Quote:
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Originally Posted by Dujon
I'm tempted to buy a cheap unit, such as the one you mentioned, just to get an idea as to what I might gain from a decent Barlow.
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That sentence contains a contradiction.
There is no
cheap barlow that I feel offers
decent performance.
IMO you are far better off buying a good 1.25" barlow instead of a mediocre 2" unit.
Cheap barlows such as those made by GSO have inferior lens coatings, resulting in light scatter and reduced contrast. This is noticeable when viewing the moon and bright planets as a bright background and gives a view analogous to driving at night with a dirty windscreen.