Luminance, etc.

Yes. It is possible. Very coarse.
Quote
"A very rough Lux photo album design measurement is possible with the SLR (NEDCC): camera setting 800 ASA and 1/60 sec a 35 mm lens is set 30-40 cm on a white board." The aperture is adjusted until the camera shows a correct exposure. "Then 50 lux, Aperture is f/4 5.6 = 100 lux, Aperture 8 = 200 lux, etc."
Quote from


Especially this quote might be interesting:
"The luminance depends on not only the illuminance and the single-beam angle of the light off but also by the reflectance of the surface (if the surface is black or white). A dark painting required therefore stronger lighting, so that we can recognize it well."

On this site, there are also all kinds of formulas that you can maybe help.

What does Bella is face of skills also, current cameras, makes sense.

Hi, Bella.
Thank you for your first very helpful answer. I'm not the photo but to a cheap and for each viable rough Lux measurement. Hence no 18% gray box, because the back no one has at home ;-)

Thanks for the reply and the link. There is only a bottom line, not as Lux now however the calculation - camera exposure generally behaves. I rummage me but time through the citations, sounds at first glance quite bauchbar.

Would be happy about more ideas. Also links or references to the literature.

for a rough "Lux measurement >" so lighting strength measurement does hold the camera - as has been explained already.
I take to my light meter, and the conversion calculator.
A "Schätzeisen" for various measurements (voltage think 2A, noise and light intensity up to 400V, power up I...) there were less than €50 once at Lidl, so one I have me put to, good for "Treasure measurements" enough.

TO the degrees of the reflection of "white" paper: Ca 85 to 92% the deviation is therefore quite large. It more accurately is measured on a gray card.
Return expect directly from the exposure metering (spot goes there) on the grey card on there incident illuminance. Note that it is "normal illuminance on the grey card, so you must place the card horizontally for horizontal illuminance or vertically for vertical illuminance. Important: The camera should nevertheless, ca 90 ° to the measuring plane '' look '' otherwise it comes through the reflection behavior of various grey cards to materially.
Only the direct metering allows an exact lighting level measurement, as only the direct measurement of luminance is the actual "brightness" that conversion of illuminance without exact reflection Indicatrix (3-D reflection curve for an angle of incidence, for multiple incidence angle are appropriately taken into account several) any calculation is only an approximation