When considering buying any thermal it is more than just price and similar specs. Because on paper two germanium lens would be the same but you have no clue on what type of germanium lens they are using; commercial grade or milspec. Commercial grade can easily filter out anywhere from 15% to 30% of the heat radiation. They are also not perfectly symmetrical, hence most of them have fixed focus. Milspec on the other hand cannot filter out more than 5% of the radiation and are perfectly symmetrical and in most cases manual.
Second, would be the sensor. You have so many companies now in the thermal market making sensors that just measuring pixels is not good enough.
lastly I personally think the display is also very crucial. LCD vs amoled, 640x 480 vs 800x600. There are companies now producing 720p displays.
Lastly the battery. Is it internal or external? Field changeable or not.
I hope this helps.
ATN Corporation, USA The Future of Optics www.atncorp.com
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