Jump to content


5Diii light leak, or what


Recommended Posts

I decided that I should do a better process of some widefields I recently took, and apply a dark, so took the following dark image:


trouble is, I don't see the red streak on my lights:-


camera was in a dark room, lens cap on and light tight box for the dark, exposure details for both, 30 seconds at ISO 25600, lens on manual focus. and as far as I can recall, all other settings identical.


I've read that some 5Diii cameras suffer from leaks from the top LCD, but then it would be in the light as well.


Anybody with any ideas?




Link to comment
Share on other sites

14 minutes ago, wxsatuser said:

5DMK3 is known to have ampglow issues at high ISOs

Agreed, the corners look particularly bright in the dark, but why don't I see the red curved streak in the light?



Link to comment
Share on other sites

The reason I asked about a battery grip is that they place the batteries, normally two away from the camera internals  so any heat generated is not picked up by the sensor. An in camera battery can generate localized hot spots depending on the contact resistance, you have to remember that the 5D 111 is very sensitive.


Link to comment
Share on other sites

I'm still playing with this, and lo and behold, one of the 30 second darks I've taken has no red smear on it. Now I really am confused, there was no difference in the way I took the exposure from all the others I was taking.

Link to comment
Share on other sites

I think I've found it! The difference between the lights and the darks was the LENS CAP. Remove the lens cap, and replace with a black cloth, and the artefact goes away.


Live and learn



  • Like 2
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.