Weird dust on sensor

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got dust problem on sensor.

trying clean simple blower (don't have brush of sort), couldn't seem clean off. after cleaning, attached macro lens , set f/20 , took photo see if dust still there.

anyway, took photo , saw lot of spots @ top right corner of frame. took off lens, used mirror lock-up, , tried again.

took photo @ f/20, , still got dust @ top right corner. looking @ sensor, doesn't seem there's clean, although dust can smaller can see. anyway, tried flipping camera upside-down, , took photo of same object. instead of dust appearing @ bottom-left of new photo, still appeared on top-right!!! that's weird, because flipped camera upside down. dust saw @ top-right corner of frame should @ bottom-left corner of 2nd photo.

when flip camera upside-down, lens upside-down well, don't think it's dust in lens.

soooooo.....what's going on? :confused:
 

dust in viewfinder, maybe?
 


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