This has not been my experience. Selenium cells lose responsiveness in a non-linear manner.
I tossed out a number of Weston Master's 2 and 3 due that very reason, but for what ever reason my Master IV and old GE still spot on.
Matt, I'm pretty sure all these apps just rely on the phone's camera for metering. In other words, whatever the meter for the camera says is right is what it repackages in a different skin to give you. I don't think the app itself is doing any exposure calculations. Because of that, it probably does vary slightly from phone to phone. I haven't seen a phone with a bad camera in a long time, though.At least the iPhones have a common designer. Our phones use Android operating systems, and there is an even greater potential for variation.
Well I'm sure the apps rely on the camera, I doubt that the cameras are calibrated to the ISO standards for light measurement.
AFAIK they rely on the phone's photocell which controls the brightness of the screen.Matt, I'm pretty sure all these apps just rely on the phone's camera for metering....
I don't think this is correct. My app brings up an actual feed from the camera and adjusts the exposure for what is on the screen.AFAIK they rely on the phone's photocell which controls the brightness of the screen.
maybe there are diffenent apps on the market. I use an android app called lightmeter. it brings up the picture of an old style light meter with scales that react to the light. its not linked to the camera. it reacts to the photo cell of my phone. if I cover the cell it goes to zero.AFAIK they rely on the phone's photocell which controls the brightness of the screen.
Hi.
I am a high schooler and I shoot medium format in places like parties or events that are moving. I can’t casually carry around a big remote controller looking thing, I really gotta have something that can attach to a shoe.
3. In my experience selenium meters are much more reliable than CdS. I have several dozen meters. Nearly all of the selenium ones work, some may be a bit off. I think one CdS meter works and it's a Leica meter.
The meters whether it's built in camera or a hand held were calibrated at the factory. The cell phone app no calibration at all. It assumes all phones are the same.My light meters in and out of the cameras are calibrated by George at Quality Light Metric while my cell phone is not.
check out the Gosen Digisix meter.Hi.
Just purchased my first Mamiya RB67 online and I’m looking to get a light meter to go along with it. I’ve spent time in the past using various apps on my iPhone to meter the light, but I figured with a more professional camera, I should probably upgrade... I am a high schooler and I shoot medium format in places like parties or events that are moving. I can’t casually carry around a big remote controller looking thing, I really gotta have something that can attach to a shoe. I’ve looked at the Voigtlander meters, but the cheapest one I’ve seen was about $210... does anybody have any recommendations for attachable light meters that are some cheaper alternatives?
A few years ago I bought the Voigtländer exposure meter for shoe- mounting only to discover that I can handle my Gossen hand exposure meter (Sixtomat flash - bought mine used for about 100 Euros) much more precisely and flexibly.
Same here with free metering apps on my iphone - sunny16 is more accurate for me ...Many said the light meter apps for cell phones are good. I only tested some of the free versions and found them not accurate. I doubt that you can rely on the phone hardware to function identically from one phone to another.
While I would use a meter but I would rather use my knowledge of typical scene brightness rather than the phone app or a selenium meter or a meter that need mercury batteries.Same here with free metering apps on my iphone - sunny16 is more accurate for me ...
I test them by stepping outside on a sunny day.Do other people test their meters for accuracy?
It's a pretty easy process to determine the accuracy by instant testing on a digital camera, using 18% grey cards and getting instant feedback. The same process works for incident light meters or attachments.
If you're film only, it's also easy with a densitometer or a standard processing time, although it takes some time to create the test negatives. On older selenium meters I test at various light levels with both a grey card and a white piece of paper. I find that knowing these two values is more than accurate enough for most work. It's even easier with a CdS meter, especially with a spot meter or spot attachment on something like a Luna Pro. The only thing that gets tricky is monitoring for battery failure if you are using silver oxide cells.
Once you've got a standard, it's fairly easy to adjust the ASA/ISO on your other meters to compensate. There always a few what will have a non-linear response, or just be limited in their high or low response levels, but I've always found it a fairly easy process, as long as the meter goes to the top level of scale under maximum illumination.
How do others accomplish this process? Or do you do it at all?
Thanks in advance,
Andy
Indeed! Actually I have more than one meter, plus some cameras, digi and film, that have built-in meters and can compare. But a bright sunny day and a gray card can provide a check too. In the simplest case, reflective metering off a generic scene and comparing with Sunny-16 is a start.I test them by stepping outside on a sunny day.
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