepieces, both forplanetary and deep space objects.

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In general more glass means the image gets worse However if the barlow is good the losses and aberrations are below the annoyance threshold or rarely below even the perceptual threshold Its all in the eye of the beholder anyway Also especially with cheaper eyepieces it is sometimes the case that the more powerful eyepieces have less    See Answer
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