Lynx Astro 20cm Dew Heater Strap for Large 2'' Eyepieces or Finders
Lynx Astro 20cm Dew Heater Strap for Large 2'' Eyepieces or FindersLynx Astro 20cm Dew Heater Strap for Large 2'' Eyepieces or FindersLynx Astro 20cm Dew Heater Strap for Large 2'' Eyepieces or FindersLynx Astro 20cm Dew Heater Strap for Large 2'' Eyepieces or Finders

Lynx Astro 20cm Dew Heater Strap for Large 2'' Eyepieces or Finders

  (9 Reviews)
✓ 2 year warranty


73x in stock shipped 1-2 working days

About this product

Model:  lynxastro_dew_strap_20cm
Part Number:  lynxastro_dew_strap_20cm

Lynx Astro premium quality dew heater straps, made in the UK. 

Robust design using modern materials for high performance and long life!

Simply wrap one around the telescope tube near the optics and secure it there with its integrated Velcro/elastic strap. A gentle heat is then transferred to the optics until the temperature is slightly warmer than the dew point. 

This heater strap is 20cm long, please check the circumference of your eyepiece or finderscope first to ensure this will provide a good fit. 

Will I need a Dew Controller? 

A simple 12V Dew Heater Supply Cable can be used to connect the tape to a suitable 12V power-supply. When connected this way, the tape is essentially running on full power. This won't harm the tape, but with smaller telescope apertures, it might result in the optic being warmer than necessary, which can affect the view and waste energy. The solution then is to use a Dew Controller that regulates the heat (also enables you to use more than one heater tape). 


  • Suitable for use with larger 2" eyepieces or finderscopes (20cm long). 
  • Modern heating element provides even heat distribution and low power consumption.
  • Produces 4W of heating power.
  • Requires approximately 0.33Ah at 12v / full power.
  • Outer thermal insulating layer prevents heat loss.
  • 2m silicone cable remains flexible even at low temperatures.
  • RCA / Phono Plug with moulded strain-relief - works with most dew controllers.
  • Velcro/elastic strap ensures a snug fit.
  • Smooth inner fabric protects the telescope's finish (doesn't scratch or mar the surface).
  • 12v power supply required.
  • Two year no fault replacement warranty.

Customer reviews

Average Rating (9 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
Used on an Evoguide ED50
21 February 2024  | 

Perfect fit for my ED50.

Rating (max 5):  
Great dew heater
20 November 2023  | 

Bought this to fit my SkyWatcher EvoGuide 50, fits very well. The Velcro also is elasticated so easy to keep tight to the scope. I power this via one of the power outlets on my ASI AIR, for which you also need the small adapter cable. Great service as always.

Rating (max 5):  
Excellent dew heater
19 May 2023  | 

Good quality dew heater for keeping dew at bay in colder weather. Highly recommended.

Rating (max 5):  
Useful addition
24 November 2022  | 

I have no problems with this unit and am hopeful that it will stave off the dew problem efficiently. Great advice and service from FLO, as always.

Rating (max 5):  
Lynx 20cm dew heater band
08 October 2022  | 

Well made band, with a decent length of silicone cable that remains flexible in even minus temperatures. I use this for my eyepieces to ensure that they remain clear regardless of the dew or cold.

Rating (max 5):  
20cm Dew Strap
14 February 2022  | 

Good quality. Great for my guide camera. FLO customer service 1st class.

Rating (max 5):  
Wouldn't be without these
09 December 2021  | 

It wasn't long ago that I purchased by first telescope for astrophotography. Despite the endless weeks of cloudy nights that came with the delivery of my scope (FLO, please stop putting clouds in the boxes!), I remember the growing excitement at the prospect of capturing my first target. After spending a couple of precious hours setting things up, image the disappointment when peering into the scope and seeing all that condensation knowing that the night is lost and another 3 weeks of clouds before the next opportunity presents itself! Never again.

I have purchased a number of Lynx Astro dew straps for the main scope and the guide scope and haven't had a problem with them at all. The shorter length straps do seem to warm up more quickly than the longer straps and so some experimentation on how much heating power is needed may be useful. I use mine with an ASI-AIR pro which has some basic power control and that suits me.

Perhaps the only niggle is the need for an additional adapter cable for the ASI-Air (available from FLO) but apart from that, I'll never be without these again.

Rating (max 5):  
Excellent Quality
08 December 2021  | 

Exceeded all quality expectations, these dew straps are better than anything we get here in the States. Thank you

Rating (max 5):  
Usual Boring First Class Service (Yawn)
01 February 2021  | 

Brilliant service as ever from FLO, from communication regarding stock, to superfast delivery, even now when many businesses are struggling to maintain their usual offer. Very knowledgable staff and a first class experience from start to finish. Highly recommended. The Lynx heater straps are of high quality and do exactly what it says on the tin.


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