Congrats on your new purchase. Having several pairs of bino from 12X50 to 25X100 in my inventory I am able to experiment with different combination of magnification, exit pupil and FOV for star gazing.
I've found that I enjoy the darker sky background in my binos with 4-5mm exit pupil from my sub magnitude 5 backyard. I also enjoy using higer power binos as long as the objects I am viewing fits comfortably in the FOV. Orion used to stock both 16X80 and 20X80 model Japanese binos several years ago. FOV of the 16X and 20X models were both listed as 3.5 deg. The Orion Megaview 15X80 also had the same 3.5 deg FOV.
Since those 15/16X 80mm models did not offer a wider TFOV than the 20X I elected to go with the 20. Looks like your 16X80 Vixen has wider 4.3 deg FOV. That means you can cover ~50% more sky AREA compared to 3.5 deg. Should be a good combination of FOV, maganification and exit pupil if you have a chance to observe from dark sky locations.
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Re: Update: Very Short Test on Vixen 16x80 Binocul
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