dark problem

[liili]

I get the image of dark with the parameter as below
temperature 18
shutter 5 second

I find a line in the image.Is it a nomal?

[NickK]

Has that been auto stretched? I'm guessing this is a 838L - the Kodak sensors themselves are more noisy than Sony sensors.

All my CCD (and most others) will look like this (including 383L) look like this on high temperature (18degC) short exposures (5 seconds) and hot lines are common - my 383L has a couple, the 4000 has a few too!

The lines usually disappear with darks and/or sigma stacking.

[liili]

yes,if use the low temperature (-10dgC),the image is OK.Somebody told me,that is problem for the current.But it is difficult to explain why the phenomenon is right in the low temperature.If ATIK can tell me the reason,I will appreciate a lot.

[NickK]

The 383L likes a good power source - if the *voltage* drops as a battery empties charge then the noise can increase. I use a 13.5V mains PSU or a big Bosch S5 100Ah battery in the field so that the voltage remains high.