Nikon 7296 Monarch ATB 12x42 Binocular a video by nanangkrstnt3 on Flickr.
Lewat Flickr:
amzn.to/MaFZjc The twilight factor is calculated by taking the square root of the product of the magnification and the aperture.
www.amazon.com/gp/product/B0033PRQBK/ref=as_li_qf_sp_asin...
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