Archive 2022 · Help. 17-40 dust removal effective ?

Sunny Alan
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p.1 #1 · p.1 #1 · Help. 17-40 dust removal effective ?

Hello,
How good will be the lens after inside-dust removed ?
Any help in Grayson, Atlanta area, please ?

Aug 08, 2022 at 03:14 PM

Mike_5D
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p.1 #2 · p.1 #2 · Help. 17-40 dust removal effective ?

Dust inside lens doesn't matter. Don't pay someone to take apart a function lens for that.

Aug 08, 2022 at 03:34 PM

pokemeng
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p.1 #3 · p.1 #3 · Help. 17-40 dust removal effective ?

Here's some quick articles that look at how dust/obstructions affect the lens:

https://www.lensrentals.com/blog/2019/04/removing-fly-from-weather-sealed-canon-70-200mm/

https://www.lensrentals.com/blog/2011/08/the-apocalypse-of-lens-dust/

http://kurtmunger.com/dirty_lens_articleid35.html

Long story short. It probably does not show up in your images and definitely is worth the risk of lens disassembly.

Aug 08, 2022 at 03:43 PM

jcolwell
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p.1 #4 · p.1 #4 · Help. 17-40 dust removal effective ?

In the absence of more information, I agree with @Mike_5D and @pokemeng. It's very unusual to have the inside of a lens cleaned, unless it's a lot worse than some dust.

The following thread from earlier this year, includes links to many wide/ultra-wide lens comparison images, including the 17-40/4L.

Canon 17-40 f4 vs. 16-35 f4 (stopped down), https://www.fredmiranda.com/forum/topic/1754085/0#15928864

Basically, the EF 17-40/4L is as sharp as anybody needs in the centre, but not as good as landscapers would like in the corners (for those occasions when there's something there, and in focus, it happens).

Aug 08, 2022 at 07:42 PM

jcolwell
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p.1 #5 · p.1 #5 · Help. 17-40 dust removal effective ?

Can you post any sample images? There could be a problem, but it might not be related to dust.

Aug 08, 2022 at 07:45 PM

Robin Smith
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p.1 #6 · p.1 #6 · Help. 17-40 dust removal effective ?

Forget cleaning and just enjoy the lens. Unless it is REALLY filthy

Aug 09, 2022 at 01:47 PM

Herb
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p.1 #7 · p.1 #7 · Help. 17-40 dust removal effective ?

If you don’t see dust in the photos, no harm no foul. Not broke don’t fix it!

Aug 09, 2022 at 02:16 PM

RCicala
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p.1 #8 · p.1 #8 · Help. 17-40 dust removal effective ?

I'll throw in that disassembling this lens to clean it requires optical adjustment after. You may get back a cleaner lens that's worse optically.

Aug 11, 2022 at 07:26 AM

qc_mountain
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p.1 #9 · p.1 #9 · Help. 17-40 dust removal effective ?

Sunny Alan wrote:
Hello,
How good will be the lens after inside-dust removed ?
Any help in Grayson, Atlanta area, please ?

Get a used Canon 16-35f/4 and you will a happy camper they are much better opticly . It wont be too expensive on the market .

Francois .

Aug 11, 2022 at 06:12 PM


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