Its too late I chickened out. But I have learnt a lesson, I am not gonna check my sensor for dust again until I see them on my pics... I once I knoe they are there I don't want them lol x x
Sometimes you don't see the spots on your images. :shrug:
When I show people how to check for spots, and they find them, I seem to get the blame.

Like there was no spots until I showed them how to see them. When they go back and check their images, the spots that were always there on their images, but they never noticed, suddenly appear.
I would recommend checking for spots at most monthly, and definitely before an important shoot.
I always show
this video to give people an idea of what is involved with cleaning sensors. The sensorscope mentioned in the video I consider an optional expense, which I chose not to make. I like the guys style though.
The Rocket Air Blower worked for me for dust for about 3-4 years before I had some dried liquid which was never going to be blown off. I chose to save the money and do it myself.
If you do get it done in a shop have test images showing the dirty state of the camera, and confirm that if there is damage done by the shop, that your camera is insured.
I read a couple of months ago about damage done by a shop who then said that the sensor was already scratched, and they wouldn't pay to repair.
