blow out........

[donky7]

on my 50d, which i've had for a few month now, i found a strange object in the view finder, upon inspection of the images theres nothing on these.. but still viewable through the eye piece.

having purchased a blower, this cured the half of cheese cob.....

do you guys, n gals....

blow out on a regular basis or just when and required....???

thanks....... martyn.