In order to get the most out of Panorama Tools
it helps if you have accurate values for your lens parameters. There
are several ways of calculating these, this is mine. Yes it's
overkill. Yes it takes a reasonable amount of time. BUT it's proven to
be very accurate for me and the long term savings of that far outweigh the
time taken to calibrate a lens. If you're looking for a quick answer
to finding values for v, a, b and c for your lens then you'll need to find
another tutorial.