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Celestron SkyMaster vs Opticron Adventurer II WP
The Celestron SkyMaster 15x70 is a reasonably good Binoculars for people with about $80 to spend.
The Opticron Adventurer II WP 8 x 42, by contrast, is quite unremarkable and doesn't manage to stand out in any way when compared to other products at that price point.
In either case, we suggest that you first check out a few other options at the $80 budget - it's likely that you'll find some better alternatives.
However, if you nonetheless want to learn more about the Celestron SkyMaster 15x70 and Opticron Adventurer II WP 8 x 42, here's a summary of what we know:
No sources that perform objective hands-on testing have deemed the Celestron SkyMaster 15x70 worthy of being included in their Binoculars roundups, which typically isn't a good sign.
As for the Opticron Adventurer II WP 8 x 42 - it wasn't considered to be a good enough purchase to earn a spot in any roundups conducted by sources that perform objective hands-on testing, which typically indicates that a product isn't worth its asking price.
As a last step, we wanted to do a head-to-head Celestron SkyMaster 15x70 vs. Opticron Adventurer II WP 8 x 42 comparison of their review performance but, unfortunately, weren't able to find any review ratings on either product.