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DPChallenge Forums >> Hardware and Software >> Lens + Sand = Bad! Help?
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08/24/2005 10:25:57 AM · #1
Well, during my wonderful trip to La Jolla this past weekend I was so concentrating on trying to shoot the sunset on the beach that I didn't properly care for my equipment while trying to quick change lenses and dropped my 100mm f/2.8 in the sand with both end caps off!

My husband is pretty darn handy so we're wondering if taking apart a lens to clean is something fairly simple and he could manage it, or should I just leave it to the pros and take it into the shop?

To make matters worse, my sunset pics sucked! lol

Edit: Grammer

Message edited by author 2005-08-24 10:50:18.
08/24/2005 10:46:48 AM · #2
I have no experience of taking lenses apart but I can't imagine it's very wise for such precision instruments, I'd take it to a pro myself.

Whatever you choose to do I hope it works out ok!
08/24/2005 10:50:33 AM · #3
I wouldn't reccommend trying to take apart a good lens at home, no matter how handy one considers themself. I am good with most such things but wouldn't attempt a lens unless I was willing to sacriface it completely. It may be costly but you are better off letting an experienced pro do it for you.

Google "lens repair" and you'll find many besides the maker who can do it. Most are probably cheaper and maybe faster, and closer to you.
08/24/2005 10:50:53 AM · #4
Did sand actually get inside? When you turn the focus ring do you hear grit crunching around?

In any event, unless you are trained to do so, taking your lens apart is probably a bad idea. I'd take it to an authorized repair shop, tell them what happened and let them handle it.
08/24/2005 10:53:03 AM · #5
Originally posted by Spazmo99:

Did sand actually get inside? When you turn the focus ring do you hear grit crunching around?

In any event, unless you are trained to do so, taking your lens apart is probably a bad idea. I'd take it to an authorized repair shop, tell them what happened and let them handle it.


I'm not even attempting to turn anything at this point - I don't want to make anything worse. At the bottom part of the lens, there is some sand that got inside. I'm sure it didn't go that far up, but over time even one grain of sand could cause future problems so I don't want to use it until it's been cleaned out.

It seems the general consensus is take it in. There is a pro shop in town and I believe they are Canon authorized so I'll take it to them.
08/24/2005 10:53:20 AM · #6
unless sand got inside the lens i would just use a blower to clean it. Pushing rocks around glass with a cloth doesn't sound like a good idea to me though...maybe a vaccume?
08/24/2005 10:53:59 AM · #7
Is it damaged? Seems that even when dropped in the sand it should be all exterior. Can't you let it dry, blow it off good with a Rocket and tehn use lens cleaner to clean the lens glass and warm wet rag to clean the outside?
08/24/2005 10:55:02 AM · #8
We already let it dry and used a vacuum ... but there is still sand both stuck to the glass (bottom element, front had a filter on thank goodness) and just barely inside the lens.
08/24/2005 10:55:53 AM · #9
Just try to blow off the sand. If it is inside take it to the pro.

Or try this:
//www.hermes.net.au/bayling/repair.html

Nick
08/24/2005 10:56:41 AM · #10
Even if you were 'handy' enough to take apart and clean your lense, most people do not have a clean room with the proper air flow to prevent dust and such from getting in once you have it apart. Sure, you may get the sand out. But what about the dust you would be letting in?
08/24/2005 11:01:43 AM · #11
Originally posted by Alienyst:

Even if you were 'handy' enough to take apart and clean your lense, most people do not have a clean room with the proper air flow to prevent dust and such from getting in once you have it apart. Sure, you may get the sand out. But what about the dust you would be letting in?

Excellent point and one I had not considered!!
08/24/2005 11:14:09 AM · #12
I'm guessing the back end is sealed so no sand should get inside the lens??? My concern is getting all the sand out of the back so it doesn't end up in the camera some day.

I ran the focus through and there is no interference.

I don't want to blow compressed air into it to get the sand out because that could lodge the sand into a place where it is more difficult to remove or cause damage. There are a few grains that I can see wedged on the outer diameter of the protruding ring. Everything else I have been able to get. I'm thinking I'll try dislodging them with a thin wire and try to suck them out.

Am I correct in thinking that the lens is sealed and it would be nearly impossible for sand to get into the guts?
08/24/2005 01:59:25 PM · #13
I can't imagine a lens of that quality to be sealed so poorly that a grain of sand would get in. I mean they try to seal them so dust and water vapor does not get in. But a wire ..... you better have steady hands to avoid scratching the glass!
08/24/2005 02:11:03 PM · #14
The sand that is left is in a place where I would not worry about touching the glass. It's far enough away.
08/24/2005 02:12:24 PM · #15
when you think about it, your lens is really just made of sand in the first place so it's not all THAT bad!

maybe that lonely grain was trying to find some of its long-lost brothers and sisters. :P

seriously, i would have a pro do it. the post about getting more stuff in it than out of it is spot-on. besides, when has anyone ever taken anything apart and gotten it back together perfectly? i have a tent that, to this day, i cannot figure out how it all fit in the little nylon bag that came with it. it's a conspiracy, i say!
08/24/2005 10:48:59 PM · #16
I wouldn;t attempt a lens like that.
I know when I was younger my dad repaired a 60-200mm lens, and later on dissasembles and reassembled to clean, and he still uses that lens today (over 10 years later) with photo's coming out perfectly sharp, no bad side to it at all.
although.. manual apature, manual focus, and it took him about a full day both times....

but me doing that.. never, I'd have a little pile of rubbish from what was once $1000's of glass.

IMO, not worth the risk, send it off to a pro.
08/24/2005 10:59:19 PM · #17
Ok..whose lense is this? The thread was started by tfaust but louddog seems to have taken over the problem...
08/25/2005 10:36:38 AM · #18
If you check tfaust's profile, you find that Louddog is her hubby.

Louddog: When you were vacuuming, were you using a blower or something to try to dislodge the sand at the same time? That might be a safe way. Be careful of letting the lens get sucked in though! Velvet taped to the edges of the vacuum just in case?

Message edited by author 2005-08-25 10:38:38.
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