Olympus UK E-System User Group

Olympus UK E-System User Group (https://e-group.uk.net/forum/index.php)
-   Accessory talk (https://e-group.uk.net/forum/forumdisplay.php?f=16)
-   -   HELP! Dew heater advice (https://e-group.uk.net/forum/showthread.php?t=47030)

raichea 20th January 2018 12:36 PM

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

raichea 21st January 2018 11:06 AM

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?

sapper 21st January 2018 11:50 AM

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.

raichea 21st January 2018 11:57 AM

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

sapper 21st January 2018 12:01 PM

Re: Dew heater advice
 
Quote:

Originally Posted by raichea (Post 437927)
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.

Jim Ford 21st January 2018 12:21 PM

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

raichea 21st January 2018 12:50 PM

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

Invicta 21st January 2018 01:25 PM

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.

wornish 21st January 2018 02:06 PM

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

Wally 21st January 2018 02:42 PM

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. *yes

raichea 21st January 2018 02:59 PM

Re: Dew heater advice
 
Quote:

Originally Posted by wornish (Post 437952)
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

raichea 21st January 2018 03:01 PM

Re: Dew heater advice
 
Quote:

Originally Posted by Wally (Post 437962)
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. *yes

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.

MJ224 21st January 2018 04:47 PM

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......

birdboy 21st January 2018 05:05 PM

Re: Dew heater advice
 
Quote:

Originally Posted by raichea (Post 437871)
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.

raichea 24th January 2018 05:58 PM

Re: Dew heater advice
 
Thanks everyone. I'm going to give one of the cheaper units a try for now.


All times are GMT. The time now is 10:57 AM.


The Write Technology Ltd, 2007-2019, All rights reservedAd Management plugin by RedTyger