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Moon filters

Celestron Variable Polarizing Moon Filter (94107)

A two-element polarising filter for 1.25 in eyepieces with transmission adjustable from 1 to 40 per cent by rotating its lower ring.

Celestron 94107 variable polarising moon filter

Celestron Variable Polarizing Moon Filter (94107)

A two-element polarising filter for 1.25 in eyepieces with transmission adjustable from 1 to 40 per cent by rotating its lower ring.

Transmission percentage
1 % to 40 %, adjustable, as the maker publishes it
Neutral or tinted dimming
Not published by the maker.
Fixed or variable design
Variable polarising filter, threaded for 1.25 in eyepieces · Rotate the lower ring, per the maker · Threaded on both faces, so other filters can be combined with it
Thread size
Not published by the maker.
Glass flatness
Not published by the maker.
Cell depth
Not published by the maker.
Amazon reference
B07N99RW5K (same reference on 6 Amazon marketplaces)
EAN
0050234941075
  • A published transmission range rather than a single fixed figure or a colour word
  • One filter covers what several fixed neutral filters would
  • A polarising pair costs some light even at its most open setting

Best for: The Moon across its whole cycle, where a fixed filter is right at only one phase

≈ $43 / £42 / €38
Check price on Amazon

Specifications

Transmission percentage
1 % to 40 %, adjustable, as the maker publishes it
Neutral or tinted dimming
Not published by the maker.
Fixed or variable design
Variable polarising filter, threaded for 1.25 in eyepieces · Rotate the lower ring, per the maker · Threaded on both faces, so other filters can be combined with it
Thread size
Not published by the maker.
Glass flatness
Not published by the maker.
Cell depth
Not published by the maker.
Amazon reference
B07N99RW5K (same reference on 6 Amazon marketplaces)
EAN
0050234941075

A range, not a number

One per cent to forty per cent, published. That is the specification this whole family usually lacks: most Moon filters are sold under a word, or at best a single percentage that suits one lunar phase and no other.

How the adjustment works

Two polarising elements, rotating against one another. When their axes align, transmission is highest; crossed, it falls to the minimum. The lower ring sets the angle, and the maker describes the operation in one sentence.

Where the range is useful

A crescent Moon at low power needs almost no attenuation. A full Moon in a 200 mm telescope is genuinely uncomfortable. One filter that spans both, adjusted at the eyepiece, is worth more than three fixed ones in a case.

The cost

Two polarising elements are still two more pieces of glass in the path, and even wide open a polarising pair transmits less than clear glass. On faint objects that matters; on the Moon, which is the point of this filter, it does not.

Availability

German, French, Italian and Spanish Amazon stores ran from 38 € to 49 € on the day of the survey.

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

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 moon filters

  • Omegon Premium 2 inch moon filter with 25 per cent transmission

    Omegon Premium Moon Filter 25 % 2 in

    A neutral grey Moon filter passing 25 per cent of the light, threaded for 2 in eyepieces, intended to dim the Moon without tinting it.

    Transmission percentage
    25 %, as the maker publishes it
    Neutral or tinted dimming
    Neutral — the Moon keeps its natural appearance, per the maker
    Fixed or variable design
    Neutral grey filter, threaded for 2 in eyepieces
    Thread size
    2 in filter thread
    Glass flatness
    Not published by the maker.
    Cell depth
    Not published by the maker.
    Amazon reference
    B018TN4TCO (same reference on 6 Amazon marketplaces)
    EAN
    4049467474043
    • The transmission is published as a percentage rather than a word
    • Neutral rather than tinted, so lunar colour is not altered
    • A single fixed value suits one range of phases and apertures

    Best for: A wide-field 2 in eyepiece used on the Moon at first or last quarter

    ≈ €39
    Check price on Amazon
  • Vixen 1.25 inch moon filter

    Vixen Moon filter 1.25 in (37222-5)

    A plane-parallel Moon filter that screws into 1.25 in eyepieces, sold on the quality of its substrate rather than on a stated transmission.

