Condensation on the inside...!

[shiato storm]

...just wondering, I have a 24-70 that I used in pretty heavy rain a while ago in wales (several months now), I think heavy mountain down-pour would be the best description. the next day I go out to use it, set everything up and see its all fogged up - having shot in cold conditions I figured it was on the front element so turned it round to look at it but to my surprise it was on the inside of the lens! frustrated this should happen on a sealed L lens I stuffed the camera back into the bag and headed home...one way to notch up a wasted trip :bang: (before you ask I use a 1dmkII which is also sealed - used with another sealed lens the idea is its pretty tough against the weather...usually)
SO, a welsh down pour has obviously caused a bit of water to get in somewhere I'm thinking...not had anything go wrong or any defects occur, or any further condensation for that matter, since this singular incident, so was probably nothing. I suspect that the quantity of water was so slight it evaporated out of the back shortly after the event, plus my bag is stuffed with a number of silica gel packs to keep moisture out, but I'm wondering, on a 'weather sealed lens' there seems to be a failure somewhere for this to have occurred...have seals been known to 'go' on lenses and require a check-up?
any idea what they cost to repair?

 

[ranarama]

I've never thought my 24-70 was actually 'weather sealed' as the end moves in and out when you zoom unlike say the 70-200 which is a fixed length.

Can't halp you with advice about the repair though.:shrug:

 

[George]

Well, I don't have a 24/70 but been out with my 24/105L in some good old Scottish downpores and not had a problem, I will ask a Canon guy at Focus on Sun and see what he says, if I get any joy I'll report back.

 

[Chappers]

I agree that the 24-105 isn't "weather sealed". If it gets wet I break out the camera covers
http://www.speedgraphic.co.uk/prod.asp?i=17510&1=Op/tech+Rainsleeve+(2).

Hopefully your lens has dried out by now

 

[Witch]

Is this one of the lenses which requires a filter on the front to complete the sealing? :shrug:

 

[shiato storm]

Well, I don't have a 24/70 but been out with my 24/105L in some good old Scottish downpores and not had a problem, I will ask a Canon guy at Focus on Sun and see what he says, if I get any joy I'll report back.

that would be most helpful if you could, thanks!

Is this one of the lenses which requires a filter on the front to complete the sealing? :shrug:

thats the 'ultra-wideangles' such as the 17-40 and 16-35 L's that need the filter up front...the others either don't change length when they zoom or are primes.

 

[Sadlybrokeboy]

Right - stupid question - I've not heard this point about the "ultra wides" requiring a filter to "complete the sealing"...what filter should be used and how sealed does it become?

Sorry for taking this slightly OT and for the daft questions!

Matt

 

[shiato storm]

not a too daft Q. the 17-40 and 16-35 have front elements that slide in and out within the front section - but the overall length of the lens is not changed. I believe the general idea is have one of those pro/thin UV filters up front that does virtually nothing to prevent image quality, and the thread acts as a seal if you're working in nasty conditions...