Wednesday, December 21, 2011

Where is this dust located on my sensor?

Question

I have a really nasty looking piece of dust on my 550D's sensor, situated in the top right-hand corner of each image I take with anything higher than f/11. I am going to get a decent sensor cleaning kit, but I'd like to know which corner of the sensor should I focus on to get rid of this annoying particle?

In other words, does a lens flip the incoming light from left to right and turn it upside down? I think that's correct, so that means the answer in this diagram will be A, correct?

enter image description here

And before anyone asks - yes, I will clean the entire sensor while I'm in there, but this will help me focus on this particular (pun intended) problem. Thanks in advance!

Answer

(A) is indeed the correct answer (he said, remembering well the reflex finders sans prism that he's used over the years, which didn't flip the image right-to-left and made panning a bitch).

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