EMA747
Topic Author
Posts: 997
Joined: Sat Jun 03, 2006 6:01 am

Canon 100-400mm Dusk Specks

Thu Dec 17, 2009 5:30 pm

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!
 
waketurbulence
Posts: 1264
Joined: Sun Apr 18, 2004 12:33 pm

RE: Canon 100-400mm Dusk Specks

Thu Dec 17, 2009 5:43 pm

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
 
JakTrax
Posts: 4654
Joined: Thu Jun 30, 2005 3:30 am

RE: Canon 100-400mm Dusk Specks

Thu Dec 17, 2009 6:51 pm

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
 
EMA747
Topic Author
Posts: 997
Joined: Sat Jun 03, 2006 6:01 am

RE: Canon 100-400mm Dusk Specks

Thu Dec 17, 2009 8:27 pm



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!
 
Dehowie
Posts: 1068
Joined: Wed Feb 18, 2004 8:41 am

RE: Canon 100-400mm Dusk Specks

Fri Dec 18, 2009 2:41 am

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
 
ac888yow
Posts: 394
Joined: Thu Jan 20, 2005 12:29 pm

RE: Canon 100-400mm Dusk Specks

Fri Dec 18, 2009 3:17 am

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.
 
dendrobatid
Posts: 1645
Joined: Sat Nov 06, 2004 3:40 pm

RE: Canon 100-400mm Dusk Specks

Fri Dec 18, 2009 8:45 am



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
 
EMA747
Topic Author
Posts: 997
Joined: Sat Jun 03, 2006 6:01 am

RE: Canon 100-400mm Dusk Specks

Fri Dec 18, 2009 11:00 am



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!
 
dazbo5
Posts: 2717
Joined: Tue Mar 29, 2005 8:05 am

RE: Canon 100-400mm Dusk Specks

Fri Dec 18, 2009 12:30 pm

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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