Reddit reviews PROTAGE Condensation Prevention Lens Heater Evening Dew Remover USB Warmer P-LH02
We found 7 Reddit comments about PROTAGE Condensation Prevention Lens Heater Evening Dew Remover USB Warmer P-LH02. Here are the top ones, ranked by their Reddit score.
It prevents condensation by warming up the lens on a camera or telescope.Proven effectiveness against condensation, outside in a field, at a temperature of 5 F.[Unit dimensions] 1.2inx0.2inx17.3in (widthxthicknessxlength) USB cable length: 56.7in [Unit weight] about 2.1 oz[Power source] USB [Power consumption] about 5V 1A 5W [Operating time] about 6-10 hours
Hmm in looking into this, it seems that there are USB powered lens warmers on amazon.
A number of them seem to heat to 122f (50C) thus I would recommend getting some perfboard and building up a simple voltage control circuit in order to probably drop the voltage to like 3.5V, or search ebay for a USB fan speed controller (they sell for less than $1.50). Then adjust the voltage until the lens heater can maintain a temperature of probably 80-90f.
https://www.amazon.com/PROTAGE-Condensation-Prevention-Evening-Remover/dp/B073X18JND/ref=sr_1_1?s=electronics&ie=UTF8&qid=1535953885&sr=1-1&keywords=lens+warmer
or this
https://www.amazon.com/COOWOO-Upgraded-Warmer-Universal-Telescopes/dp/B075ZSYJ31/ref=olp_product_details?_encoding=UTF8&me=
Since they are designed for colder temperatures, pairing one of those with a USB fan speed controller, e.g., https://www.ebay.com/itm/USB-Fan-Speed-Controller-DC-4-12V-Reducing-Noise-Multi-stall-Adjustment-Governor/123314897776?hash=item1cb6240370:g:7swAAOSwtE9bdW41
May allow you to achieve just enough warming to counter the AC in the car and not overheat the lens.
Then just have the wrap loosely on the lens or under the camera, and lens,with just enough power to keep it close to the outdoor temperature.
Use a battery powered wrap-around dew heater: https://www.amazon.com/PROTAGE-Condensation-Prevention-Evening-Remover/dp/B073X18JND/ref=mp_s_a_1_6?keywords=telescope+heater&qid=1555265847&s=gateway&sr=8-6
Sure, here’s the one I got.
PROTAGE Condensation Prevention Lens Heater Evening dew Remover USB Warmer P-LH02 https://www.amazon.com/dp/B073X18JND/ref=cm_sw_r_cp_api_6UdQBbR4X3V1Z
I think using a lens warmer is typically considered the best option!
Not sure about a telescope tracking electronics but my Camera does fine when this happens. It’s a common problem when photographing Aurora here in Alaska. To keep the lens clear they make [usb lens heaters ](PROTAGE Condensation Prevention Lens Heater Evening Dew Remover USB Warmer P-LH02 https://www.amazon.com/dp/B073X18JND/ref=cm_sw_r_cp_api_i_hmxZDb9YG664K). Might work on the main mirror but not sure how you would keep the others ice free. My camera does fine to about -30°F then starts acting up.
I went to a talk by a prominant local landscape photographer - He swore by these heated sleeve for his lenses to prevent it from fogging (and believed they would clear fog fairly quickly - so he didn't have to worry about temperature in his car etc - or waiting for the temperature to equalize)
something like this
he swore by it (and I know a few people who went to the talk did buy some afterwards and have had similar success)
does require a portable battery however - which can be annoying if you need the camera to be more movable; but if you were say setting up tripods etc, its not tooo bad.
Theres also a lens-warmer that you can attach through the usb port in your camera. Heres one on amazon for about $20
PROTAGE Condensation Prevention Lens Heater Evening dew Remover USB Warmer P-LH02 https://www.amazon.com/dp/B073X18JND/ref=cm_sw_r_cp_apa_3otJBbFSTKFT2