December 18, 2014, 10:28:09 PM

Author Topic: My new 600ex-rt seems to be 300K higher in color temperature (bluer)  (Read 1926 times)

PhotoCat

  • Rebel T5i
  • ****
  • Posts: 117
    • View Profile
Hi all!

I am continuing to test my new 600ex-rt.   :)
Flash Setting at full power 1/1, 105mm direct flash firing at a piece of white paper.
Using ML v2.3 RGB spot metering, I needed to WB my camera to 6300K in order to
get all 3 RGB values to match.

This tells me that my 600 is about 300K bluer than a "standard" flash, which is at 6000K.

My real life shooting has confirmed my test. I needed to dial K about 300K higher than my
usual setting to get the correct skin tone.  i.e. when I gel with CTS I used to need 3700K but now
I need to go to 4000K.

Out of curiosity, I pulled out a mint Nikon SB-80DX and tried that too. It is spot on at 6000K.
BTW, camera used was 5D2.

So I am just wondering if others r seeing this too?

Thanks!



canon rumors FORUM


Jim Saunders

  • 1D Mark IV
  • ******
  • Posts: 935
    • View Profile
Re: My new 600ex-rt seems to be 300K higher in color temperature (bluer)
« Reply #1 on: September 24, 2013, 05:59:18 PM »
Pardon my innocence, but is the 5% difference not academic?

Jim
See what I see: 6500K, 160 cd/m^2, ICC 2, gamma 2.2.

PhotoCat

  • Rebel T5i
  • ****
  • Posts: 117
    • View Profile
Re: My new 600ex-rt seems to be 300K higher in color temperature (bluer)
« Reply #2 on: September 24, 2013, 06:45:07 PM »
Pardon my innocence, but is the 5% difference not academic?

Jim

Hi Jim,
I agree 5% by number is probably quite insignificant but 300K in color temperature
is very noticeable IMHO. I noticed the blueness right away when I shot with it in the same venue.

I guess I can live with the 300K offset adjustment but I just wanted to make sure this 300K offset
is not a symptom of a more serious manufacturing defect of my new unit. That's why I am checking
if others r seeing the same phenomenon.

More tests were done with different power levels of the 600ex-rt and results as follows:

1/1 6300K
1/2 6500K
1/4 6600K
1/8 6600K


Jim Saunders

  • 1D Mark IV
  • ******
  • Posts: 935
    • View Profile
Re: My new 600ex-rt seems to be 300K higher in color temperature (bluer)
« Reply #3 on: September 24, 2013, 07:51:35 PM »
Weird.  I'll try mine, hang on a few minutes.

Jim
See what I see: 6500K, 160 cd/m^2, ICC 2, gamma 2.2.

tpatana

  • Canon 70D
  • ****
  • Posts: 284
    • View Profile
Re: My new 600ex-rt seems to be 300K higher in color temperature (bluer)
« Reply #4 on: September 24, 2013, 08:01:38 PM »
300 is easily noticeable when you compare side-by-side, but not so much if you just pick random photo and it's off that much. Also depends plenty on the photo.

Drizzt321

  • 1D X
  • *******
  • Posts: 1675
    • View Profile
    • Aaron Baff Photography
Re: My new 600ex-rt seems to be 300K higher in color temperature (bluer)
« Reply #5 on: September 24, 2013, 08:04:04 PM »
Probably has to do with the differences in power from partial to full. Contact Canon and see if this is a normal deviation from spec, or if there's maybe a faulty capacitor or something that's causing it to not give quite enough power at full power to the flash tube.
5D mark 2, 5D mark 3, EF 17-40mm f/4L,  EF 24-105mm f/4L IS USM, EF 135mm f/2L, EF 85mm f/1.8
Film Cameras: Mamiya RB67, RB-50, RB-180-C, RB-90-C, RB-50, Perkeo I folder, Mamiya Six Folder (Pre-WWII model)
http://www.aaronbaff.com

Jim Saunders

  • 1D Mark IV
  • ******
  • Posts: 935
    • View Profile
Re: My new 600ex-rt seems to be 300K higher in color temperature (bluer)
« Reply #6 on: September 24, 2013, 08:15:32 PM »
I shot my WhiBal card and got 5850, 5900 and 6100; That was each light on well-charged AAs and the same setup.  6300 seems a little high but as long as it is consistent then I don't think it is worth much trouble.

Jim
See what I see: 6500K, 160 cd/m^2, ICC 2, gamma 2.2.

canon rumors FORUM

Re: My new 600ex-rt seems to be 300K higher in color temperature (bluer)
« Reply #6 on: September 24, 2013, 08:15:32 PM »

PhotoCat

  • Rebel T5i
  • ****
  • Posts: 117
    • View Profile
Re: My new 600ex-rt seems to be 300K higher in color temperature (bluer)
« Reply #7 on: September 24, 2013, 09:51:49 PM »
I shot my WhiBal card and got 5850, 5900 and 6100; That was each light on well-charged AAs and the same setup.  6300 seems a little high but as long as it is consistent then I don't think it is worth much trouble.

Jim

Thanks Jim for helping out. I am guessing your 3 numbers are for power 1/1, 1/2 and 1/4 respectively.
The change in color temp is 250K from 1/1 to 1/4.  Mine is 300K.
Looks a little better than mine I guess. This tells me 600ex-rt's color temp does vary considerably with power level.
Also the absolute color temperature value does have manufacturing variations
as much as a few hundred k's.

Just tried my old 580exii again just to compare:

1/1 6200
1/2 6300
1/4 6300
1/8 6300

Color temp on 580exii seems a lot tighter with respect to power.

Thanks to all who had replied!

Jim Saunders

  • 1D Mark IV
  • ******
  • Posts: 935
    • View Profile
Re: My new 600ex-rt seems to be 300K higher in color temperature (bluer)
« Reply #8 on: September 24, 2013, 10:04:01 PM »
Those numbers are for each of my three lights fired in ETTL at a piece of paper on the wall, with white balance drawn from the white panel on my WhiBal card using the tool in LR5; I should have specified.  If you want I can try each of them at different power settings.

Jim
See what I see: 6500K, 160 cd/m^2, ICC 2, gamma 2.2.

PhotoCat

  • Rebel T5i
  • ****
  • Posts: 117
    • View Profile
Re: My new 600ex-rt seems to be 300K higher in color temperature (bluer)
« Reply #9 on: September 24, 2013, 10:39:16 PM »
Those numbers are for each of my three lights fired in ETTL at a piece of paper on the wall, with white balance drawn from the white panel on my WhiBal card using the tool in LR5; I should have specified.  If you want I can try each of them at different power settings.

Jim

oic... thanks Jim for all the help! I think I have a bigger problem than that now...
My 600 is vy voltage sensitive with regard to recycling time.
Freshly charged Eneloop AA batteries give a recycling time of 2.4S when an eneloop
charged just 2 days ago gives > 3.2S!  I think this is unacceptable and I am going to exchange my 600ex-rt.
Probably the color temp thing is related.

Thanks all for helping out! John

canon rumors FORUM

Re: My new 600ex-rt seems to be 300K higher in color temperature (bluer)
« Reply #9 on: September 24, 2013, 10:39:16 PM »