black shading question

[Tom Chase]

Okay, this is not meant to be a smartass question, but the weather here in TX has been full of huge tempature swings. I have an exterior scene to shoot this afternoon the temp is suppose to be in the mid 60's. Shot some pick up shots this morning temp was 28 degress, did a black shading calibration. It has been common over the past month to see 30-50 degree temp shifts in a day. My question is simple does this mean I should be doing multiple black shading calibrations in a day? I know RED say when you have a major temp shift to do it. Seems kind of crazy.

Thanks

Tom

 

[Ulf Krentz]

Tom,

It´s not the outside temperature that is critical for black shading. As long as you can keep your sensor temp in the same range you´ll be OK. Of course this also applies for the very first shots, let your camera warm up to your working (and blackshading) temperature. HTH.

Cheers, Ulf

 

[Tom Chase]

Ulf thanks for the heads up. Will keep that in mind from now on.

Tom

 

[Mike P.]

Operating temperature deltas of 25 degrees celsius and that's probably a conservative estimation. Use "adaptive fan" and it'll keep the camera within the same operating temperature range (35-60c) almost regardless of the external temp (within reason). Even in your example, 28 to 65 = 37f = ~20c different in EXTERNAL temp… the operating temp is probably within 10degrees (unless you're using adaptive, then it'd be within 5 probably.)

In my experience, black shading doesn't make for a substantially better image unless it's really extreme swings. I think it's more for covering up dead pixels, to be honest.