Originally Posted By: Zoomie86I think clip ons are very cool, but they arent always the best solution. The whole idea of a clip on is a two edged sword. It solves one problem, needing more than one scope/rifle. However, it causes other issues. For light amplification type scopes, they add another layer of glass to reduce image quality and they all add weight to a rifle! The pvs 27 is over 3#'s! Add that to a 2# scope and mount equals one heavy rifle

With the thermal type clip, you still have the issue of weight. A recoil rated scope is still at least a 1.5#+ and the weight of the scope and mount. However, the thermal is a day night optic, unlike the light amplifying scope. If your dedicated to thermal only hunting, why use a clip on? Only one rifle maybe a good reason, but I doubt that applies

Also,with thermal, everyone writes off the older technology. The cooled scanner is a superior optical performer to the uncooled. The medium pas-13b out performs the Flir t-75; it has 2 optical magnifications 1.66x and 5x and can id a man at 1400 meters. At 1.66x its fov is 18 degree. Preaty awesome! The heavy weight has twice the ability of it

However, they are heavier and used special batteries. I guess life is a trade off
Good post. Indeed, it's always a trade off and wish there was one device that was perfect. With that said a dedicated system like the new IR Defense MKII's with the 12um cores are pretty stunning.
http://tnvc.com/shop/ir-hunter-mk-ii-19mm-thermal-scope-640-x-480/
http://tnvc.com/shop/ir-hunter-mk-ii-35mm-thermal-scope-640-x-480/