Using DSLR as 'tint' meter...
Re: Using DSLR as 'tint' meter...
Privacy tints should be dark enough that simply comparing exposure of the same scene through the window & with the window open will give a fair idea. For best results you want a scene of even brightness & the sky will often do especially if you meter from the same point
You should be able to see how many stops darker it is through the window. Av (on fixed ISO) is the simplest mode to use as it only changes one variable and you don't even have to remember the aperture scale & he times are much easier for fractional stops.
For the front windows the tint will not be dark enough for this approach - IIRC it shouldn't be less than 18% to be legal in the UK. My brother found to his cost after buying a second hand car with tinted windows that police cars here carry tint meters.
I'm sure you can work this last bit out, but I'll include it anyway. Each stop of extended exposure is a drop in light of 50% so %Transmission is 100- (100/stops)
Pentax K100D
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Jun 6, 2020
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