[argyllcms] Re: CCT of a Speedlight
- From: Production <production@xxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Tue, 13 Jul 2021 18:09:45 +0100
On 13 Jul 2021, at 15:40, ternaryd <ternaryd@xxxxxxxxx> wrote:
I don't have the source, as this was one citing
several others. But it seems that compact
flashes suffer by aging (the light becoming
brownish) because the frensel lens in front of
the xenon tube is plastic. Mine might be some 6
years old, so I didn't consider it really
"aged", but for not having a better answer (nor
what exactly does cause this aging), I'll have
to accept that.
I just tested my 1986 Metz 45 CT-4 with an i1Pro2.
On full power I get a CCT of 5800 and a relatively smooth plot which is steep
from 380 to 470 and then a shallow slope down to 730 — like you'd expect from a
portable flash.
If I limit the power by setting it to auto/f2.8/high iso then I get CCTs around
6800 and a wobbly but similarly shaped plot except there is a very distinctive
and steep downward spike between 490-530.
I would have that that this is caused by the reduction of duration and power to
the tube with this 35 year old hammerhead?
Would expect better from the Nikon Speedlights as they are capable of firing
multiple times in what appears to us to be a single flash.
--
Martin
Idea Digital Imaging Ltd
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