Haida HD4635 Lens Heater/Warmer/Anti-Fog Belt

The Haida Anti-fog Belt is a cheap and simple solution to prevent condensation forming on your lens. The Haida Anti-Fog Belt is made of high quality materials, the belt attaches using a simple hook and loop system, so it can be adjusted to the diameter of any lens (As long as the diameter doesn’t exceed 110mm). Haida Anti-Fog Belt is compact and lightweight, making it perfect for hiking and travelling with. The Haida Anti-fog Belt has a graphene element which heats up when connected to an external power source (Power Bank). There are 3 different temperature settings, these are Low (35-45°C), Medium (45-55°C), and High (55-65°C).

I’ve used the Haida Anti-Fog Belt several times and it has always worked flawlessly. The ultimate test was when I spent several hours capturing the Perseids meteor shower in August in the Dolomites. It was near freezing and I had two cameras set up, but unfortunately I only had one Haida Anti fog belt. My Nikon Z7II with 14-24mm Lens and the Haida Anti Fog Belt performed perfectly without ever fogging up, but my second camera (Nikon Z6II with 24-70mm Lens) fogged up within the first 30 minutes.The Haida Anti-Fog Belt is incredibly easy to install, it fits on any lens with a diameter of less than 110mm. The cable which includes the controller is 150cm long, this makes it long enough to leave the powerbank in a camera bag or on the ground between the tripod legs. I generally prefer to attach the powerbank and wire to the leg of my tripod to ensure the cable doesn’t flutter in the wind and cause vibrations.

As with any dew heater, it’s important to ensure that you do not accidentally knock the focus ring when attaching it to the lens. If your lens allows you to lock the focus ring, then I would suggest doing this once you have focused (And before attaching the dew heater). If your lens does not have a focus lock, then I would suggest using some electrical tape to lock the focus ring to the lens barrel (Before attaching the dew heater). 

The controller has a single button which activates the Haida anti-fog belt. The default setting is high, and you can cycle through the different settings (Low, Medium, High) by pressing the button on the controller. 
he controller has an LED light which shows when the device is on and which power setting it is set to. This is surprisingly bright, but it's easy to cover with the original pouch or a small piece of electrical tape. 

As with all other electronic dew heaters, the Haida Anti-Fog Belt needs an external power source in order for it to work. I use my Anker PowerCore 26800, this is a massive power bank and will easily last for a whole night of shooting.

Cons:

·The band is quite narrow (A thicker band would warm up more of the lens)

·The LED indicator on the control unit is too bright

Note:The things I have mentioned above as cons are only minor issues, and aren’t a deal breaker. If you enjoy spending nights out capturing the wonders of the night sky, then I would definitely recommend the Haida Anti-Fog Belt, as it does a great job of keeping condensation away!

Conclusion

There is not much more I can say. The Haida Anti-Fog Belt does exactly what it should, it keeps the lens slightly warmer than the ambient temperature to prevent condensation building up on the front element of the lens. 

The Haida Anti-Fog Belt is something every astrophotographer and time-lapser should have in their kit. You won’t need it all the time, but its compact and light enough to always have in your camera bag whenever you plan to shoot night sky photography or in very humid climates.