Random shots from my new T2i/550D, C & C welcome

[Lazy Photographer]

To see if you have sensor dust, set your camera aperture to the smallest (larger number i.e. f/22). Point it at the sky and take a photo. If you have sensor dust, if should show on the photo.

If you see the dust while you are looking through the viewfinder, the dust maybe on the mirror which will not affect the photo.

What's funny is that while I see two distinct dots in the viewfinder, the photo below shows a few more that I don't see in the viewfinder. The two images below are the same, but the second has been lightened a bit.

1.

2.

3. This one's a crop and I mucked around with it to make the dots stand out.

 

[Lazy Photographer]

Any thoughts on the above dust test photos?

 

[Dao]

If you see the dusts on the photo, most likely they are sensor dust. Dust on lens normally will not show up on the end result. And dusts visible through the viewfinder usually are dust on mirror and they have no impact on the photo because the mirror will flip up while sensor is exposed.

So based on the photo, I will blow some air to the sensor. Search around for "how to".