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As I said it was 18 months ago Bintel has dropped there prices and at the time there was a big wait until there next shipment so that's why I went over seas. At the moment you most probably won't save a lot on one especially the cheaper 11/4" units .
As far as the difference between them go to the Teleview site as the explanation there , it is self explanatory.
If you want to do CCD or web cam imaging of the planets there are well suited to it as this is why I got the 4x . No need to use eyepiece projection but that depends on your F/R . I have a couple of other brands of barlows and the power mate ( which is not called a barlow) is far superior.
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