Yann Cainjo

Hi Carl

Regarding spectrophotometers & flicker meters I personnaly prefer Gossen Mavospec Base ergonomy, more on-set use oriented and quicker to use.

UPRTEK are also accurate spectrophotometers (same accuracy than Gossen spectrophotometer), but more laboratory and industrial production oriented.

I mainly check flicker main frequency, for safe shutter speed and frame rate calculations, flicker percent et flicker waveform to estimate if flicker amount is high or low.

Hope it helps...

Hi Carl

One solution is to use a spectrophotometer with flicker measurement.

Gossen Mavospec Base can do it. UPRTEK has one too.

https://gossen-photo.de/en/mavospec-base/

Having flicker main frequency evaluation (neglecting harmonics influence), you can choose most secure framerates and shutter speeds.

Best regards

***

Yann Cainjo

Photographer & Gaffer

Paris, France

Hi Craig

We made last year an independent study on photometric and colorimetric performance of LED lights published by CST in France (English & Spanish translations included) :

http://www.cst.fr/wp-content/uploads/2016/04/Etude-CST-LED-2016-rapport-final-Internet-v2.pdf

For this study we used 4 different spectrophotometers :

Sekonic C700

UPRTEK MK350N+

Minolta CL-500A (laboratory spectrophotometer)

Specbos 1211 (laboratory spectrophotometer)

We measured the Magenta/Green bias with the UPRTEK, because it was the more accurate.

There are 2 UPRTEK spectrophotometers usable for film industry with the Magenta/green calculation :

UPRTEK MK350N+

UPRTEK CV-600

We didn't use the SEKONIC C-700 to evaluate the magenta/green bias because there was a problem with the former C-700 firmwares.

Maybe the last firmware update solve it ?

Regards

Yann Cainjo
DP, Photographer | Paris

Philippe

Maybe at Atelier Procirep (13th district, Paris) :

Atelier PROCIREP

01 45 80 10 04

53 rue du dessous des berges

75013 Paris

https://www.atelier-procirep.fr/reparation-materiel-photo/cellules-a-main/

Yann

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Yann Cainjo

Photographer / DP

Paris, France

An independent study on photometric and colorimetric performance of LED lights published by CST in France (English & Spanish translations included) with reference data from kino, tungsten and hmi jokerbug :

http://www.cst.fr/wp-content/uploads/2016/04/Etude-CST-LED-2016-rapport-final-Internet-v2.pdf

It is an update of a former study (2014, only in French but same layout) :

http://www.cst.fr/wp-content/uploads/2014/06/etude_projecteur_LED_maj-20-01-15.pdf

Yann Cainjo

DP, Photographer | Paris

+1 @Jean for Sekonic C-700

and UPRTEK CV-600

Don't buy colormeter (C-500). It work only for incandescent lighting... Better to use a spectrophotometer (Sekonic C-700 & UPRTEK CV-600) for LED, HMI/MSR and fluo