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Canon 100-400mm Dusk Specks  
User currently offlineEMA747 From United Kingdom, joined Jun 2006, 1171 posts, RR: 1
Posted (4 years 10 months 1 week 4 days ago) and read 4533 times:

I just received a Canon 100-400mm from a sale on fleabay. It appears on close inspection to have about 3 dust spots on the top left of where the glass narrows inside the lens. I know about the 100-400 being called the dust pump but what I want to ask is are the dust specks really a problem to image quality?

If not I will just leave it but if they are I might email the seller as it wasn't described as having dust speck inside the lens. Other than that it seems like a nice lens.

I'm not trying to scam the seller or be over picky I am just interested to know what effect the dust has and if you guys think I should do anything about it.

Andy S


Failing doesn’t make you a failure. Giving up and refusing to try again does!
8 replies: All unread, jump to last
 
User currently offlineWakeTurbulence From United States of America, joined Apr 2004, 1295 posts, RR: 16
Reply 1, posted (4 years 10 months 1 week 3 days 23 hours ago) and read 4529 times:

It shouldn't have an effect on the images. Dust can get stuck inside the lens elements, especially on a push/pull lens like the 100-400. I think there is some dust inside mine. Have you taken any test shots with it?
-Matt



Jetwash Images - Feel the Heat!!!
User currently offlineJakTrax From United Kingdom, joined Jun 2005, 4936 posts, RR: 7
Reply 2, posted (4 years 10 months 1 week 3 days 22 hours ago) and read 4511 times:

Andy,

I doubt dust will affect your images unless it's excessive but if you're worried Canon will take it apart and 'de-dust' it for you - although at a premium!

Karl


User currently offlineEMA747 From United Kingdom, joined Jun 2006, 1171 posts, RR: 1
Reply 3, posted (4 years 10 months 1 week 3 days 21 hours ago) and read 4480 times:



Quoting JakTrax (Reply 2):
I doubt dust will affect your images unless it's excessive but if you're worried Canon will take it apart and 'de-dust' it for you - although at a premium!

Yea it's the "premium" bit I'm worried about. I have read they charge about £130 for cleaning!

Andy S



Failing doesn’t make you a failure. Giving up and refusing to try again does!
User currently offlineDehowie From Australia, joined Feb 2004, 1060 posts, RR: 33
Reply 4, posted (4 years 10 months 1 week 3 days 14 hours ago) and read 4443 times:

This may sound a little over the edge and extreme but have you actually gone out taken a photo to "see" what the effect is.
I think that may a far better way of assesing any dust than asking us if your lens will have any visible dust in images.



2EOS1DX,EF14.2.8LII,17TS,85/1.2,16-35L,24-70LII,24L,70-200F2.8LII,100-400,300/400/500/800L
User currently offlineAC888YOW From Canada, joined Jan 2005, 536 posts, RR: 1
Reply 5, posted (4 years 10 months 1 week 3 days 14 hours ago) and read 4432 times:

I have a couple of visible specs in mine but they don't affect the images whatsoever.

I recommend against getting it 'cleaned' just for the sake of it. Once apart, these things never go back together exactly like they came from the factory.


User currently offlineDendrobatid From United Kingdom, joined Nov 2004, 1671 posts, RR: 62
Reply 6, posted (4 years 10 months 1 week 3 days 8 hours ago) and read 4396 times:
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HEAD SCREENER



Quoting JakTrax (Reply 2):
Andy,

I doubt dust will affect your images unless it's excessive but if you're worried Canon will take it apart and 'de-dust' it for you - although at a premium!

Karl

Karl/Andy

Lehmanns in Stoke (your home town Karl) are cheaper than Canon and approved by them. I got a quote at a shade under £100 but decided not to bother

I bought a used one too and that has a couple of dust specks too. They are unlikely to significantly affect the sharpness but they are very likely to cause flare if shooting into a light source. Get it cleaned and you will probably get another one the next time you go out !

Mick Bajcar


User currently offlineEMA747 From United Kingdom, joined Jun 2006, 1171 posts, RR: 1
Reply 7, posted (4 years 10 months 1 week 3 days 6 hours ago) and read 4379 times:



Quoting Dehowie (Reply 4):
This may sound a little over the edge and extreme but have you actually gone out taken a photo to "see" what the effect is.
I think that may a far better way of assesing any dust than asking us if your lens will have any visible dust in images.

I understand what you are saying and I don't think it has much effect on the image quality from the very crude test I did yesterday.
However I did ask the guy before the sale if it had any dust/fungus/scratches and he said no I didn't have any at all. Also it was described as absolutely mint condition. I think his reply was not totally accurate. If he has said yea it has a few dust specks I would have bought one from this guy on a photography forum at really is mint and would only have been another £20 more. I paid £900 which is only £200 off what I can get a brand new one for so I was really expencting it to be totally dust free. If it had been £800 or so then fair enough.

Quoting Dendrobatid (Reply 6):
I bought a used one too and that has a couple of dust specks too. They are unlikely to significantly affect the sharpness but they are very likely to cause flare if shooting into a light source. Get it cleaned and you will probably get another one the next time you go out !

So are you saying I shouldn't get it cleaned? I don't really have £100 to blow on cleaning anyway though.



Failing doesn’t make you a failure. Giving up and refusing to try again does!
User currently offlineDazbo5 From United Kingdom, joined Mar 2005, 2921 posts, RR: 2
Reply 8, posted (4 years 10 months 1 week 3 days 5 hours ago) and read 4367 times:

My 50-500 is full of dust after using it in Kenya earlier this year. It was cleaned about 18 months ago when it was in for repair at Sigma as a freebie, but it doesn't take long for dust to start appearing again. I've never noticed any issues so would save the money and not bother. I've used it with apertures down to f/22 and haven't seen any issues.

Darren



Equipment: 2x Canon EOS 50D; Sigma 10-20 EX DC HSM, 50-500 EX APO DG, Canon 24-105 f/4 L, Speedlite 430EX
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