The gradual increase in the strength of tint, on each separate side glass, results in a better graduated transition when viewing the car from the side.
I had my previous ZS EV Gen1 fairly strongly tinted from the “B” pillar back.
As we know the Gen1 offers no factory tint and therefore no UV / heat protection in the cabin.
Dark tinting from the “B” pillar back is a big improvement, however when viewing the car from the side, it almost gives the impression it is two cars stick together
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This because there is no gradual transition stage.
it’s clear glass in the front doors, then “Bam” heavy tint right alongside it in the rear door glass !.
It’s a bit of a brutal cut off in my mind.
To this end, when we upgraded to the Gen 2 model, it did come with a very slight factory tint.
It was okay ( ish ) for the front side glass, but did not offer enough protection to the rear side windows and rear windscreen IMO.
I used the same tint guy for both cars and said I wanted the tint to be more gradual this time around.
He did the rear screen with a heavy tint, then stepped it down in the rear side windows.
The front side windows were left in the factory tint.
I was really pleased with the results, what ever angle you view the car, it just looks right somehow
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I think it gives the best compromise of protection without any legal complications.
The tint guy I used has been tinting glass for over 20 years and refuses to tint any glass forward of the “B” post.
It had been a policy he will not deviate from.