Want to Buy Want to borrow incident light meter

BetterSense · Sep 3, 2010

I would like to borrow a high-quality, known-to-be accurate incident light meter. I will use it to calibrate the ancient General Electric exposure meter that I am restoring to usefulness by using electronic guts. I will only need it for a couple days, then I can send it back. I live in Dallas, and I will pay shipping.

sun of sand · Sep 4, 2010

just wondering why you cant "calibrate" it to any light meter
or even sunny 16

i have a weston master II selenium and its perfect still
i only use it for measuring light in the garden and nursery

BetterSense · Sep 4, 2010

I could calibrate it to any lightmeter, but I don't own a lightmeter. I'm replacing the selenium cell (which was good and dead) with a silicon photodiode and a microcontroller to drive the panel meter needle.

Rick A · Sep 4, 2010

Cover the photo-eye with something that wont let any light through and take a reading. If it reads anything but zero, reset to zero and try again. Then go outside and read for sunny 16 as normal and it should read on or very close to it.

BetterSense · Sep 4, 2010

Seriously, it didn't work. I tested it. Broken. I have already charted the current-versus-reading of the meter needle and written the software and everything. I just need to calibrate it.

Rick A · Sep 5, 2010

Are you looking for a digital or analogue meter to calibrate with.

eddie gunks · Sep 5, 2010

use an in camera meter....some one you know close by must have a digital camera with a meter.....

BetterSense · Sep 5, 2010

I have cameras with in-camera meters but many of them are no longer accurate and I feel that it's hard to translate the reflected meter reading given by a camera into an incident light meter reading that an incident meter would read.

Q.G. · Sep 5, 2010

If you have one that is still accurate, it's easy enough.
Point the thing at some greenery outside, measure the light illminating that greenery using the incident light meter, and the two should be the same.

sun of sand · Sep 5, 2010

can you take a reflective and turn it into an incident by diffusing the lens/sensor

ic-racer · Sep 6, 2010

I'll let you use my Norwood director. I'm holding it incident to the sun around noon in the Northern Hemisphere. It is giving me an aperture around f16 at 1/500 with ISO 400.

illumiquest · Sep 8, 2010

Lollers

Want to Buy Want to borrow incident light meter

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