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 Lens fogging up 
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Joined: Sat Dec 12, 2009 10:51 pm
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Location: Hobart, Tasmania
Post Lens fogging up
Hi

Just wondering what others are doing about fog forming on the lens during cold night timelapes?

I have been running into this problem every time I am out in the field summer or winter (Tasmania). I have been trying to wipe the lens between frames but the moisture just beads and make it worse. I have also had the fogged glass freeze over in a thick white film, when scraped off it forms again in minutes.

Im sure im not the first person to run into this problem, help!!

Luuk


Wed Apr 27, 2011 6:38 am
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Joined: Wed Mar 16, 2011 2:58 pm
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Location: Denver, Colorado
Post Re: Lens fogging up
are you using a filter?

http://www.amazon.com/Nikon-8073-Fog-El ... B0007M6GJ0


ive heared good things about this stuff.

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Wed Apr 27, 2011 8:41 am
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Joined: Fri Dec 04, 2009 3:31 pm
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Post Re: Lens fogging up
Quote:
http://www.amazon.com/Nikon-8073-Fog-El ... B0007M6GJ0


ive heared good things about this stuff.


That looks interesting

Pocket hand warmers strapped to the lens will work too.


Wed Apr 27, 2011 8:59 am
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Joined: Fri Apr 03, 2009 6:15 pm
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Location: Middle Earth
Post Re: Lens fogging up
Prevention is better than cure so try a "Dew Heater" and a wooly sock with the bottom cut off. :-)

http://cgi.ebay.com/Dew-Not-Dew-Heater- ... 5293wt_905

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Wed Apr 27, 2011 1:48 pm
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Location: Antarctica/California/New Zealand
Post Re: Lens fogging up
Or if you have mains power available, use a small blower heater or a hair dryer pointed at the lens from a safe distance.

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Wed Apr 27, 2011 2:27 pm
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Joined: Fri Oct 21, 2011 6:01 pm
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Location: Sale, Vic, Aus.
Post Re: Lens fogging up
Luuk, how did you go with this? Im having the same problem.


Sun Nov 27, 2011 2:44 pm
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Location: Antarctica/California/New Zealand
Post Re: Lens fogging up
Overall dew heaters are the best answer I've found for general use.
Hand warmers are another viable alternative, but not for an all-night shoot, and you need to be aware that handwarmers give off a lot of moisture which can cause other problems in certain circumstances.
If you have mains power though, and aren't worried about the noise, you can't beat a heat gun or hair dryer at a safe distance clamped in place.

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Sun Nov 27, 2011 3:16 pm
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Joined: Sun Feb 05, 2012 6:46 am
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Location: Salzburg, Austria
Post Re: Lens fogging up
This seems to be the right place to ask for fog issues...
So last night I shot this time lapse and had an obvious problem with the look of the moon, starting around 0:09. I didn't look at the lens when I was shooting. Does this look like a lens fogging up to you guys? I am asking because it was around 0°C at 1.000m altitude, very dry and I had a light breeze. So I would never have expected fog on the lens under those conditions. I used a Sigma 12-24mm on a Canon 5D Mk2.


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Fri Mar 02, 2012 5:53 am
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Joined: Fri Aug 19, 2011 6:50 pm
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Post Re: Lens fogging up
Doesn't look anything like fog/dew to me...looks more like a "perfect" alignment of the moon, your lens elements and your sensor causing a brief overload of the sensor.

...Ric

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Thu Mar 08, 2012 3:44 pm
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Post Re: Lens fogging up
Hmmm... I didn't even know that can happen. Do you know any way to prevent that or work around it?

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Thu Mar 08, 2012 3:47 pm
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Post Re: Lens fogging up
If I'm correct in my guess then it's just a matter of making sure your camera isn't aligned at that "perfect" right angle to the moons path...

notice how it only happens while the moon is within a small arc of movement? when it's slightly off-angle (up/down/side to side) you're not getting that extreme flare. Just keep light sources like the moon (and especially the sun) off angle side to side or high enough in the frame so it won't have the chance to align like that again.

HTH...Ric

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Thu Mar 08, 2012 4:50 pm
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Post Re: Lens fogging up
Thanks Ric!
I'm selling my Sigma 12-24mm anyways so hopefully I won't run into this problem again. Except of course it's a phenomenon that can occur with every lens. Just out of interest I might try to reproduce the flare to see if that was really it.

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Thu Mar 08, 2012 10:13 pm
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Joined: Mon Jan 02, 2012 5:42 pm
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Post Re: Lens fogging up
So back to dew heaters... is there a battery-powered option? Most I'm finding online require a plug (ac/dc) can't I just drop a couple of 'C' batteries in something to keep the lens warm?


Wed Mar 21, 2012 1:24 pm
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Post Re: Lens fogging up
These dew heaters work on 12 volts.

http://www.amazon.com/Dew-Not-Heater-St ... B003V38XBQ

http://www.ebay.com/itm/Kendrick-Hand-C ... 415wt_1132


Thu Mar 22, 2012 6:57 am
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Post Re: Lens fogging up
I think I'm dumber than I want to admit, but don't those still require some type of controller unit? Is there nothing that just provides a constant heat source? I just need something simple for my wide angle lens. Perhaps hand warmers are just the best option for me.


Sun Mar 25, 2012 4:28 am
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Post Re: Lens fogging up
I read that sole heaters are supposed to work pretty well. I just ordered them and will post if they work well for me. I should add though that I haven't had any problems with my lens fogging up yet. I used hand warmers so far and they worked fine.

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Sun Mar 25, 2012 9:21 am
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Post Re: Lens fogging up
wee_ag wrote:
I think I'm dumber than I want to admit, but don't those still require some type of controller unit? Is there nothing that just provides a constant heat source? I just need something simple for my wide angle lens. Perhaps hand warmers are just the best option for me.


The one I use I plug directly into a 12v battery. It pulls about 0.5amps with no power regulation, so enough to last all night on a 7.2AH gel cell, and puts out probably about the same heat as 3 hand warmers.
The other thing is, my spare motor controllers can also act as power regulators (I wired them all up with the same plugs). They can control the power brilliantly on both motors and heaters for dirt cheap.
http://www.ebay.com/itm/DC-12V-24V-3A-M ... 35b4cad813

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Sun Mar 25, 2012 9:22 pm
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Joined: Thu Mar 22, 2012 12:10 pm
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Post Re: Lens fogging up
I agree with Ant on this the best method for keeping dew off your lens is an astronomical dew heater. They can be run directly from 12v without a controller, but will be running at full power, which will quite often be too much. the key is to get the lens optics to just a couple degrees Celsius above dew point, too much heat can cause a slightly soft image due to thermal convection currents. with a wide angle lens it may not be an issue, but too much heat on a telescope and you definitely notice the difference!

a small 12v battery should give you a nights worth of power if used with a heater strip and controller when set to the correct power.

i have used a similar battery to this in the past:
http://www.ebay.co.uk/itm/Mini-DC-12V-1 ... 3a727c2885


Fri Jun 15, 2012 8:44 am
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Joined: Tue Feb 11, 2014 1:55 pm
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Post Re: Lens fogging up
Does anyone used this solution?
www.kadamsphoto.com/catalog/digital-aft ... -p-85.html


Tue Feb 11, 2014 2:02 pm
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