hello, here are some considerations:
FLIR E4 E5 E6 AND E8 they are 45° focus free which make the good for any general use but not always for specific PCB thermal investigation.
say we stay at 50cm from the PCB the field of view will be approx 41 x 31 cm for all models and the IFOV (pretty much the pixel size) will be:
E4 5.15mm
E5 3.43mm
E6 2.58mm
E8 1.29mm
if you move to the next category, say the E50 which is 25° manual focus the field of view will be approx 22 x 17 cm for all models and the IFOV 0.93mm
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the new FLIR C2 is really cool, I can tell by experience since we got many of them on the first batch delivered from FLIR, I also posted some images in a different thread.
pls feel free to ask any question
hope it helps, cheers