olichris
Affiliation
American Association of Variable Star Observers (AAVSO)
Thu, 05/24/2018 - 23:09
Good Morning all, I am sending you this message to ask you if you have the transmission curves of the color channels of modern Nikon camera models, such as the D3200, or if you know any website where to find them, as I searched for all sides and there seems to be no information available.
Thank you in advance for the information you can provide me.
Oliver Christopher López
(Andrés Bello Astronomical Complex)
If you're searching online, try the term "spectral response" rather than "transmission" to get better results, for example https://maxmax.com/spectral_response.htm
Transmission is only one (probably minor) part of the camera's response.
This is a company apparently making filters removal to apply cameras to IR imaging. The curves they show are not what we get from standard Canon DSLR, like the 40D as an example (sorry, I don't have Nikon). The linearity curve they show is very surprising too, the ADU (or e- count) in function of the sensor illumination (or photon count) is normally very linear. Their curve looks like a gamma curve.
Apparently what they got is not a RAW linear output, we normally use, but the signal after the imaging standard sRGB color space transformation that is improper to photometry (color change, very non linear, and 1/2.2 gamma). I have often seen such mistake in spectral response discussions for DSLR photometry.
Clear Skies,
Roger
Hi, Roger,
I am wondering if you have come across this site http://www.gujinwei.org/ and particularly his links to "
What is the Space of Camera Spectral Sensitivities?[project] [database](with code)"?
Clear skies,
Stephen
Thank you very much to all. the first link already knew, are the transmission curves of the RGB matrix without the IR cut filter. the second place if I did not know it, although the nikok 5100 is not the nikon d3200.