Dust???

r1flyguy

r1flyguy

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Hi all

How can you tell if there is dust IN the lens?

The reason I ask is I've just bought a 10-22 canon lens fom a forum member and there is clearly a 'white dot' in the lens :shrug:

The lens is in 'ok' cosmetically condition & works ok considering how poorly packaged it was but cannot see the mark on the photos albeit I don't know how best to test it.

How is it best to see if the 'white mark' is appearing in the photo & is it dust

Your comments & recommendations are welcome before I question the seller

Cheers
 
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If it really is just a speck of dust... stop worrying about it. It will make no difference. You can't stop dust getting inside lenses eventually - they're not sealed airtight or anything, and dust will find it's way in. Unless it is really terrible, and filled with the stuff, it will make zero difference.

If you're worried post up a pic of the offending particle.
 
Shooting a plain background at the smallest apperture and see if you can see anything, highly doubtful you will as it has very little effect on the image. I am sure someone will come along and post the lens hire company images from the lens with a smashed front element soon to highlight the point.
 
r1flyguy said:
Hi all

How can you tell if there is dust IN the lens?

The reason I ask is I've just bought a 10-22 canon lens fom a forum member and there is clearly a 'white dot' in the lens :shrug:

The lens is in 'ok' cosmetically condition & works ok considering how poorly packaged it was but cannot see the mark on the photos albeit I don't know how best to test it.

How is it best to see if the 'white mark' is appearing in the photo & is it dust

Your comments & recommendations are welcome before I question the seller

Cheers
Click to expand...

If there is a spec in the lens and it looks like dust, then it will be fine and won't cause you any problems, unfortunately, a lot of lenses are prone to collecting this, the Canon 17-55 and 100-400 for example.Other than being a nuisance, it shouldn't cause any problems...

The only time I would be worried and concerned would be if the white dot was larger than a spec and you were thinking it maybe mould...
 
I've had dust in a lens before and really as long as it's just a speck you aren't going to notice anything, try taking a picture of a white piece of paper and see if you can spot any problems.
 
anything that shows up on paper/plain wall tests is likely to be on your sensor.

if you're still worried about it take two shots with different lenses and anything different between them is due to your lens not the sensor
 
My Nikkor 105mm f2.5 AIS is full of dust, and the coating on the front element as marks on it. Still takes sharp contrasty pictures though. Stop worrying and start using.
 
Shoot the white blank paper page, it will tell what is wrong lens or sensor
 
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