Originally posted by brewmaster15 HI Mike,
Nice to see you posting again, missed seeing you around!
Thanks, Al
I needed a break. After four months, I thought I'd tentatively dip my toe back in the forum waters once more - but I'm being very choosy which forums and threads I get involved in. I'll see how it goes
Originally posted by brewmaster15 I do understand that "WR" isnt water proof and air does get sucked in and out and how lens works. Though I agree that something that size is not going to be an issue on the front element.. I can't see something that size getting sucked into the len past a WR seal.. especially between the two front elements as that appears from the image. I Suppose its possible but if so.. the WR sealS on the plm would probably be of little use against moisture of any kind getting in due its small size. I would not call that debris in images "dust "... it looks pretty.large. again not going to affect the image but the question is whats it indicative of?
I think we can all sometimes over-estimate the quality and effectiveness of WR lens "seals" (for want of a better word). In many (most?) cases, they're just simple foam rings sandwiched between the barrel components. They'll reduce the likelihood and quantity of moisture, dust and/or debris getting in (especially the latter), but suction due to zooming is quite likely to overcome that resistance... and I
do think it's possible for debris that small to work its way between the barrel and the foam ring. Perhaps not especially
likely, but
possible.
If the debris has come from the manufacturing process, I'm wondering if it's tiny slivers of the adhesive backing strip from the WR foam ring, or else dried adhesive, similar to the issue with my DA18-270...
Originally posted by brewmaster15 The op says he has had the lens since Feb.. 3 months and its should be under warranty if bought new.. if it were me I would send it in for warranty because 1) I would question the lens WR and 2) if it was in there from mfg..it could indicate other potential issues even if its not going to cause image degradation by itself.
Generally when one buys a new lens we want one without complimentary debris.
If the lens was bought used.. I would just leave be.. shoot it and not worry much as its not going to affect the image directly.
Al
As an add thought here.. looking closely at the pics. Second image shows 2 of those similarly sized debris particles. That to me indicates more of a chance they are from mfg..just an observation on my part.
Yes, I noticed that second piece too. In all honesty, I hadn't fully read the OP's post to the end, and didn't realise the lens was almost new (my bad
). I guess I wouldn't be overjoyed if my four-month-old lens had debris inside, and like you I might choose to have it serviced or replaced under warranty. That said, I might also keep using it for a while to see if the problem gets any worse before sending it for service nearer to warranty expiration... I've had lenses that came back from service with worse optical performance than they started off with, so if a problem is minor enough that it doesn't affect my use and expectations of a lens, I'm likely to accept it. That's just me, though...