cleaning a lens method ?

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wildman

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Jav
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I think one of my lens has picked up some dust. Its deffiantely not inside the lens and deffiantely not on the snsor as when I change lens the specs don't appear in any pictures.

I have got a lens pen and some lens cleaning fluid, should I sue thi or try to just dut it off with the brush end of the pen ? Also do you clean both the front and the rear that goes into the mount ?

Sorry for such an idiotic question but I don't normal change lens when I am out but I saw a landscape I really wanted to capture and it wasn't going to happen with my 70-300 so I changed out in the wild and now I think there is some dirt on the 17-50 I changed to :(
 
I'd be surprised if you are seeing dust on the lens in your images, somewhere there's a test where they stuck 1/4inch wide bits of paper on and in a lens and they only made a slightly darker patch.
Are you looking for sensor dust shot at small aperture against a bright colour like sky - with both lenses.

A rocket blower is the safest way of all to blast off any dust since you don't even touch the glass. I have one in the bag and if not in a hurry will blast the camera end of a lens before fitting.
Don't forget inside the cap, easy to overlook and gets messy.
 
It's not an idiotic question.

This is what I do in this order:

1) Use a blower to remove any loose dust from front and rear elements.
2) Use a dedicated lens brush to gently remove slightly more stubborn crud. This is often all that is needed.
3) If stickier muck is still there, use a Pec Pad or microfibre cloth moitened with a little Eclipse cleaning fluid and very lightly wipe the lenses from centre to edge.
4) Blower again and lastly follow up with a quick wipe with a dry microfibre cloth. Job done!

It's worth noting that specks on the front element will rarely show in an image whereas specks on the rear element almost certainly will.:thumbs:
 
Dust on or in the lens will not appear in any images.

If you have marks appearing, they're on the sensor. But they only show up at high f/numbers, usually against a plain background like sky. Use a lower f/number and they're usually invisible. Or clone them out. Or clean the sensor.

Easy enough to check. Try this - put a tissue over the lens, focus on infinity, highest f/number eg f/16 or f/22, exposure mode on aperture priority. Shutter speed doesn't matter. Point camera at the sky. To compare, do the same at lowest f/number and the marks will probably disappear.
 
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