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Dew control

Celestron Dew heater ring for 6 in SCT (94050)

An aluminium dew heater ring specified for the 6 inch Schmidt-Cassegrain, with no description published at all.

Celestron aluminium dew heater ring for a Schmidt-Cassegrain

Celestron Dew heater ring for 6 in SCT (94050)

An aluminium dew heater ring specified for the 6 inch Schmidt-Cassegrain, with no description published at all.

Tube fit
6 inch Schmidt-Cassegrain, from the title
Outside diameter
Not published by the maker.
Shield length
Not published by the maker.
Construction
Dew heater ring · Aluminium, from the title
Heater width
Not published by the maker.
Power draw
The listing gives none
Controller support
Not mentioned
Cable
Not published by the maker.
Connector
Not published by the maker.
Amazon reference
B09Y2L2GCK (same reference on 6 Amazon marketplaces)
EAN
0050234940504
  • A rigid ring sits more securely than a wrapped strip
  • Made for one named instrument, so the fit is not in question
  • The listing carries no description whatsoever

Best for: A 6 in Schmidt-Cassegrain whose corrector plate dews on every clear night

≈ $39 / £44 / €55
Check price on Amazon

Specifications

Tube fit
6 inch Schmidt-Cassegrain, from the title
Outside diameter
Not published by the maker.
Shield length
Not published by the maker.
Construction
Dew heater ring · Aluminium, from the title
Heater width
Not published by the maker.
Power draw
The listing gives none
Controller support
Not mentioned
Cable
Not published by the maker.
Connector
Not published by the maker.
Amazon reference
B09Y2L2GCK (same reference on 6 Amazon marketplaces)
EAN
0050234940504

A listing with nothing in it

Title, brand, price. No bullet points, no description, no specification. Everything above comes from the product name: an aluminium dew heater ring for the 6 inch Schmidt-Cassegrain.

What a heater ring does

It sits around the corrector cell and keeps the glass a degree or two above the dew point. On a Schmidt-Cassegrain that is the difference between an evening and twenty minutes, because the corrector plate faces the open sky and dews first.

What has to be found elsewhere

Voltage, current draw, connector type and whether a controller is required or included. Those four decide whether it can be powered at all from what you already own.

The pricing note

The Keepa record shows a considerably higher price on one European market than the others. That is recorded rather than explained, and it is worth comparing before ordering.

Availability

German, Italian and Spanish Amazon stores ran from 55 € to 60 € on the day of the survey.

American and British Amazon stores list it in local currency, which the euro range above sets aside.

French Amazon store stood above 1.6× the cheapest country. A gap that size normally means stock forwarded from abroad rather than a seller on the ground, so that figure is left out of the range above.

Figures as Keepa reported them on the day this page was last updated. Stock and pricing shift without warning.

Prices quoted in this text were read on 17 September 2026. The live price is at the top of the page.

What this fits

More dew control

  • ASToptics HazeAway 30 cm dew heater strip on a telescope tube

    ASToptics HazeAway USB heater strip 30 cm (49556)

    A 30 cm dew heater strip that wraps around the tube and runs from common 12 V power sources, for long observing and imaging sessions.

    Tube fit
    Not published by the maker.
    Outside diameter
    Not published by the maker.
    Shield length
    30 cm; the maker states other lengths exist for other apertures
    Construction
    Electrically heated dew strip — it warms the tube rather than shielding it
    Heater width
    Described as even
    Power draw
    Compatible with common 12 V sources, per the maker · The listing gives none
    Controller support
    Not published by the maker.
    Cable
    USB, from the product name
    Connector
    Not published by the maker.
    Amazon reference
    B0BPXKKMVC (same reference on 6 Amazon marketplaces)
    EAN
    4049467495567
    • A heater works where a shield fails: on a night when dew forms regardless
    • Several lengths exist, so the strip can match the tube circumference
    • No power draw figure, which is what decides battery life

    Best for: Imaging sessions where a shield alone does not keep the corrector clear

    ≈ £91 / €103
    Check price on Amazon
  • Explore Scientific dew cap fitted to a Telrad finder

    Explore Scientific Dew cap for the Telrad finder (620225)

    A dew cap for the Telrad projection finder, preventing the projection window fogging and covering it when the finder is not in use.

