9 best telescope dew caps

• 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
• DN30: the length is 30cm, for outside diameter: 10cm, lens UV size is less than 72mm
• Dew heater strap is an essential accessory that protects your optical tube from excess moisture forming condensation on the corrector lens
• Cloth covered with foam insulation on outer side for maximum efficiency and performance

User questions & answers

Question:	Would this work for a 6" scope
Answer:	About 8 inches so 16 inches around plus stretch
Question:	is the measurement given for heater band or the entire length? Can you provide length of heater band itself for each length 25, 30,and 40? thanks
Answer:	These are back in stock and should be available on prime soon. Please know that you can order direct and we ship the same day.
Question:	What size would be best for an 80mm refractor telescope
Answer:	I’m not sure but the dye color were on the girls skin and that was a problem. It took a while to wash off so I wasn’t pleased with this product but they were pretty for our 5k race.
Question:	Does this come with a controller to adjust heat output
Answer:	12 headbands came in one order

Product features

SVBONY Dew Heater Strip

It prevents condensation by warming up the lens on a camera or telescope. This is a high-output model suitable for cold and highly humid environment. It has been tested for its effectiveness against condensation outdoors in winter time, when the temperature drops below 32 F. Proven effectiveness against condensation, outside in a field, at a temperature of 5 F.

*Operating time is merely listed as reference. It varies with the external temperature and the specifications of your portable battery.

A portable battery is required to operate this product (a portable battery with greater than 10,000 mAh capacity is recommended). Portable battery is not included in this product. It must be purchased separately.

Specification:

• Electrical interface: USB Power Bank is required for 2A
• Voltage: 5V
• maximum power: <10W
• Width: 50 mm
• Weight: 66g/2.32oz

Package Includes:

• 1 x DN30cm Dew Heater Strip

Stepless temperature control

Ability to adjust temperature according to different use environments;Moderate temperature, don't worry about the high temperature to damage your lens

High-quality material design

• Anti-slip protection of leather layer

Provides a steady stream of heat to your camera lens to keep it dry;No need to worry about excessive temperatures that could damage your lens

• With shrink

You can freely adjust according to different sizes of the lens; it is easier and more convenient to use

DN30cm

DN30cm Dew Heater Strip:It prevents condensation by warming up the lens on a camera or telescope. This is a high-output model suitable for cold and highly humid environment.

Product description

This simple but effective item is the heart and soul of keeping your purified water contained. This 55mm Crown or snap on light Blue cap is the industry standard cap for 3 and 5 gallon water bottles. Its standard integrated cup seals both the interior and exterior neck of the bottle. Release tab on the outer edge makes removing the cap a breeze. The cap fits both glass and plastic 3 and 5 gallon bottles with a "Crown" or "snap on" top. For reference, outside dimension for the bottle opening would be 2.165 inches. If you currently have a snap cap for the bottle the outside dimension of that cap is about 2.75 inches.

• This simple but effective item is the heart and soul of keeping your purified water contained
• Package Dimensions: 10.16 H x 3.81 L x 7.62 W (centimetres)
• Package Weight: 0.009 kilograms
• Country of Origin : United States

User questions & answers

Question:	Do these fit the primo 5 gallon jugs from wal-mart
Answer:	Yes, they fit the 5 gal jugs from Walmart. That is where we also purchased our jugs.
Question:	Do these fit Zephyrhills 5 gallon jugs
Answer:	They fit Mine.
Question:	does anyone know if this is BPA free
Answer:	Thank you for your inquiry. Yes, the dew caps are BPA free.
Question:	Do you know of a better cap for a tight seal on those store-bought or delivered 5-gallon water bottles? Thank you
Answer:	No this is the only one I found besides buying the 5 gallon at wallmart that has the screw on lids. That would be another option. These do not work that good. The whole 5 gallons dumped in my car with these caps on when I took a turn. The non spill caps work much better but are also not very tight. Honestly for transportation duct tape would work better

Product description

This simple but effective item is the heart and soul of keeping your purified water contained. This 55mm crown or Snap-On light blue cap is the industry standard cap for 3 and 5 gallon water bottles. Its standard integrated cup seals both the interior and exterior neck of the bottle. Release tab on the outer edge makes removing the cap a breeze. The cap fits both glass and plastic 3 and 5 gallon bottles with a "crown" or "Snap-On" top. For reference, outside dimension for the bottle opening would be 2.165 inches. If you currently have a snap cap for the bottle the outside dimension of that cap is about 2.75 inches will not fit the screw on type of bottle, BPA free, made in USA.

