Film-Tech Forum ARCHIVE: Harkness Digital Screen Verifier

This is topic Harkness Digital Screen Verifier in forum Digital Cinema Forum at Film-Tech Forum ARCHIVE.

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Posted by Pietro Clarici (Member # 4937) on 08-29-2016, 10:07 AM:

Has anyone tried the Harkness app for iPhone? I'm not expecting it to be as accurate as a professional meter, but I was wondering if it could be useful to do approximate spot checks and track lamp brightness decay.

Posted by Mark Gulbrandsen (Member # 72) on 08-29-2016, 01:51 PM:

You should try to check it against a known calibrated meter to see exactly how it behaves at say 10 to 16 fl levels. Once the tracking (Or the tracking offset) is known, then yes, you could use it.

Mark

Posted by Pietro Clarici (Member # 4937) on 08-30-2016, 01:27 PM:

I'll definitely measure the reference values that every time my technician comes around with his equipment, just wanted to know if I can expect it to be somewhat consistent or if the measurements are all over the place.

Posted by Harold Hallikainen (Member # 5405) on 08-30-2016, 03:04 PM:

I think it is unlikely that the projector and meter would drift the same amount and direction. If readings are stable, I suspect the projector is stable.

Harold