Christine,
I've never gotten so involved with sand, only a little at a time.
I'd use a wet cloth and brush to remove all the loose sand I could.
I'd exercise all the switches on the body to make sure all the sand is out.
I don't think water or sand can make it past the doors on the body
like for the sd card.
The flash is going to be difficult to clean-up.
As for the Sigma lens, I have no experience.
It's pretty hard to keep sand out of lenses.
You'll have to patiently work your way thru it.
Regards,  Bob S.

On Tue, Jul 27, 2010 at 9:52 AM, Christine Nielsen <[email protected]> wrote:
> While I was in the water with my kids yesterday at the beach,  a pack
> of seagulls descended on our pile of gear in search of food.  To bring
> my camera to the beach, I had taken the foam camera bag insert from my
> handbag, in which it usually resides, and placed it inside a plastic
> grocery bag, tied shut, to keep the sand and water out.  I placed that
> whole mess inside our beach bag, safely nestled among the towels, etc.
>  There was no food in that bag.  But that didn't stop those winged
> varmints from looking!  I think they have learned that plastic grocery
> bags usually contain food (last week, I saw a gull fly off with a bag
> of snacks from a family's stash), so when they found the one with my
> camera, they pulled it out, dragged it across the sand, and opened it,
> unceremoniously dumping out the contents.  Imagine my horror upon
> finding the business end of my lens half-submerged in sand, surrounded
> by hundreds of webbed foot prints!
>
> I did my best to carefully brush off the sand.  It was everywhere.
> The on/off switch was "sticky" at first, but that seems to have worked
> itself out.  Does the AF sound noisier than before?  Am I imagining
> that the shutter sounds clankier?  Argh!!
>
> So here's my question:  now what do I do?  Is it possible that tiny
> grains of sand could get in there & gunk up the works?  My camera -
> the k7 - is "weatherproof".  The lens - a sigma 17-70 -- makes no such
> claim.  I've removed the sd card, carefully inspecting and removing
> with a brush any grains of sand around the door.  I figure I should do
> the same with the lens... but are there other steps I should be
> taking?
>
> OTOH, everything seems to be working, I had a UV filter on my lens...
> and luckily - I'm guessing those gulls shoot Nikon.
>
> :)
> -c
>
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