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11-21-2015, 02:04 AM   #1
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Used DA* 60-250mm, strange "dust"?

I've purchased a used DA* 60-250mm which is doing a fine job with pictures, but has some rather odd "dust" on the focusing element. It's nothing that I expect to affect picture quality even remotely, BUT:

1) These lenses are supposed to be dust sealed, so is this a sign that the weather sealing is fubar?

2) One of the two debris is pure white and squiggly, almost like a hair, but clearly not a hair (super magnified it has a split on the end). The other is much darker and a little fuzzy around the edges. Neither really looks like dust - doubt it would be fungus?

3) A "larger" (relatively) white flake appeared on the focusing element out of nowhere. It actually came off by just clicking the focusing ring back and forth. Makes me wonder what else is in there...

That said, I imagine I'm probably worried about nothing, but I *can* return it for a few more weeks if it seems wise. Has anyone else had experience with this lens and can comment as to how ridiculous I am (or am not) being? I can get a picture of the strange squiggly bit tomorrow...

Edit: I've added an image. Larger dark speck focused as well as I could, "squiggly" bit is in the upper left. As far as scale goes, the other tiny specks are more what I was expecting to see...

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Last edited by Shinra; 11-21-2015 at 12:15 PM. Reason: Added image
11-21-2015, 07:00 AM   #2
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Hi Shinra, it would be helpful if you could post some images of the specks. Also, What do you mean by focusing element? Usually I wouldn't expect that "flakes" of any kind appear out of nowhere inside the lens when the focusing clutch is moved, so that's certainly not normal.

Ben
11-21-2015, 12:16 PM   #3
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Yes, the flake had me a bit surprised - I had seriously wondered how I missed it and then it was gone just as fast. I added an image above along with further details. The "spokes" on the larger black speck have me slightly worried...

I suppose "focusing element" may be inaccurate, but when I turn the focus ring, these particular things turn with it. Zooming does not change their depth relative to the rear element.

Last edited by Shinra; 11-21-2015 at 12:19 PM. Reason: Answering the question :)
11-21-2015, 04:27 PM   #4
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If it was an ultra wide lens I'd be more concerned about them affecting your photos (closeup + ultra wide + stopping down = interior of lens could be sufficiently in focus to make them display).

With the 60-250, I'd only worry if they make the lens flare when you're shooting into the sun.

11-21-2015, 04:50 PM   #5
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top blotch looks almost like a shaving of some sort.. maybe a plastic? Do the focus or zoom rings grind any?
11-21-2015, 07:10 PM   #6
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Top blotch could definitely be plastic. No noticeable grinding, just some very slight resistance at 135mm when zooming in, but perhaps that explains things? I don't notice it when zooming back out.

Last edited by Shinra; 11-21-2015 at 07:11 PM. Reason: emphasis on "slight"
11-22-2015, 12:42 PM   #7
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From the image I would guess, yes some dust and "flakes", but no fungus or the like. But the halfmoon part at the top, shouldn't be there. I don't have that particular lens, but it isn't a cheapo one, so the zoom ring should turn smoothly all along. If there is a certain point with higher resistance, that is not correct.

Ben
11-22-2015, 01:54 PM   #8
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looks more like an eyelash to me, but could be anything

11-22-2015, 03:03 PM   #9
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QuoteOriginally posted by Shinra Quote
just some very slight resistance at 135mm when zooming in,
That is normal for the lens.
11-22-2015, 06:52 PM   #10
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QuoteOriginally posted by Ex Finn. Quote
That is normal for the lens.
Good to know! Sounds like everything is fine... Haven't noticed any significant flaring. The random white flake is still odd, but seemingly no big deal. Thanks for all of the help everyone!
11-22-2015, 08:28 PM   #11
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I might be wrong but that sounds and looks like Fungus to me.
11-22-2015, 11:09 PM   #12
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QuoteOriginally posted by hjoseph7 Quote
I might be wrong but that sounds and looks like Fungus to me.
What are you referring to in particular? The black speck? Someone else (dcshooter) mentioned in PM that it looked more like a speck of paint or plastic that's worn off and worked its way onto the lens - I'm willing to bet he's right given he services lenses regularly, but no idea myself.
11-23-2015, 04:46 AM   #13
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QuoteOriginally posted by Shinra Quote
Makes me wonder what else is in there...
...just don't feed it after midnight, don't say I didn't warn you.

QuoteOriginally posted by hjoseph7 Quote
might be wrong but that sounds and looks like Fungus to me.
It doesn't to me, and I have successfully repaired a few lenses that actually had fungus issues in my time. With lenses like the 60-250mm air is going to move around when you zoom, which causes the elements inside the barrel to move, the seals have to let the air out otherwise the zoom mechanism isn't going to be smooth. So it is pretty much inevitable that lenses get dust and crud in them, but the 60-250mm is nothing compared to the old push pull zooms like the Canon EF 100-400mm f/5.6L - that thing could do double duty as a dustbuster.

Last edited by Digitalis; 11-23-2015 at 04:56 AM.
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