• Replacement cap for most of 3 & 5 gallon snap top water bottles, pack of 6
• Light blue cap easy to remove
• Interior cup assures a seal between bottle & cap, nice and snug
• It fits both plastic and glass water bottles
• The perfect solution to transporting water, BPA free, made in USA

User questions & answers

Question:	Are these caps reusable again and again on primo 5g and nestle 5g water bottles
Answer:	Yes, they are reusable. The jury is still out though on whether they work well doing that. However, so far so good. As for what kind of bottles, I think in general 3 & 5 gallon bottles seem to have a standard opening and they do fit this.
Question:	Do these fit the AmericanMaid bottles
Answer:	If it is with 55mm snap on top then it will fit
Question:	Are these meant to be left on when the jug is placed on the cooler? That is the kind of cap I am looking for
Answer:	No, these are caps to put on when you refill the jugs and are storing water. You need to remove the caps before using.
Question:	Will these work if storing 5 gallon side ways on stand
Answer:	Yes, it will work. Just make sure the cap clicks in all around properly. Had it on my bottles while they were rolling around in my backseat and it don’t leak.

Product description

This simple but effective item is the heart and soul of keeping your purified water contained. This 55mm crown or Snap-On light Blue cap is the industry standard cap for 3 and 5 gallon water bottles. Its standard integrated cup seals both the interior and exterior neck of the bottle. Release tab on the outer edge makes removing the cap a breeze. The cap fits both glass and plastic 3 and 5 gallon bottles with a \"crown\" or \"Snap-On\" top. For reference, outside dimension for the bottle opening would be 2. 165 inches. If you currently have a snap cap for the bottle the outside dimension of that cap is about 2. 75 inches. Dew Cap replacement (6Pk), country of origin - United States, manufacturer name - L. D. Carlson.

• Replacement cap for 3 & 5 gallon snap top water bottles
• Light Blue cap offers a release tab for easy remove
• Interior cup assures a seal between bottle & cap
• It fits both plastic and glass water bottles
• The solution to transporting water

User questions & answers

Question:	Hi everyone. Does anyone know if these will fit the crystal springs 5gal. Bottles? Thanks in advance for your response
Answer:	I use the lids on a 5 gallon Crystal Spring bottle and they fit fine.Just be careful if carrying sideways as for some reason they leak slightly.
Question:	What is the mm of the lods 48 or
Answer:	55
Question:	Will this fit a 5 gallon glass carboy
Answer:	not sure it does fit the plastic 5 gallon jugs. I am assuming it would work on glass
Question:	Will these leak if used on a Primo brand water bottle stored horizontally
Answer:	Am not familiar with Primo brand water but have used with several brands of water sold here in Florida. Some bottles leak, others do not. We store vertically to prevent leakage. We have even had bottles of the same make of water both leak and not leak.

Product description

- Replacement push caps for most of 3 & 5 gallon 55mm snap on crown top water bottles, pack of 16

- Different colors option, lids are easy to remove, and tight seal to prevent water spills.

- Interior cup assures a seal between bottle & cap, nice and snug

- It fits both plastic and glass water bottles with 55mm crown top, BPA Free and made with food grade plastics.

- The perfect solution to transporting water, BPA free, made in USA

• - Replacement push caps for most of 3 & 5 gallon 55mm snap on crown top water bottles, pack of 6
• - Different colors option, lids are easy to remove, and tight seal to prevent water spills.
• - Interior cup assures a seal between bottle & cap, nice and snug
• - It fits both plastic and glass water bottles with 55mm crown top, BPA Free and made with food grade plastics.
• - The perfect solution to transporting water, BPA free Made in USA

• Astromania flexible dew shield are constructed of black ABS plastic and are all felt lined for maximum absorbtion of moisture and baffling of stray light. Particularly strong attachment to the telescope by non-slip foam rubber at the contact area to the tube.
• The flexible design is quite practical, as it allows you to slide the dew shield behind a cupboard or next to your eyepiece case - it is optimally space-saving!
• The dew shield is lined on the inside with a black velvet-like fabric. This not only minimizes reflections but also ensures that no dew can reach the telescope's optics.
• Height of the dew shield: 385mm, total lenght: 900mm. Suitable for Telescope tubes with 250 - 270 mm diameter.A dew shield prevents your telescope optics fogging-up in the first place. It keeps the optics completely dew-free and lets you observe for hours with the optimal view.
• Flexible Velcro fastener provides optimal adaption to the diameter of the telescope or telephoto lens. Ideal for the transport - the dew shield can be placed space-saving around the tube.Very important if you live in a place that has dew often or if you use your scope in the daytime and want to keep stray light out and the contrast high.

