I mages took leave behind weird mark?

[allanbui]

I have noticed that the pictures I take with longer exposure and white background leave behind an identical mark on the same position of every picture.
At first I thought it was dirt on my lens so I cleaned the lens and it's still there.
I've also switch between 2 different lenses and it still exist.
Have anyone ever face this problem before?

 

[480sparky]

Clean your sensor.

 

[cgipson1]

I have noticed that the pictures I take with longer exposure and white background leave behind an identical mark on the same position of every picture.
At first I thought it was dirt on my lens so I cleaned the lens and it's still there.
I've also switch between 2 different lenses and it still exist.
Have anyone ever face this problem before?

Post a shot of it.. probably a dirty sensor as mentioned!

http://www.thephotoforum.com/forum/...forum-functions-pictoral-guide-using-tpf.html

 

[allanbui]

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[EIngerson]

Yup, clean your sensor. You could probably taken the lens off and hit that with a squeeze blower to get it out.

 

[unpopular]

Stubborn dust for sure.