Hi all, i keep getting this " hair" like thing on my landscape photos. i already blown and cleaned the filter on the lens. and also the outer glass of the lens. I am sure it is not on lens.. as i have interchanged lens to find the source. It appears on all my long exposure landscape photos.. when i use f 8 onwards and exposure more than 3 seconds. the dust doesnt appear on my fast lens ..when i do my street shooting. could it be on the sensor or the mirror?? if it is .. can i clean it myself ?? any guys,, can help?? thanks in advance.