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The Armasight Zeus 640 75mm delivers a very nice image at the cost of weight and bulkiness. The Armasight Zeus line is a 'barebones' thermal scope without all the functionality that can be found in similar products from say ATN or Pulsar. I found the button system on top of the scope to be clunky to use and the buttons require pressing relatively hard to get them to work. The Zeus 640 75mm is, however, built like a tank, so if this is your number one concern rather than having a myriad of features, you won't be disappointed. The "HD" lens that come on this Zeus now, and from what I understand, all Zeus scopes manufactured in the last year or so. provides a better picture I am told over what Armasight previously used for the objective lens. I have only looked through this newer lens version so have no firsthand experience in this comparison. Please note the scope no longer looks exactly like any pictures you readily find of the internet. The Zeus now has a different objective lens housing and focus ring and comes with a different lens cap (I didn't care for the style of lens cap it now comes with which 'dangles' when removed). All said, it's a solid scope that performs well and doesn't appear delicate, but don't expect it to internally record video or connect to your phone or have stadiametric range finding. Also, with FLIR buying Armasight, the future of the Armasight Zeus line is more unknown and whatever the support quality has been in the past, it may change with t