Just got out my cable for the Trijicon, realized I hadn't put the trijicon download software on this computer yet, so I just loaded it and found I had a few pictures of a red tail hawk eating a rabbit she just killed just about 125 yards from my deck. Pictures show 2 things about thermal, how bad the picture can get if there is a ton of water in the air, and how bad digital magnification gets. These pictures were taken after hours of rain, very light mist in the air that was just enough that with the naked eye the trees behind the hawke were not clear, just a bit hazy.
In my previous post I mistyped, digital mag is 2,4, and 8x. I stupidly wrote 1,2,3. Effective magnification starts at base of 2.5, then 5x, 10x, and a completely useless 20x I have never taken a pic at, it is beyond bad and shouldn't even be an option.
Base mag(2.5 base mag):
2x digital(5x magnification)
4x digital(10x magnification)
The further away something is when you are all the way up to 4x digital magnification, the worse it looks. These pictures, besides the water in the air also reflect my contrast and brightness settings. I can make pictures look better, but I like the white hot to make critters jump out so that is the way my Trijicon stays set.
This is with a high end 640 sensor, if you had a 320-384 sensor you could do 2x digital mag, but 4x would be mostly worthless in most cases. Base mag is where it is at for a thermal scope if you want to use it at any distance. 2x digital works pretty well, more than that get's into the pure suck range. Clip on thermals with less than a 640 sensor that are not military optics are 100 yard tops at 4x opitcal mag with your daytime scope. Berring optics makes a fairly reasonable 640 clip on, but if you ever look through a military one you would likely never put up with it. Stick with a thermal scope with a good base mag, or spend real money on a clip-on. I've briefly used a voodoo-s and a voodoo-m. I would never pay the money for the -s (>15k) but if I had the money I'd jump on the voodoo-m in a heartbeat for a clip-on. No problems getting to 15x mag on day scope with it and if that hawk was about 400 yards the voodoo-m would look much better at 15x than the 2x digital(5x) pic of that hawk at 125ish yards looks, costs around 22k or so.