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Moon filters

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.

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

Specifications

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

A number where the shelf usually has a word

Twenty-five per cent. That single figure is what makes this filter comparable with any other — including the variable one beside it, whose range of 1 to 40 per cent brackets this value.

Neutral, and why that is the point

A grey filter attenuates every wavelength roughly equally, so the Moon looks the same colour, only dimmer. Tinted filters shift the appearance, and the subtle colour variation across the lunar surface is one of the things a long session reveals.

The 2 in thread

Larger than the 1.25 in that dominates this shelf, and matched to wide-field eyepieces and 2 in diagonals. That makes it the right choice for a short-focal-length telescope showing the whole Moon at once.

What it does not do

Nothing gets brighter and no detail is added. The eye simply stops being overwhelmed, and contrast in the terminator region becomes easier to hold — which is what the maker describes and what actually happens.

Availability

German, French, Italian and Spanish Amazon stores ran from 39 € to 42 € on the day of the survey.

American and British Amazon catalogues hold a record for it that nobody is selling.

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

  • 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
  • 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

The rest of this rack

  • 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
  • Relaxdays black telescoping stool folded and extended

    Relaxdays Telescoping stool (10049854)

    A folding telescoping stool with a maximum seat height of about 44.5 cm, a 25 cm seat and a folded size of about 6.5 × 25 cm.

    Seat height range
    About 44.5 cm, as the maker publishes it
    Adjustment method
    Not published by the maker.
    Steps
    Not published by the maker.
    Load rating
    About 100 kg, as the maker states it
    Folded size
    44.5 × 25 × 25 cm · About 6.5 × 25 cm, as the maker publishes it · About 25 cm
    Weight
    Not published by the maker.
    Foot design
    Not published by the maker.
    Seat material
    Robust plastic
    Supplied accessories
    Carry strap · A choice is offered
    Amazon reference
    B0DBLPPJRQ (same reference on 6 Amazon marketplaces)
    EAN
    4052025874421
    • Folded dimensions published, which decides whether it fits in a full bag
    • The lowest price on this shelf for a stool with real figures
    • A 100 kg rating is half what two of its rivals here publish

    Best for: A light observer who wants the cheapest stool that still publishes its figures

    ≈ €18
    Check price on Amazon

All moon filters