Preventing fog on lens at

Go Back   DV Info Net > Special Interest Areas > Under Water, Over Land

Under Water, Over Land
Tools & Techniques for Nature, Outdoors, Wildlife & Underwater Videography.

Thread Tools Search this Thread
Old April 20th, 2006, 10:39 PM   #1
Regular Crew
Join Date: Sep 2002
Location: Singapore
Posts: 30
Preventing fog on lens

Just came back from an island called Pulau Ubin in Singapore where it is reputely the best place for stargazing.
Tried to get a timelapse of the stars but the lens kept getting fogged up througout the night.
Anyone encountered or have any solutions? I'm thinking of taping a heat pack onto the camera.
Yean Tan is offline   Reply With Quote
Old June 27th, 2006, 07:17 PM   #2
New Boot
Join Date: May 2006
Location: Tampa, FL
Posts: 12
Various riflescope "safe" defoggers should work

EK Scope Dope USD $3.99 Used for hunting rifle scopes.
Cabelas has a good reputation in USA and this item is very light, so won't cost very much to ship, even to Asia.

They have other items too...
Jim Harring is offline   Reply With Quote
Old June 28th, 2006, 07:35 AM   #3
Major Player
Join Date: Jun 2005
Location: West Point, MS
Posts: 313
did you allow your camera time to get to outside temperature or take it from a cool place to hot and start videoing or hot to cold too quickly. If so set your camera in the temperature you will be videoing in for at least 30 minutes to allow the camera to get accustomed to the temp difference.
John M. McCloskey is offline   Reply With Quote
Old June 28th, 2006, 06:11 PM   #4
Join Date: Nov 2005
Location: Honolulu, HI
Posts: 1,961
I don't think it is a matter of letting the camera acclimate. The changing conditions during the night will cause dew and a camera lens pointing up will catch that dew. A can of compressed "air" may help dry the lens, but a hair dryer or heat pack might be better. I think a gentle blast from the hair dryer every once in a while might be easiest to implement. The compressed "air" cans may cool the lens which could make the problem worse. Don't use a fueled heat source since their exhaust contains a lot of water which may initially condense on the lens. Obviously, don't apply significant heat as it may adversly effect the camera.
Marcus Marchesseault is offline   Reply With Quote
Old June 28th, 2006, 10:11 PM   #5
Regular Crew
Join Date: Jan 2006
Posts: 121
Marcus has it right....except I wouldn't use a can of air. Too often something nasty comes out that you don't want on your lens. I am an amateur astrophotographer(in addition to playing at video during the day). The problem is indeed dew....formed by the lens being at a different temp than the air. When I am in my observatory I can use a hair dryer as Marcus suggested if it is really heavy dew. When out in the boonies(we sometimes pick up and go to darker skies) I use a "heat rope" attached to a battery. You can get this "heat rope" at American Science and Surplus. I believe they are on the web. They have a store in Wisconsin. It's basically nichrome wire in a cloth sleeve. You wrap it around the end of your lens. The DC current heats it just enough so it warms the lens. You don't need much heat...just a degree or two above ambient is enough. It's best to turn it on at the start and leave it on. Once dew forms it takes forever to get rid of it with the heat rope. Another option is to take a look at Kendrick Dew Heaters. They make a very nice system for telescopes that are easilly adapted to any size lens. It's what I use on my 12 inch scope in the observatory when the dew isn't heavy. Works a charm.
Mark Slade is offline   Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

Omega Broadcast
(512) 251-7778
Austin, TX

(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

(800) 238-8480
Glendale, CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Special Interest Areas > Under Water, Over Land

Thread Tools Search this Thread
Search this Thread:

Advanced Search



All times are GMT -6. The time now is 05:18 PM.

DV Info Net -- Real Names, Real People, Real Info!
1998-2015 The Digital Video Information Network