Thanks BIll and IR for your helpful replies.
Slight confusion, IR ... the 21B is the higher spec unit. Both are 160 x 120 thermographically, though the 21B has 4 times the number of display pixels.
To try to better illustrate my problem, the attached pics show an unpowered mains extension socket 'rail' at 2m, captured in thermal, fusion and optical views with rainbow and white-hot palettes.
Key settings:
Emissivity - 0.95
Distance - 2.0m
Reflection temp - 25C
Humidity - 50%
Parallax correction - 1.0m (notes nothing I've tried has successfuly changed this setting - it just reverts to 1.0m)
Picture Resolution - 8MP
Range - Auto
Prior to capturing these images, the Measurement tool Initialisation and SD Card Initialisation were each re-set and the device then also restored to Default Settings. Manual focussing was carried out before each shot.
The Fusion shots clearly show a mis-match between the thermal and optical views. Is this normal, or might it too be an indication of internal misalignment caused by being dropped?
eBay apart, current offerings online for this model, new, include around £1.9K (pass-thermal.co.uk) and £5.9K! (isswww.co.uk), so considering this indicates that it's a serious instrument and not merely similar in performance to cheap Chinese alternatives - along with with Fortus chap being clear that the thermal image should be very crisp and even better than than 31B - I don't think I'll be convinced until I can compare it with another similar example. Might there be someone in the Bristol UK area who has one that I could drop-by to check with, please?
Being one who's not afraid of tinkering, I've considered dismantling it to see if there's anything obviously out of place that I might try to correct, but the rear casing doesn't readily come off and I don't want to risk breaking the plastic. Does anyone have any tips on how to do this, or know where I can view or get a copy of a service manual, by any chance, please?
Thanks again for reading - any further observations gratelfully received. If I'm to return it, I only have a few days left
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Nic