[argyllcms] Re: CCT of a Speedlight
- From: ternaryd <ternaryd@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Tue, 13 Jul 2021 19:40:38 +0200
On Tue, 13 Jul 2021 18:09:45 +0100
Production <production@xxxxxxxxxxxxxxxx> wrote:
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.
Power was 1/4. Maybe I should try again at full
power. But the text I cited said, that flash
doesn't alter color temperature noticeably with
power, only by age. And I think you just showed
that this might not (always) be true.
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 also took the shot, but the measurement was
with the i1pro3, and there I don't have ISO or
aperture. Just a distance and an ambient light
adapter.
I would have that that this is caused by the
reduction of duration and power to the tube
with this 35 year old hammerhead?
Somehow I have the feeling, that your 35 year
old Metz is behaving much better than my 6 year
old Nikon. And also, that this theory has just
died.
I think it makes no sense that flashes are
build with widely different colors.
Photographers would have reacted by always
buying the flash of the same brand. 5800°K is
just 200 more than the often mentioned 5600°K,
which I think is pretty much impressive after 35
years.
What's also confusing is the kelvin settings
resulting from selecting the flash white
balance preset in darktable. Maybe I should ask
on that list.
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.
Yes, and they do come with a different price
tag. But in the end, I don't think my flash is
broken. There must be some easy explanation for
it.
Thanks for your time testing.
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