robgr85's blog

DIY - lens warming device

posted by robgr85, Aug 16, 2007 9:41 PM — 8 comments


After trying to take photos of 'perseid showers' i got a lot problems with dew gathering on my camera lens. It is extremally easy to fight with it using my new DIY weapon. Lens warmer! Extremally helpful while shooting at night, especially long exposure nightscapes.

Things You will need:

- rubber material
- zip
- cutting device
- 2 ohm 5 watt resistors (12 pieces)
- power plug
- power cable
- short wires
- silicon glue

The device connected to the 12V car installation will give 6Watts of energy to Your lens.

You can also use other power supply to the device, the higher voltage, the more power it will produce. I think it is good idea to install extra switch to control the warmth of Your lens depending teperature of the air...

Take a look how to create lens-heater?:

Watch it!

If You have any questions post them under metacafe video (or here). If You like it, put apropriate rating to my video.


Comments | RSS

1. posted by imecenas, Jul 20, 2012 6:40 PM

The tip is very helpful for me!

2. posted by lmgk, Aug 25, 2007 12:46 AM

Excellent tip!

Probably work for telescopes too! Cheers

3. posted by Idac, Oct 25, 2007 3:18 PM

Very handy for camera lenses.
As far as telescope (reflectors) are concerned, I'm afraid this wouldn't work.

It works with camera lenses (though likely not with very big long focal schmidt/cassegrain tele lenses) because the lens is a relatively small encased space.
Telescopes represent a much bigger internal volume in comparison, resulting in convection turbulence. This added to a relatively long focal length (usually more than 1000 mm) is giving far too much image distorsion.

Common practice is to let the mirror cool down and adjust to external temperature before starting any observation.

4. posted by carlos24, May 10, 2008 11:48 PM


5. posted by digijoe, Jul 18, 2008 5:52 AM

i'm sorry, but i dont understand what is it for? i'm complete ignorant about this subject... if you coud explain it to me...

6. posted by dlritter, Jul 18, 2008 2:22 PM

When taking photos at night your lens can cool to a temperature below the air's dew point. This causes the water vapor in the air to condense on the front of your lens (this is how dew works). This dew will distort your photos.

This device will slightly warm your lens to keep this from happening.

7. posted by giftlove4u, Jan 31, 2012 6:25 PM

Helló Kedves

engem érdekel ha
A nevem Ajándék vagyok, szép, fiatal lány, tele szeretettel
Nos, láttam a profilodat ma
ami nekem öröm, hogy Önt
Kérjük i tetszeni fog kapcsolatba lépni velem az én e-mail
Ugyanakkor meg fogom mutatni neked a képet, és küldd el kép
kisasszony Ajándék

küldj egy e-mail

8. posted by Recliners, Jun 21, 2013 4:16 PM

Very nice - thanks for showing us!

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