Light Meter Apps.
Feb 22, 2023 16:09:45 #
I don't have 2 smartphones of the same make and model so I can't test it. I wonder if you use the same app on 2 smartphones of the same make and model would they give the same reading?
Feb 22, 2023 19:49:22 #
a6k
Loc: Detroit & Sanibel
Is this idle curiosity or do you have two models in mind? I can compare an iPhone 6s to a 14pro, for example.
Feb 22, 2023 19:51:32 #
a6k wrote:
Is this idle curiosity or do you have two models in mind? I can compare an iPhone 6s to a 14pro, for example.
No I want to compare the 2 same phones. For example 2 Iphone 14 Pro.
Feb 22, 2023 21:16:05 #
BebuLamar wrote:
No I want to compare the 2 same phones. For example 2 Iphone 14 Pro.
Why?
Feb 23, 2023 05:21:02 #
Feb 23, 2023 08:25:19 #
BebuLamar wrote:
Because I suspect that they will give different readings.
Just like any light meter would?
Feb 23, 2023 09:18:09 #
BebuLamar wrote:
Because I suspect that they will give different readings.
Same app, same phone, same conditions - they certainly should give the same reading.
Feb 23, 2023 09:41:28 #
JohnSwanda wrote:
Same app, same phone, same conditions - they certainly should give the same reading.
Feb 23, 2023 09:46:00 #
Feb 23, 2023 10:15:46 #
JohnSwanda wrote:
Same app, same phone, same conditions - they certainly should give the same reading.
Same app, Same model of phone but not the same phone, same condition. I would like someone that have 2 phones of the same model to test it out. I believe they don't read the same.
Feb 23, 2023 11:22:56 #
fetzler
Loc: North West PA
You could easily perform a test.
1.Take meter readings from a gray card or blank wall of some fairly neutral color. Even white will be OK.
2. Use your cameras to take a reading.
3. Use a couple of cell phone applications. Borrow a friends phone or your spouse's phone. Repeat the measurements. I suspect all will be close enough for photographic purposes. If you have a android tablet this could be used in place of a phone. If you have an old phone it could be used too. No need for cell service just wifi access.
Couple of things to consider.
Various light meters have different angles of view. Be sure you are measuring the same thing. A blank wall measured at a reasonably close distance should minimize this issue.
Still Cameras use f stop stops and not t stops. Cameras lenses absorb a certain amount of light thus not all the light is transmitted through the lens. This effect might be noticeable but is likely not photographically significant for still photography. You can try several of your lenses on the camera bodies.
We await the results of your experiment.
1.Take meter readings from a gray card or blank wall of some fairly neutral color. Even white will be OK.
2. Use your cameras to take a reading.
3. Use a couple of cell phone applications. Borrow a friends phone or your spouse's phone. Repeat the measurements. I suspect all will be close enough for photographic purposes. If you have a android tablet this could be used in place of a phone. If you have an old phone it could be used too. No need for cell service just wifi access.
Couple of things to consider.
Various light meters have different angles of view. Be sure you are measuring the same thing. A blank wall measured at a reasonably close distance should minimize this issue.
Still Cameras use f stop stops and not t stops. Cameras lenses absorb a certain amount of light thus not all the light is transmitted through the lens. This effect might be noticeable but is likely not photographically significant for still photography. You can try several of your lenses on the camera bodies.
We await the results of your experiment.
Feb 23, 2023 11:40:34 #
I have Iphone 12 and my wife has Samsung S22 so they are not the same model. I have to find someone with the same phone model.
Feb 23, 2023 12:31:15 #
JohnSwanda wrote:
Same app, same phone, same conditions - they certainly should give the same reading.
I’ve used many physical meters over the years. ALL of them had to be calibrated with the rest of my equipment and habits. Most were within a stop of each other, but at least one Gossen Luna Pro F was off by 1.67 stops!
Ergo, I’m not worried that MyLightMeter Pro app on my iPhone is off about half a stop. It has an EV compensation feature.
Feb 23, 2023 20:53:22 #
a6k
Loc: Detroit & Sanibel
BebuLamar wrote:
I don't have 2 smartphones of the same make and model so I can't test it. I wonder if you use the same app on 2 smartphones of the same make and model would they give the same reading?
This is not what you asked for but I hope that you will find it tangentially helpful. This picture is of my two iPhones looking at a white target while held in my hand. You can see that the readings are quite close, probably not meaningfully different for an actual exposure.
You can ignore that the images on the phones' screens are not alike. It's the numbers that matter. That app measures inside the orange rectangle. The phone on the left is a "6S" and the one on the right is a 14 Pro. They are years apart.
I apologize for the poor quality of the snapshot. I had to hold two phones in my left hand and take the picture with my iPad one-handed. You can't see it but the settings for time, aperture and ISO were the same on both. The color temp was also quite close.
Feb 23, 2023 20:56:47 #
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