If I am not mistaken Merlin had 3 cameras. NIR, MWIR, LWIR They all had the same body. I had one once (LWIR uncooled) but I no longer own it. Apparently the MWIR used a linear cooler. So buying one second hand isn't a bad idea (My amber radiance is much older and still works!). They tend to have great cool down times (5-6min). The interface is a bit dated and the connectivity isn't the friendliest. I believe it worked with FLIR researcher (not sure tho) I attached the datasheet for more info on the 3 cameras in their line.