SVBONY SV172 Lens Heater Warmer Dew, 240mm 3 Gear Regulator Temperature USB Universal Dew Heater Strip for Telescope Camera

Good quality works well

I used this product to warm up the sides of an acrylic fish tank to stop condensation from forming and leading to mold. It worked great with the included temperature regulator, but the regulator automatically shuts it off after a certain period of time. I wanted it on constantly, so I plugged it in directly without the regulator. I got a little bit of deformed plastic on the fish tank after leaving it running it constantly for about 3 days. So, I guess I should have kept using the regulator! I'm leaving 5 stars because the quality was very solid and it looks like it would work great for its intended use on cameras. I also loved the velcro system, I was able to attach the lens warmer to something bigger than intended simply by buying a normal strip of velcro. I also liked that the regulator was a separate piece, gives more flexibility for use.

I needed an eyepiece heater to combat the inevitable breathing induced fog that cursed my infrequent viewing nights...I am primarily a visual observer, and I have a few 2" eyepieces that plop into my dob for orgasmic stellar and planetary observations. Recently with the conjunction of Saturn and Jupiter, my target was way low on my horizon and was only getting worse as the days ticked off to the 21st...was out with my wife in early December and we kept breathing on the eyepiece and it was super frustrating, so I researched and bought this thingy. It works well and plugs right into my USB powerpack that I've had for years. This one worked, while another type of heater meant for a more expensive battery setup did not work with my powerpack and an adaptor cord to USB (returning the other one, cause it was just an experiment to see if it would work and it did not warm appreciably). I don't need a dew-not or dewzapper system, when I have something that works very well with my USB pack...you mileage may vary, especially if you intend to use a 12v power supply for other things and justify a $150 power distro system.

It is a good product and it really works. The power consumption is between 21.5 and 2.5A @12V depending on control's power settings so you need a suitable power supply. I will buy another one for the finder.

I woke up at 4am the other morning to view Saturn high in the sky with excellent seeing. I got an awesome view (the seeing conditions were perfect as in the air was perfectly still), but my eyepiece fogged up. I got this heater, and a few days later I got up at 4am again to look at Saturn again. This time the seeing was good but not perfect, but the heater did its job and the eyepiece didn't fog up.

Nice kit includes a handy knit storage bag. The 3 level controller can be removed to plug the heater into the USB directly. The 400mm fits my 102mm SvBony perfectly on either the Dew shield or Main tube. Velcro closure is adequate to keep it on, and the overall quality is good. I have used these bands successfully below 20F. Remember 2 amps at 5 volts is only 10 watts at most, and depending on your scope, dew point, etc. results may vary.

Does the job on my SVBONY SV503 102ED. The 3 level adjustment is nice for different conditions.

I was very happy when I saw these. I'm a big user of USB 5v power for accessories on my telescopes. SVBONY has been improving a lot and these dew heaters looked to be a great addition to their line. Unlike most of the "blast furnaces" on the market, these don't get as hot which mean less chance of tube currents. Unfortunately, they have a lot of problems. From the start, they were very picky about the power supply. Using a USB power supply designed for computers and recharging, some of the controllers would turn off after a few seconds. I then tried them in a USB power strip running off of a 12v power supply and they seemed to have no problems. Since this is my scope power, I was happy. Within several weeks, the controllers stopped working. They would just show the ambient temp and not heat. Removing them, the dew strips would heat without getting "hot". That stopped a few weeks later. I bought three of these and use two on the mirror end of my 8" reflector. They were not 'kinked' or mistreated in any way. It's a shame they were a flop. SVBONY contacted me and after a few emails we got things ironed out. I made some suggestions to help improve both their product and the site description for the heaters. I hope that they take this to heart and come out with an improved product.

Well made, works without fail and recommended for value versus the big name brands...

Worked perfect for my 180 mak... stupid "light" you mean water bucket. 😆

Good job 👏

I’ve been using SVbony products since my SVbont telescope purchase, and this one matches/looks/works great on my SV550 scope

Purchased this for my 80ED. Works perfectly fine, another quality product from SVBony. I have yet to be disappointed by these guys.