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I brought apair of Barska 15x70 about 2 years ago. I had to test 5x in store before I got one that was fully collimated. They do have inferior optics and build qualities - Chinese entry level really - multiple ghosting on bright objects and marked field curvature and astigmatism. I have had 3x Skymaster versions - they are an improvemnet - but again 2 of of 3 were miscollimated.
I now have a 'Ultra' 15x 70 these have excellent optical and build qualities. Spend more on Hi quility versions - as the above post suggests. Quality far outlasts the initial pain in your wallet.
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