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Accessory talk Those important extra system components.

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Old 20th January 2018
raichea raichea is offline
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Dew heater advice

Has anyone used a dew heater with the 7-14mm Pro lens (and possibly others)? I'm thinking of doing more night-time photography and think I may need one.

Any recommendations, pit-falls?

TIA, Steve
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Old 21st January 2018
raichea raichea is offline
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Re: Dew heater advice

Hmmm... quite a few views but no replies.

Does that suggest a dew heater is not really necessary? Has anyone here had problems with condensation that a dew heater is meant to resolve?
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Old 21st January 2018
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Re: Dew heater advice

What is a dew heater? Maybe that is why there are no replies, cos we don't know what it is.
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Old 21st January 2018
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Re: Dew heater advice

Oops! Good point - I shouldn't have assumed... it's a low-power heater to keep the lens clear of condensation on cold nights. Here's an example:

https://www.amazon.co.uk/Upgraded-De...f=pd_sim_421_1
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Old 21st January 2018
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Re: Dew heater advice

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Originally Posted by raichea View Post
Oops! Good point - I shouldn't have assumed... it's a low-power heater to keep the lens clear of condensation on cold nights. Here's an example:

https://www.amazon.co.uk/Upgraded-De...f=pd_sim_421_1
Oh, never seen these before. But do lenses get condensation on them when out in the cold? I have never had that happen. Coming into the warm from the cold, yes.
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Old 21st January 2018
Jim Ford Jim Ford is offline
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Re: Dew heater advice

I guess that if you're out at night for a long time in the cold, and a warm front comes, then you'll get dew and condensation.

The only time I've needed something like that is at Kew Gardens when going into the hot houses during winter. I need one for my glasses then as well!

Jim
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Old 21st January 2018
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Re: Dew heater advice

I went to a talk by Dr Lilian Hobbs (http://www.lilianhobbs.com/)... she mentioned them as being useful.
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Old 21st January 2018
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Re: Dew heater advice

If you doing long exposures e.g. astrophotography or time-lapse at night (or any time when air temp drops below its dew point) then yes a dew heater is useful.

A lens is subject to local radiative cooling so a dew heater stops this.
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Re: Dew heater advice

I use one on my telescope for astrophotography. They certainly do work but take quite a bit of battery power. They come in all lengths for different lens diameters. Almost all work on 12V DC.

Most astro sites sell them. I got mine here.

https://www.firstlightoptics.com/dew...ter-tapes.html
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Old 21st January 2018
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Re: Dew heater advice

I've never heard of this before reading about it here. I would imagine - hope - that this item might also work in areas of high humidity? As Jim has mentioned, when in Singapore and Malaya, I was always wiping either the lens on the camera or my glasses. At times, wiping clean one would allow the other to steam up.
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Old 21st January 2018
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Re: Dew heater advice

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Originally Posted by wornish View Post
Almost all work on 12V DC.
The one I mentioned and quite a few on eBay seem to work off a 5V USB powerbank, which would be very convenient.

Thanks to all for the other comments
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Old 21st January 2018
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Re: Dew heater advice

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Originally Posted by Wally View Post
I've never heard of this before reading about it here. I would imagine - hope - that this item might also work in areas of high humidity? As Jim has mentioned, when in Singapore and Malaya, I was always wiping either the lens on the camera or my glasses. At times, wiping clean one would allow the other to steam up.
I would hope so but not sure.... probably depends on the humidity level, though. They're quite low power - typically 4 or 5W for those suitable for camera lenses.
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Re: Dew heater advice

Leave your lens out long enough at night, you will see condensation on the front glass.............

Overnight Astro needs these, or you can cover the lens when not in use........

Never bothered myself, as I don't spend that much time out there with a camera and lens, usually a camera and Newtonian Scope, which has no front lens......
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Old 21st January 2018
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Re: Dew heater advice

Quote:
Originally Posted by raichea View Post
Has anyone used a dew heater with the 7-14mm Pro lens (and possibly others)? I'm thinking of doing more night-time photography and think I may need one.

Any recommendations, pit-falls?

TIA, Steve
Just seen this but do not have the 7-14mmpro
I use dew heaters on the 300mm f4 and 40-150f2.8 for astrophotogrphy they are a must have in the uk in winter IMHO. Once a lens forms dew that's it for the night.

There are many brands on the market be careful of the cheaper ones the leads can easily pull out of the tape part. That has happened to me.
I quite like those tape heaters from Dew Control as the lead come out of the side of the tape not tried them but have handle them at an astro show. When mine give up that's what I intend to replace them with.

https://www.dewcontrol.com/

I should add that you will need a 12vdc power source as well I use the Skywatcher PowerTank 17Ah

You could try hand warmers wrapped in duct tape they are a one off use but at about 1 a shot/night could work. Some examples on internet.
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Old 24th January 2018
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Re: Dew heater advice

Thanks everyone. I'm going to give one of the cheaper units a try for now.
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