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Originally Posted by khodd
Some of the posts seem to suggest that there are viewing advantages in using a barlow: are there any disadvantages? If you were to use an expensive wide field EP in a barlow would you still get a wide view? Can you use a 1.25" EP in a 2" barlow?
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The disadvantages to using a barlow, namely light scatter and optical degradation can be minimised by choosing a good quality barlow over a cheap one. A cheap or mediocre one will noticeably degrade any eyepiece you care to stick in it. Buy a good one and you are likely to keep it for life
The Orion Shorty-PLUS at around $140 seems to be the universal choice for those wanting a good 1.25" barlow at a not-so-astronomical price. This barlow along with your 15mm plossl and another 12mm one will see you right for planetary viewing