User questions & answers

Question:	Will this fit the celestron nexus tar 5se
Answer:	Dear customer , Thanks for your contact. DN40 can be used up to a 5-inch scope. For accessories;we provide 2 months warranty;within 2 months;you can return for refund or replacement.If you have any other questions about warranty;please contact us freely;we will work with you win to win. If my reply still doesn't answer your question well or you want to know more details about this product,could you please contact us by message on Amazon? Because the customer's message can be seen in the first time on Amazon, and will solve the problem as soon as possible. Once I receive your response, I will try my best to answer your questions. Sincerely look forward to your reply. Best wishes ! Kelly
Question:	Orion apex 102mm will fit?? seems it would but inside/outside measurement reviews are all confusing to me
Answer:	Dear customer , Thanks for your contact. The length 25, 30,and 40 is the measurement given for heater band.There is a marked size chart on the ad image. For accessories;we provide 2 months warranty;within 2 months;you can return for refund or replacement.If you have any other questions about warranty;please contact us freely;we will work with you win to win. If my reply still doesn't answer your question well or you want to know more details about this product,could you please contact us by message on Amazon? Because the customer's message can be seen in the first time on Amazon, and will solve the problem as soon as possible. Once I receive your response, I will try my best to answer your questions. Sincerely look forward to your reply. Best wishes ! Kelly
Question:	Will this fit the Orion XT8i
Answer:	you can choose 30cm
Question:	Will this fit on the Celestron Nexstar 6 se
Answer:	Dear customer , Thanks for your contact. Yes,this come with a controller to adjust heat output. For accessories;we provide 2 months warranty;within 2 months;you can return for refund or replacement.If you have any other questions about warranty;please contact us freely;we will work with you win to win. If my reply still doesn't answer your question well or you want to know more details about this product,could you please contact us by message on Amazon? Because the customer's message can be seen in the first time on Amazon, and will solve the problem as soon as possible. Once I receive your response, I will try my best to answer your questions. Sincerely look forward to your reply. Best wishes ! Kelly

Product features

The advantages in a nutshell:

• compact and space-saving - flexible plastic dew shield
• stops the optics from fogging up, keeping your view clear
• velvet finish - black anti-dew and anti-reflection textile coating
• adhesive strap fastening for a secure fit
• available for various OTA diameters

Attach the dew shield to the telescope and you're ready to go

A dew shield prevents your telescope optics fogging-up in the first place. It keeps the optics completely dew-free and lets you observe for hours with the optimal view. What you have to do? Just attach this flexible dew shield to the front of the telescope and dew is no longer an issue.

Thin and can be stored anywhere

The flexible design is quite practical, as it allows you to slide the dew shield behind a cupboard or next to your eyepiece case - it is optimally space-saving!

Dew-stop: velvet finish on the inside

The dew shield is lined on the inside with a black velvet-like fabric. This not only minimizes reflections but also ensures that no dew can reach the telescope's optics.

Which telescopes is the dew shield suitable for?

For all telescopes having an optical surface at the front. That means, for example, Schmidt-Cassegrain and Maksutov telescopes. On nights with very high humidity, an additional dew shield can even be useful with Newtonians, as many observers have experienced the secondary mirror fogging-up.

Suitable for telescopes with a front outer diameter of 250-270mm

Your telescope and dew shield -an experienced team for preventing fogging during your astronomical observing evening.

Product description

Dew Shields (dew caps) trap stagnated air in the front of the telescope. The temperature of the stagnated air is slightly higher and is enough to prevent dew from forming. Dew shields can be use as a shade to block stray light from entering the telescope or during daylight torrential viewing. Stay light lowers image contrast. ATOZstars Flexible dew shields are made of black close-cell light weight foam rubber sheeting, which is non-reflective and a good insulation material. The foam rubber sheeting forms the cylindrical shape with Velcro. The dew shield rubber sheeting is slightly elastic which allows a snug fit on the telescope tube. The dew shield can slide forward as dew shield or slide back onto the telescope tube on most telescopes to protect the telescope from accidental scratching of the telescope tube. The flexible dew shield can be store away easily by roll up tight, lay flat or stays on the telescope. Rigid dew shields are difficult to store especially large ones.

