Dust
Are the dust specks in the same place on every image? Are they a lot more apparent at small apertures than large ones?
If so, it's on the sensor, not the lens.
You have three choices:
- Blower (just tends to move dust around, except with very large lumps)
- Arctic Butterfly (search for it - expensive, but good for dust that isn't stuck)
- Wet clean (swabs and fluid - sounds scary but isn't.)
There are lots of threads giving excellent advice on this one on this forum.
Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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Michael
its strange as I have shots where dust is present but then on the next they are not, even when taking shots of sky etc and I haven't changed the lens. I've been out all day today and 90% of my shots are cream crackered
Post a couple so that we can have a look.
As I say, sensor dust is a lot more obvious at small apertures. And on plain backgrounds.
Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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Chris has asked a couple of pertinent questions about the nature of the dust spots, and pointed out when they are most visible.
Maybe you could post a couple of examples so we can help you further. Do read Chris's questions and come back with an answer.
How do I post an image to the forum?
In anticipation of your question, I posted a link to the 'how-to' notes on exactly that in my earlier reply.
Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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Use that by pointing the camera at a blank wall and it will save a dust alert image. It's fully explained in the camera manual.
Should help prove it one way or the other.
John
The K-5 has a 'Dust Alert' setting (in screen 4 of the Set-up menu)
Interestingly it has never worked for me. Dust bunnies all over photos, clearly on the sensor - I can see them with my sensor loupe - but Dust Alert doesn't .
Regards,
Jeeess
What's the best way to clean this lens, or is it bin fodder?
my flickr
buy images
but on closer inspection of my lens (18-55 mk2) I notice a fair amount of dust on them
This proves nothing. Dust on the lens does not appear as a speck on the image.
and there's none on the Dust Alert screen.
This also proves nothing. The dust alert is not guaranteed to show up sensor dust, as Gwyn has mentioned.
Take two pictures, one with each of two lenses, of featureless blue sky or cloud. At small aperture (eg F22), thus ensuring that the shadow cast by the speck of dust on the sensor is as small as possible.
Upload the pictures to your computer, and increase the contrast dramatically, thereby making the specks a lot easier to see.
If the specks are in the same places, it is sensor dust.
What's the best way to clean this lens, or is it bin fodder
If you're really convinced the problem is the lens, I'll be more than happy to take it off your hands. Heck, I'll even pay the postage.
Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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6 posts
12 years
Michael