We do comparisons all the time here ... but based on specific requestors use cases ...
At a high level the under $10k game these days is pretty simple:
On the low end: Pulsar
On the high end: Trijicon
I would pass on the ATNs for sure ... and I would also pass on the FLIR/Armasights.
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The Trails are the new model Pulsars and have fancy battery packs and internal video. The older Apex models and nice and simple, get the job done and cost less.
The 640 Trail 50mm has more resolution close in .. but with only 1.6x optical magnification, competes with its less expensive brother the 384 resolution 50mm with 3.1 optical magnification.
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Trijicon has the Mk3 35mm and 60mm ... the 60mm is 4.5 optical magnification and is a great long distance spotter, if you need that capability.
The older mk2 19mm and 35mm are also around and offer the lowest price option to get in to the OASYS cores.
There are also several joystick housing models:
19mm Patrol ... a good spotter and can be mounted side by side with a pvs-14 on your head. Can be a 1x weapons sight.
35mm Reap ... also a good spotter and a good 2.5x weapons sight.
60mm PatrolXR ... the best thermal spotter we can buy ... but cannot be head mounted or used as a rifle scope.
The OASYS cores offer the best image we can get under $10k and maybe period. But the Pulsar cores are not so far behind in terms of image clarity, perhaps 80% to 90% as clear as the OASYS cores depending on distance and conditions.
Hard to go wrong with either Pulsar or Trijicon depending on your budget and image clarity proclivity.
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If you have specific questions ask away !!
