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Heating strips - keeping your view of the night sky clear
Nights are not always as dry and clear as you would like. Optical surfaces will often fog up at night. And once your optics have fogged up, then your observing is over for the night. This can be avoided. Tydeux heating strips keep off the dew and help you super clear observing - all night long.
Why do your optics fog-up? A fine mist of water droplets forms on the spectacles as the warm air condenses onto the cold glass surfaces. Exactly the same happens on the lenses of your telescope optics. As your optics cool down, water condenses onto the surface. Then it's time to free your view!
Simply connect to a suitable power source using the lead with DC plug supplied. Heating strip effectively keeps the temperature just a few degrees above the ambient temperature, just enough to ensure that dew no longer has a chance to form. It also uses minimal energy, hence sparing your battery.
Highly practical! At the beginning of your observing session, simply wrap the heating strip around the OTA or your eyepiece. The strip fits like a glove and can be fixed in place using the adhesive strap fastener. After you are finished observing, just stow it back in the eyepiece case.
Tydeux strip heaters provide you with longer observing sessions. And, when other stargazers are giving up and packing up their telescopes, you can continue observing for just as long as you want!
Kmplawesq
2025-08-05 18:24:46
If you live in, or vacationing/visiting, a hot, humid, environment the USB Lens Warmer is a marvelous addition to your camera bag. Going outside from a comfortably cold and dehumidified area (in my case a 73 degree home with air conditioning) into the hot (90 degree plus) and humid Florida air causes glasses to get all fogged up - the same is true for you camera lenses.How do you prevent the glass from becoming steamed up and opaque due to that mist on the lens? You surely don't want to wipe your very expensive camera lens with your shirt or a paper towel. A microfiber cloth does better but is not great. Instead of those I've quickly come to rely on these lens warmers which will heat up the lens enough so that the mist will not form on, or will be quickly dried off, the lens.The other day I saw a bunch of children playing on the dock across from my home and I wanted to get a picture of them and their cute antics. I grabbed my lens and wrapped it in the lens warmer and very quickly I was able to go outside and take the pictures I wanted without having to wait a long time until the lens warmed up by the ambient air or without having to try to wipe the lens dry without streaking.The Tydeux USB Lens Warmer does an admirable job of heating your lens to your desired temperature so that the fog does not form on the lens or will be quickly "burned off." This lens warmer wraps around your lens and is held in place by a velcro like fastener strip. It can be plugged directly into either a wall charger or a portable power bank and the degree of warmth governed by an integrated stepless heat regulator. That way your lens can be heated to a 'fog free" temperature before you take it outside or, if you are already outside, you can heat the lens up using your power bank and quickly make the lens "fog free."The Tydeux USB Lens Warmer is a marvelous device to prevent, or remove, dewy fog on your lens making you just that much more ready to take the pictures you want. It does its job quickly and easily and I think this is something that should be in every camera bag. I give this device a 4 plus star rating and hope that anyone considering buying a lens heater consider this one as a potential purchase.
Dave Allmon
2025-08-02 12:39:02
Cheaply made, but it holds up. The 400mm one draws less current, and dosen't get as hot as, the 250mm version. I wound up replacing the controller, because it was flakey. The current would sneak up to around 900mA, then drop to zero. Rinse and repeat. The new LED controller looks exactly like the original, but is rock steady. The controllers are $12.xx per pair here on Amazon.
Brian
2025-05-25 19:39:00
I was a little surprised when I took this dew heater out of the box and fitted it on my classic orange-tube Celestron C90 scope. Sure enough, there is plenty of band to go around the 90mm diameter tube (as advertised), but the heater strip only goes around maybe 2/3 of the circumference. The rest of the distance is taken up by just the elastic strap.I don't know yet if this disappoints me, because it's just now starting to get colder at night to where dew can be a problem. I'm going to try this out in different positions on the scope tube and see if it's able to keep the entire objective free of dew and fogging even though it's not being heated all the way around.Otherwise, construction is OK. I'm not in love with the elastic part of the strap. It's weakly stretchy in the way that fabric elastic bands are when the sun makes them dry up and lose their stretch. The velcro does work pretty well. The USB cord isn't tremendously long, but adding the inline rheostat helps increase the reach. Mine seems to work just fine here on my desk, getting mildly warm when plugged into a 2-amp USB power jack.For now, I'm giving four stars. if it can't keep my entire objective free of fogging, then I'm going to revise that downwards after a couple tests.
M. L.
2025-03-15 17:06:32
12V powered dew heater heats up quick. Unlike USB dew heater, it should warm up better.The dew heater is long enought to cover my 128mm refrector telescope and has two on/off switch. One on the heater side, and one on the 12V plug in side. One that close to heater is just on/off, and the one that closed to 12V plug (to power) is on/off with temp. control. I can just setup right temp. and use other switch to turn on/off. Plug nicely to 12V out on my AC/DC battery pack.Due to the shipping, it came folded with creases, but hopefully from normal use, it'll be flattened.Appears to be havy duty material and well made.It may not compatible to some dew heater controllers which use RCA jack, but works for me since it has common 12V plug for power and has built in temp. controller.Good vlaue.
DF
2025-02-10 13:02:23
So, be aware that "Less Than 3.15 inch (80mm) in Diameter" in the description means the OUTSIDE diameter of whatever you are using this on. I had already planned to use this on a 50mm guidescope or finderscope - which is good, because my photo with the white telescope is a 72mm diameter lens. And there's a good 1.5" or so that is not covered by a heating element. And the "25cm" is a bit generous - it is definitely closer to 23 cm, or 9 inches.The dew strip does get warm quickly - I could feel the heat in about 2 minutes when I plugged it in and turned it up to full. I was able to get at least four different changes in the wattage pulling from my power pack, and that may be a function of the fact that it is not terribly sensitive to small changes. Or, it's possible that the internal "dial" of this heater really only has four settings. I am not sure. But it should have a least four, which is useful in any case.The Velcro seems fine. I am not crazy about the somewhat small wire, but it's not moving a lot of electrons so it should be fine. I will likely want to tape the connection between the variable dial and the strap.So far it seems good. I'll update if I find anything further.
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