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01-10-2010, 08:31 AM   #1
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Cleaning the dust inside the lens

I dunno if this has been discussed b4.
How can you remove the dust inside the lens? heres a pic


Last edited by rustynail925; 01-31-2010 at 07:43 AM.
01-10-2010, 08:46 AM   #2
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QuoteOriginally posted by rustynail925 Quote
I dunno if this has been discussed b4.
How can you remove the dust inside the lens? heres a pic
You don't. Huge chunks (or dead bugs ) can show up in the circles of confusion. Otherwise, don't worry about it.
01-10-2010, 08:59 AM   #3
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How can i prevent this happening to my other lenses? Does the dust degrade the lens?
Thx
01-10-2010, 09:10 AM   #4
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QuoteOriginally posted by rustynail925 Quote
How can i prevent this happening to my other lenses? Does the dust degrade the lens?
Thx
Zoom lenses or primes that are not internally focusing suck air in and out. So you can't prevent this for these types of lenses. Large dust particles can appear in the circles of confusion, otherwise they don't affect the image at all.

http://www.flickr.com/photos/17228033@N00/1272499532


Last edited by asdf; 01-10-2010 at 09:15 AM.
01-10-2010, 09:26 AM   #5
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They will not degrade or damage the physical lens in any way (as long as it's not mold), so really there's nothing to do about it. If they're huge pieces that show up in the bokeh, you can get it professionally cleaned. Otherwise, it's just part of having this hobby.
01-10-2010, 09:49 AM   #6
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That's not dust, that's just an indication that you use your equipment.
Seriously, you can have a huge amount of dust in a lens and not suffer image degradation.
And you will not EVER see dust in the lens as a discreet spot on a picture unless you are doing micro photography and are focusing inside the lens.
01-10-2010, 10:02 AM   #7
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of course you know take lens apart to clean out interior dust

most important is store lenses in a low humidity environment so mold and fungus spores present on most dust particles do not germinate and grow --- AND --- always remember and do: before moving cold equipment into a warm environment, seal it in an airtight container (plastic baggie) and let it warm before unsealing it, to prevent condensation.
01-10-2010, 10:09 AM   #8
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Be afraid of fungus and not dust.

01-10-2010, 12:31 PM   #9
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QuoteOriginally posted by GerryL Quote
Be afraid of fungus and not dust.
And sand. I have cleaned out a few lenses which have ingested sand and it can make the focus very stiff and cause a lot of wear to the focus helix if its used a lot before the sand is removed. It is annoying to know your prized lens has dust in it but it really doesn't have much effect unless there is an awfull lot of it.
01-10-2010, 07:38 PM   #10
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I was kinda worried.. not anymore. Thx for all the infos.

Got some more Q.
1 Whats the purpose of the hood does it helps in the Image quality or just
for protection of the lens?
2 How often do you clean your gear, what gear is it and what part of the gear is it?
01-10-2010, 08:37 PM   #11
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Main purpose is to reduce flare - keeping stray light out of the lens. Protection is a nice side benefit, though.

I clean things that look noticeably like they need it, which is to say, not unless I've done something to them to make this necessary (eg, using in muddy conditions, etc).
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