Gear Talk > Other
Sekonic C-700R Spectrometer - light examples
Andy:
Got a Sekonic C-700R Spectrometer a while ago as advanced light meter. It is not only able to measure light levels in ambient and flash light, but the C-700R can also measure SPD (spectral power distribution) over the visible light range (380-780nm) in 1 nm steps.
It is nice to see not only the average total luminosity, but where it is coming from - in case you are curious why for instance white balance didn't work out as expected, or why the noise level in one channel is particular high.
Here is an example of the spectral response of the Nikon D700 Color Filter Array (other models might deviate from this curve)
http://www.maxmax.com/nikon_d700_study.htm
Please find below some examples I took (a few spectral lines seems to be missing - need to check how to get rid of these missing lines, but they don't impact the overall picture of the distribution)
8am in the morning, blue sky. The sun hasn't raised yet over the mountains around us
1pm, at 2000m above sea level, blue sky, the spectrometer directed to the sun
evening, light overcast, directed away from the direction the sun went down. The sun wasn't visible anymore
rgds,
Andy
Andy:
In the street of the city - sodium high pressure light
There is just no blue or very low level of green the camera can properly recover from.
in the street of the city - fluorescent tube
Andy:
at home
halogen bulb
Nice to see the very famous noise in the blue channel is coming from. There was no energy in the blue channel to start with ...
Energy saving bulb - warm white
LED bulb
"Daylight" bulb of photographic light system (CRI > 95)
rgds,
Andy
Frank Fremerey:
Thank you, Andreas. I really feel at home in you posts.
I do not hold any stock in any opinion. I just want to know how things are and how things work.
The Sekonic seems to be a perfect tool to determine why our sensors react so nicely/badly to certain light sources.
I have to get one of these!
Erik Lund:
Very visual output ;)
Thanks !
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