Jump to content


Is this noise? Condensation?


Recommended Posts


It's been a few months since I last used my camera in earnest. It's in a roll off roof observatory. I have noticed some weirdness (two triangular patches on each side). Can anyone tell me what it is? It looks like condensation or some such to me, and gradually fades over about 5/10 mins. But I've never noticed it before. I don't think it causes any issues in imaging.

I have a dew heater on the objective lens, so could it be on the sensor? Is it normal and I'm panicking over nothing?




Later on - much reduced:


Link to comment
Share on other sites

I've had exactly this effect on both my 414ex-osc and (before I sold it) my 428ex-mono. I only used to see it when making flats and I would have to wait 5 or 10 minutes for these triangular areas to subside to the left and right and fade to nothing. I have no idea what it is and it may indeed be moisture but it never seemed to have any effect on the images.

Sorry I can't be of more help but I'm pretty sure it is nothing much to worry about.


  • Thanks 1
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

  • Recently Browsing   0 members

    No registered users viewing this page.

  • 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.