• 100% compatible with Celestron Foamex 94014 Dew Shields.
• Flexible dew shields are made of non-reflective, flexible, light weight foam rubber sheeting.
• dew shields will not crack or dent like rigid (metal or hard plastic) dew shields.
• Flexible dew shields can be stored easily rolled up, lay flat or stay on the telescope.
• Flexible dew shields work better than rigid dew shield because foam rubber insulates better.

• Keep your devices from Fog Dew Freezing; when the dew was a big issue and it can keep your devices dry;the built-in aluminum film conduct even heating surface; no dead angle left
• Three-speed adjustment to meet your different needs; 0.3meters 3 gear regulator with strong-medium-weak Heating Modes; You can adjust the temperature for different use requirements; Super fast and continuous warming with fast start up to heat
• Safe usage and short circuit prevent; Alloy fiber heating wire provides super fast and continuous warming; Silicone insulation process prevents internal short circuit
• Convenient USB port design; You can connect SV172 Dew Heater Strip to power source with USB port; such as 5Vpower bank; car charger; laptop; desktop computer; etc
• 50mm narrow width does not interfere focusing; and will not produce dark corners in the field; it is also the width that reduces interference for other accessories on the lens barrel

User questions & answers

Question:	How do u get it to turn on
Answer:	Measure your outside diameter of your OTA and if it is between 203 and 221mm it will. There is other sizes available.
Question:	Is this the right size for an 8" SCT telescope
Answer:	Unfortunately no, and the other answer is incorrect. You need to go by the outside diameter of the tube, which on the NexStar 6 SE is closer to 178mm.

Product features

Let your child drink warm milk

Compatible with lens outer diameter below 101mm; it can be used for heating baby bottles or feeding bottles indoors or outdoors.

Great way to keep your telescope free from dew

Designed for astronomy telescopes, and compatible with DSLR camera lens: protecting optical devices like telescope and camera from fogging or freezing.

Protect your body in winter

SV172 Dew Heater Strip can be used as a wrist strap or knee strap to protect you from cold weather or emergency condition.

Good keep warm effect

Imitating OK cloth, SBR and Black-T three-layer keep warm material reducing heat dissipation, and the inner surface does not wrinkle after being bent. It fits the lens barrel better and which increases the keep warm effect.

Universal lens warmer

Lens Warmer prevents telescope camera lens from fogging dew by warming up the lens on a camera or telescope; it also warming up water bottle and use as wrist knee strap.

Product description

- Replacement push caps for most of 3 & 5 gallon 55mm snap on crown top water bottles

- Light blue cap easy to remove, and tight seal to prevent water spills.

- Interior cup assures a seal between bottle & cap, nice and snug

- It fits both plastic and glass water bottles with 55mm crown top, BPA Free and made with food grade safe plastics.

- The perfect solution to transporting water, BPA free, made in USA

• Replacement cap for most of 3 & 5 gallon snap top water bottles
• Light blue cap easy to remove, and tight seal to prevent water spills
• Interior cup assures a seal between bottle & cap, nice and snug
• It fits both plastic and glass water bottles with 55mm crown top, BPA Free and made with food grade safe plastics.
• The perfect solution to transporting water, BPA free, made in USA

User questions & answers

Question:	Do these caps fit the Crystal 5 gallon water bottles
Answer:	Dear customer , Thanks for your contact. It fit external lens diameter:below 101mm. For accessories;we provide 2 months warranty;within 2 months;you can return for refund or replacement.If you have any other questions about warranty;please contact us freely;we will work with you win to win. If my reply still doesn't answer your question well or you want to know more details about this product,could you please contact us by message on Amazon? Because the customer's message can be seen in the first time on Amazon, and will solve the problem as soon as possible. Once I receive your response, I will try my best to answer your questions. Sincerely look forward to your reply. Best wishes ! Kelly
Question:	Are these reusable
Answer:	It probably will. Just email or call Astromania to make sure. Also, Celestron consumer support might also know the answer.
Question:	Are these caps compatible with Primo 5Gal. Water bottles
Answer:	I believe this dew shield will fit the Orion Apex 102. To be sure, call Orion and ask for the outside tube diameter of this scope. If it falls in the range of 100 to 125mm, you'll be fine.