    Transmission percentage
    The listing gives none anywhere in the listing
    Neutral or tinted dimming
    Not published by the maker.
    Fixed or variable design
    Moon filter, threaded for 1.25 in eyepieces
    Thread size
    Not published by the maker.
    Glass flatness
    High-quality plane-parallel glass, as the maker states it
    Cell depth
    Not published by the maker.
    Amazon reference
    B0018HILMI (same reference on 6 Amazon marketplaces)
    EAN
    4955295372225
    • Plane-parallel glass is the property that keeps the image sharp at high magnification
    • A 1.25 in thread fits the eyepiece size almost everyone owns
    • No transmission percentage, so it cannot be compared with the filters beside it

    Best for: A 1.25 in eyepiece case where substrate quality matters more than a published figure

    ≈ $54 / £42 / €45
    Check price on Amazon

The rest of this rack

  • Have A Seat telescoping stool in black with cushion

    Have A Seat HAS-001 telescoping stool

    An eleven-step telescoping stool reaching 45 cm with a 25 cm seat, a cushion and a bag, listed at 1.5 kg in its title and 1160 g in its bullets.

    Seat height range
    Eleven, reaching 45 cm
    Adjustment method
    A spring mechanism that engages each step, per the maker
    Steps
    Not published by the maker.
    Load rating
    Not given as a figure; described as carrying an average adult
    Folded size
    25 cm
    Weight
    The title says 1.5 kg; the fourth bullet says 1160 g. Both are reproduced here
    Foot design
    Not published by the maker.
    Seat material
    Described by the maker as patented
    Supplied accessories
    Seat cushion, bag and carry handle
    Amazon reference
    B09QMNJ4TW (same reference on 5 Amazon marketplaces)
    EAN
    4170000029076
    • Eleven steps to 45 cm covers the range a telescope actually needs
    • A spring mechanism that clicks into each step is quicker than a twist lock
    • The listing gives two different weights for the same stool

    Best for: An observer who wants a quick spring lock rather than a twist mechanism

    ≈ €35
    Check price on Amazon
  • Hesanzol portable telescoping stool with carry strap

    Hesanzol Portable telescoping stool

    A nylon and PA66 telescoping stool adjusting from 6.3 to 45 cm, rated to 180 kg, at a published 1.1 kg with a 25.9 cm seat.

    Seat height range
    6.3 cm to 45 cm, as the maker publishes it
    Adjustment method
    Two buckles, top and bottom, twisted to open and close
    Steps
    Not published by the maker.
    Load rating
    Up to 180 kg, as the maker states it
    Folded size
    25.9 cm, as the maker publishes it
    Weight
    1.1 kg, as the maker publishes it
    Foot design
    Non-slip underside
    Seat material
    High-strength nylon and PA66
    Supplied accessories
    Adjustable nylon strap and a storage bag
    Amazon reference
    B086ZJSTJX (same reference on 6 Amazon marketplaces)
    EAN
    0053552379766
    • The lightest stool on this shelf at a published 1.1 kg
    • Names its materials specifically rather than saying “plastic”
    • A 180 kg rating is lower than the 200 kg of two rivals here

    Best for: Carrying to a dark site on foot, where every hundred grams is counted

    ≈ $24 / £17 / €26
    Check price on Amazon
  • Semptec telescoping stool with carry strap

    Semptec Urban Survival Technology ZX8711 telescoping stool

    A ten-step telescoping stool rated to 200 kg at a published 982 g, with polypropylene body, polyester strap and a steel tension spring.

    Seat height range
    Ten, as the maker states them
    Adjustment method
    Not published by the maker.
    Steps
    Not published by the maker.
    Load rating
    Up to 200 kg, as the maker states it
    Folded size
    44 × 25 × 25 cm, as the maker publishes them
    Weight
    982 g, as the maker publishes it
    Foot design
    Not published by the maker.
    Seat material
    Polypropylene stool, polyester strap, steel tension spring
    Supplied accessories
    Carry strap · German instructions
    Amazon reference
    B0D9KLZSQZ (same reference on 6 Amazon marketplaces)
    EAN
    4022107434447
    • Under a kilogram, and the figure is published to the gram
    • A 200 kg rating with named materials including a steel spring
    • Ten steps is the coarsest adjustment of the telescoping stools here

    Best for: The best weight-to-rating ratio on this shelf

    ≈ €15
    Check price on Amazon

All moon filters