The big reason to get the 3 instead of the 2 or 3s is the lenses, pancake vs fresnel is a huge difference. Power wise there isn't that big of a difference between the 2 and 3 (and none between the 3 and 3s), but everything will look noticeably better on the 3 because of the higher res displays and lenses. The idea of grabbing a cheap 2 to see if you like it is a decent one though, but if you do like it then just avoid the 3s. The 3 is worth the extra cash
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