    Tube fit
    The Telrad projection finder, named by the maker
    Outside diameter
    Not published by the maker.
    Shield length
    Not published by the maker.
    Construction
    Dew cap for a projection finder · Impact-resistant plastic
    Heater width
    Not published by the maker.
    Power draw
    Not published by the maker.
    Controller support
    Not published by the maker.
    Cable
    Not published by the maker.
    Connector
    Not published by the maker.
    Amazon reference
    B07VG8B9CD (same reference on 5 Amazon marketplaces)
    EAN
    4007922063492
    • Addresses the single commonest failure of a projection finder on a damp night
    • Doubles as a cover, so it earns its place in the case twice
    • Made for one named finder only

    Best for: A Telrad owner whose finder fogs before the telescope does

    ≈ €29
    Check price on Amazon
  • Omegon flexible dew shield for 8 inch telescopes

    Omegon Flexible dew shield 8 in (225–245 mm)

    A flexible plastic dew shield with a velvet inner finish for tubes of 225 to 245 mm outside diameter, closed with hook-and-loop.

    Tube fit
    225 to 245 mm, from the title
    Outside diameter
    Not published by the maker.
    Shield length
    Neither is published
    Construction
    Flexible wrap-around dew shield · Flexible plastic with a black textile velvet finish inside · Hook-and-loop
    Heater width
    Not published by the maker.
    Power draw
    Not published by the maker.
    Controller support
    Not published by the maker.
    Cable
    Not published by the maker.
    Connector
    Not published by the maker.
    Amazon reference
    B00X5KH8SE (same reference on 6 Amazon marketplaces)
    EAN
    4049467457848
    • Covers the 8 in class, which is where dew is most expensive to fix
    • Velvet finish inside against both dew and reflections
    • Neither the height nor the length is published

    Best for: An 8 in Schmidt-Cassegrain or a 200 mm reflector on an autumn evening

    ≈ £88 / €96
    Check price on Amazon

The rest of this rack

  • Omegon 120 mm dovetail bar

    Omegon Dovetail bar 120 mm (56471)

    A short 120 mm dovetail bar with a flat top and a long slot, supplied with a 1/4 in hex-head screw.

    Profile
    Not stated as Vixen or otherwise
    Length
    120 mm, from the product name
    Hole spacing
    Not published by the maker.
    Slots
    Flat, with a long slot
    Material
    Neither is published
    Thickness
    Not published by the maker.
    Safety stops
    Not published by the maker.
    Accessory holes
    Not published by the maker.
    Amazon reference
    B07B3N5NLJ (same reference on 6 Amazon marketplaces)
    EAN
    4049467564713
    • A long slot is more adaptable than fixed holes
    • The mounting screw is supplied, which is one less thing to source
    • The dovetail profile is not named, and profiles are not interchangeable

    Best for: A small tube or a guide scope that needs a short, simple bar

    ≈ €29
    Check price on Amazon
  • SG Store 90 mm finder dovetail base in black aluminium

    SG Store 90 mm finder guide base

    A 90 mm black anodised aluminium dovetail base for finders and guide scopes, published with all five of its mounting holes.

    Profile
    Not named as Vixen or otherwise
    Length
    90 mm, from the product name
    Hole spacing
    Two M8 and one 1/4 in, as the maker publishes them · Two of 7 mm
    Slots
    Not published by the maker.
    Material
    Black anodised aluminium alloy
    Thickness
    Not published by the maker.
    Safety stops
    Not published by the maker.
    Accessory holes
    Not published by the maker.
    Amazon reference
    B0FD3CPRWL (same reference on 6 Amazon marketplaces)
    EAN
    4895253946818
    • Every mounting hole is specified by thread and diameter
    • Both M8 and 1/4 in threads, which covers photographic and astronomical fittings
    • The dovetail profile is not named

    Best for: Adding a finder or a small guide scope to a tube that has the holes for it

    ≈ €14
    Check price on Amazon
  • Sky-Watcher Star Adventurer ball head adapter in green

    Sky-Watcher Star Adventurer ball head adapter (S20550)

    A green ball head adapter for the Star Adventurer, listed with two different post lengths both labelled 3/8 inch.

    Profile
    Not published by the maker.
    Length
    Not published by the maker.
    Hole spacing
    Not published by the maker.
    Slots
    Not published by the maker.
    Material
    Neither is published
    Thickness
    The listing gives “0.95 cm (3/8 in)” in one bullet and “1.9 cm (3/8 in)” in another; both are reproduced
    Safety stops
    Not published by the maker.
    Accessory holes
    Attaches a ball head to the Star Adventurer
    Amazon reference
    B00YWPCNJU (same reference on 6 Amazon marketplaces)
    EAN
    0050234205504
    • The part that makes a photographic ball head usable on a tracker
    • Made by the manufacturer of the mount
    • Two different post lengths are given for the same fitting

    Best for: Putting a photographic ball head on a Star Adventurer

    ≈ $18 / £22
    Check price on Amazon

All dew control