Ex1 high white balance

[Mark Slocombe]

Has anyone experienced their ex1 giving very high white balance readings? One of ours has begun to, compared with another ex1 in same light conditions, am wondering what causes / solutions may apply. We have done a factory reset and cam is going to the engineer this week, but any thoughts appreciated.

[Luc De Wandel]

Are the lens surfaces perfectly clean? A slight yellowish fogging of the lens could cause this. It's just an idea.

[Vincent Oliver]

I presume you have the same camera profile settings and using the same UV or skylight filters (if any) ?

Do you have any samples that you can post, screen-grab a single frame from each camera, it would be interesting to see how much variation you have.

I use the EX3 and have experienced a slight shift in colour using the same camera but taking a new WB after 30 minutes. You didn't mention what lighting you are using, how you are taking your reading; on tripod, handheld, white card in same position or just hand held. From my experience, I also found the lighting can change colour balance after warming up, even with LED and more so with tungsten lamps.

[Mark Slocombe]

Thanks chaps - nothing on lens, all settings the same: difference between the two cams is usually about 300-400k. Taking to engineer today - we'll see.

[Leonard Levy]

Are you actually seeing a difference in the color of the pictures or just the K reading .
If its the latter pay no attention as the Kelvin readings are only meant to be approximate. If the cameras are balancing differently then its time to send it to the shop - though figure out which one is right first.
It would be valuable to check if the presets look different also.

I had an EX-1 that white balanced fine but the preset was too magenta and that was fixed by Sony service in LA.

[Mark Slocombe]

Resolved: engineers found that they had not calibrated a replacement lens correctly on the ex1 I bought recently. Now both cameras give WB readings within 100k of each other.