Re: Spectral sensivities
Re: Spectral sensivities
- Subject: Re: Spectral sensivities
- From: edmund ronald <email@hidden>
- Date: Thu, 17 Mar 2016 02:12:15 +0100
of course, one can always measure the lens. :)
there is only one iliah. maybe he could be cloned, and rented out to all
industry actors ...
Emund
On Thursday, March 17, 2016, Roger Breton <email@hidden> wrote:
> I have an OceanOptics USB4000 with a radiometrically calibrated tungsten
> light source too. Could that help?
>
> / Roger
>
> -----Original Message-----
> From: colorsync-users-bounces+graxx=email@hidden
> <javascript:;> [mailto:colorsync-users-bounces+graxx <javascript:;>=
> email@hidden <javascript:;>] On Behalf Of Ben Goren
> Sent: 16 mars 2016 12:50
> To: ColorSync <email@hidden <javascript:;>>
> Subject: Re: Spectral sensivities
>
> On Mar 16, 2016, at 9:36 AM, Wüller Dietmar <email@hidden
> <javascript:;>> wrote:
>
> > The easiest and cheapest way to get spectral sensitivities for a single
> device is to have it measured as a service.
>
> Easiest, maybe, but certainly not cheapest. And perhaps not best, either.
>
> The bill of materials for a suitable spectroscope is under $20. You'll
> need to know the transmission efficiency of the diffraction grating, and
> the least-worst way to get that is with a monochromator...but you can get a
> monochromator for cheap off FleaBay, and a spectroscope design can be
> adapted to a monochromator design if you want to continue the dirt-cheap
> route.
>
> And virtually nobody I'm aware of (with one notable exception who's
> reading these words (Hi Iliah!)) takes the lens into consideration when
> determining a camera's spectral sensitivities. Some lenses have rather
> complex spectral absorption characteristics. If you must use a lens, use
> Canon's "Plastic Fantastic" 50mm f/1.8; its transmission is as spectrally
> flat as you'll find in any lens and significantly flatter than many,
> including lots of top-of-the-line L glass. But if your commercial service
> (or whatever) assumes that the optics are spectrally flat, you've got the
> lens permanently "baked into" all your data.
>
> Cheers,
>
> b&
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