stevestuff Posted November 11, 2004 Share Posted November 11, 2004 I am looking forward to taking pictures this winter. I am concernd about condensation issuse with my new Canon "L" leses and wondered what the approach is to avoid condensation when you take your camera from a warm environment into a cold environemnt or vis versa. Link to comment Share on other sites More sharing options...
frank uhlig Posted November 11, 2004 Share Posted November 11, 2004 Let the camera/lens adjust to the new temp slowly. If I walk from a cold room 60 degrees into summer 100 degree weather, my glasses always fog up, those on my nose. But the ones in my case do not fog if I take them out a while later. Same principle works for lenses. So wait to take your lens out; 2 minutes or 20 depending on degree of temp change. Link to comment Share on other sites More sharing options...
jbq Posted November 11, 2004 Share Posted November 11, 2004 What Frank said. In addition: -Most condensation happens when placing a cold object in a warm place. -When going from a warm to a cold place, the problem is with the moisture in the air that is trapped in the lenses. If you seal your lenses in a zip-loc while in the cold, take them inside (without opening the zip-loc) then take them back outside and re-open the zip-loc outside you should be fine. -Be careful not to breathe on your cold lenses. Link to comment Share on other sites More sharing options...
paul ron Posted November 11, 2004 Share Posted November 11, 2004 Keep the camera under your coat till you are ready to shoot. If you are camping out, be sure to keep the camera in your sleeping bag with you so it stays warm. My frineds have used solid fuel hand warmers in their packs to keep the camera equipment warm with good results. The more you say, the less people listen. Link to comment Share on other sites More sharing options...
manuel_garcia5 Posted November 12, 2004 Share Posted November 12, 2004 The advice you received it right on the mark. Condensation is more of a concern when your in a humid climate. Going from your hotel room with the A/C blaring into the heat and humidity. That's when you really have to be careful. Link to comment Share on other sites More sharing options...
david_h._hartman Posted November 12, 2004 Share Posted November 12, 2004 When a cold object is moved to warm air there is a convection flow of air that flows down the side of the cold object. This brings more warm air in contact with the cold object. Warm air can hold more moisture but as its cooled it must give up that moisture as condensation to the cold object. It doesnt much care if its a glass of iced tea or your lens. You need to stop the flow of air. <br> <br> One of the easiest ways is to use a plastic bag. If you dont have that you could wrap the lens in a clean dry bath towel. Thats one from the closet not one hanging by the shower door! Anything that is dry (really dry) and stops the air flow will do the trick.<br> <br> The towel will also provide insulation so the lens will warm up slower than in a plastic bag especially if most of the air is squeezed out of the bag. A Zip Lock back limits the amount of moisture to volume of warm air when the bag is closed. A dry cleaning bag can be twisted on both ends to limit the supply of warm moist air. Id only use a dry insulator like a towel if a clean plastic bag is not available.<br> <br> Regards,<br> <br> Dave Hartman. Link to comment Share on other sites More sharing options...
john v. Posted November 12, 2004 Share Posted November 12, 2004 I agree with the method of putting the camera in a plastic bag when taking it inside from the cold outdoors. A trick I found usefull when travelling in hot and humid locations (I figured this out in Guangzhou, China this past August - the place was like a suana outdoors) is to heat up your camera gear with a hair dryer. You don't have to get your gear hot, just warm enought so its close to the outside temperature. Do this just before going outside and condensation shouldn't be a problem. Link to comment Share on other sites More sharing options...
david_h._hartman Posted November 16, 2004 Share Posted November 16, 2004 A little more on insulation. First its not really anadvantage over a plastic bag. Its a stop gap. Second theway it works is it stops the convection flow of air. Inside thewalls of your house you many have fiberglass. Its light andit impedes air flow. The more density a material the faster heatcan transfer. You get cold in 27?C (81?F) water but not in airof the same temperature. Primarily fiberglass insulation stopsthe flow of air circulating in the wall. Clothing does the same.In a still room there is a convection flow of air raising fromour bodies. If the body gets cold exposed hair stands up in anattempt to stop air flow. A divers wet suit stops the flowof water next to the body and a dry suit insulates better with alayer of air in dry clothing.<br><br>A clean, dry camera bag that zips shut (make sure itsreally dry) will stop the transfer of moist air in and dry airout. If you put a lens way with condensation, rain or snow on itthe bag might start dry but it will be wet. I once put a lensaway with just enough moisture from a very light sprinkle thatcondensation occurred between the filter and lens. The moisturemust have been in the threads of the filter as I wiped down thelens before putting it away for the night. This was on a backpacking trip in the Eastern Sierra Nevada range of CentralCalifornia. I air-dried several lenses and my cameras the nextmorning, no harm, no foul. Use common sense, stop the flow of airsafely.<br><br>The best thing is to plan ahead and have Zip Lock or Heft One Zipbags. Freezer bags with the zipper thing are really nice. Plasticdoesnt necessarily stop the convection flow but if airtightor nearly so it denies a fresh supply of moist air. If a plasticbag has most of the air squeezed out the bag may sweat but onlyon the outside.<br><br>---<br><br>On a similar topic if you have refrigerator cold film and want towarm it faster put it in your pocket while still in the air tightpacking. It will take a long time at near body temperature to doany damage. Here the air tight packing denies a fresh supply ofmoist air. Even if there is sweat in your cloths the packinglocks it out.<br><br>Regards,<br><br>Dave Hartman. Link to comment Share on other sites More sharing options...
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