Anuar, its not possible for a large spot of dust to appear like this on wide apertures. I think TS should clarify if he had mis-info everyine on the circumstances leading to this spot so that in future, no one reference off this thread n learn the wrong thing.
TS is pretty misleading to say he/she shot these at wider apertures when the exif data shows f/22.. seems like he/she dunno the basics well enuf yet :sweat:
TS, try blowing the sensor first. there's this function in ur menu "Clean sensor manually" whereby the mirror will lock up and the shutter curtain opens, revealing the sensor. mount it on the tripod first, make it point downwards and blow the sensor with a blower. if the spots still appear at f/22 then bring it down to NSC n get it cleaned.