What is the name of the meter app you have on your phone?
I thought it would be interesting for me to read the instructions, and any write ups about the app.
I wonder if I installed the same app on my phone in 3 places, (same phone just 3 copies of the same app) if all 3 would read the same? I don't know how I could measure simultaneously. Temporal distortion?
I use an incident meter for slide film, still I bracket.
For black and white I use sunny 16, meter or just guess.
Way over thinking for my meager brain.
No need to overthink, apart from recognizing and neutralize any variables in a test circumstance...keeps things simple for the simple mind, or simply meets 'scientific' test criteria.
- Three copies of same app on same phone (if it were even possible) would result in same reading...the hardware (sensor) in the phone has a fixed output in response to a fixed amount of light.
- My installing same app on two (different models from same manufacturer) tested the (probable) use of different sensors in different generations of phone from same manufacturer...different response from (likely) different sensors, seems to show that all sensors are not identical in their response to a fixed amount of light.
- Inability to measure 'simultaneously' is resolved simply by using a not-variably illuminated scene...an indoor artificially illuminated blank featurelesss wall accomplishes that.
Bracketing even using incident meter simply illustrates why pros shooting for clients will bracket even artifically illuminated shots...what one finds to be 'most pleasing' rendition can subjectively depart from 'ideal exposure'. And 'ideal' for offset print often is different from 'ideal' for projection...different 'ideal' for different uses.
I think even 2 phones of same make and model woudn't have the same reading. I believe when they build meter or even cameras they have to calibrate each one and can not count on that the hardware are the same.
If it were an analog device, I would tend to agree. But the sensor is a digital device, the phone manufacturer does not need to calibrate each and every phone individually in order to use the built-in camera app that is included with each phone...right?
Once the sensor is chosen for a model, the O/S for the phone can be 'calibrated' once with a value specific to that MODEL, but not for each unit of that phone.
Hi dcy… whenever you can would you please re-do your post #1 measures and re-verify that your phone meter reasonably measures the scene and determine how close the LunaPro F is when used in the correct mode. Sooner than later would be nice as the arguments can easily be resolved with just a couple of minutes of effort.
What is the name of the meter app you have on your phone?
I thought it would be interesting for me to read the instructions, and any write ups about the app.
No need to overthink, apart from recognizing and neutralize any variables in a test circumstance...keeps things simple for the simple mind, or simply meets 'scientific' test criteria.
- Three copies of same app on same phone (if it were even possible) would result in same reading...the hardware (sensor) in the phone has a fixed output in response to a fixed amount of light.
- My installing same app on two (different models from same manufacturer) tested the (probable) use of different sensors in different generations of phone from same manufacturer...different response from (likely) different sensors, seems to show that all sensors are not identical in their response to a fixed amount of light.
- Inability to measure 'simultaneously' is resolved simply by using a not-variably illuminated scene...an indoor artificially illuminated blank featurelesss wall accomplishes that.
Bracketing even using incident meter simply illustrates why pros shooting for clients will bracket even artifically illuminated shots...what one finds to be 'most pleasing' rendition can subjectively depart from 'ideal exposure'. And 'ideal' for offset print often is different from 'ideal' for projection...different 'ideal' for different uses.
Hmmm....
I have a mirrorless (digital) camera. That has light meter that should be accurate. It's at home right now, but I could grab it and bring it tomorrow to work and see what it says.
I don't know how well one can compare ISO settings for digital vs film. My understanding is that digital ISO is more or less a made up number from the manufacturer. But presumably it's close enough to film ISO to prove that the Luna Pro F knows what the sky looks like better than my phone's light meter app.
If you could, under sunny 16 condition use the Luna Pro F in incident mode and see what you get.
Hmmm....
I have a mirrorless (digital) camera. That has light meter that should be accurate. It's at home right now, but I could grab it and bring it tomorrow to work and see what it says.
I don't know how well one can compare ISO settings for digital vs film. My understanding is that digital ISO is more or less a made up number from the manufacturer. But presumably it's close enough to film ISO to prove that the Luna Pro F knows what the sky looks like better than my phone's light meter app.
The app is measuring reflected light, which is sampled from the circle.
The Luna Pro is measuring Incident light, which is measured from the dome integrator.
The white board is also acting much like the dome integrator, so the readings are the same.
Apples and oranges. Nothing needs fixing.
A whiteboard would only be an appropriate subject if you are using both light measuring tools as reflective light "meters".
A better target closer would be something that reflects 18% of the light, but the whiteboard will di in a pinch.
That's a relief, but out of an abundance of caution, I'd like to ask @BrianShaw if your comments change his opinion, or if he still thinks I should return the meter and request a refund. I feel fairly confident that if I report that the meter does not work as advertised and request a refund, I will get the refund.
@Kino Do you think my other attempts at metering a uniform scene (e.g. a wall, the sky) are also equivalent to adding a dome integrator?
I don't have a gray card. As an imperfect substitute, I held my hand (Caucasian skin tone) 2 inches from the light meters (hoping to cover the entire field of view), trying to keep the same angle relative to the ceiling light in my office. In that setting, the Luna Pro F meter in reflected-light mode and the phone light meter gave identical answers, within the margin of error: The phone app flickered between 1s and 2s exposure, while the Luna Pro F gave me a reading of 1.5s ---- all at F/16, ISO 200.
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