How much aperture does it take?

Seeing Venus through a telescope

A brilliant white crescent, like a tiny moon. No surface: at most faint shadings in the clouds and brighter tips to the crescent, easier through a blue or violet filter — but the phase is unmistakable in almost anything.

10 mmDetectable
40 mmRecognisable
60 mmDetailed

Venus does not care about light pollution: it is bright, and the air, not the sky glow, sets the limit.

Through three telescopes, under a suburban sky

Each circle is the true field of a 10 mm eyepiece. Same target, same sky; only the aperture changes.

Detailed

The aperture it takes, by sky

Venus does not care about light pollution: it is bright, and the air, not the sky glow, sets the limit.

Level	Milky Way blazing	Milky Way, barely	No Milky Way
Detectable	10 mm	10 mm	10 mm
Recognisable	40 mm	40 mm	40 mm
Detailed	60 mm	60 mm	60 mm

What it takes to see it

The cheapest model in the catalogue that reaches each level, at its observed price. The sky changes nothing for Venus; the thresholds are observing heuristics, not optics.

Recognisable · Detailed · from 60 mm

Celestron FirstScope 76

€85 seen 7 Oct 2026 at Astroshop

The 4 mm eyepiece in the box gives 75× on 76 mm, an exit pupil of 1 mm; the 20 mm gives 15×, an exit pupil of 5.1 mm, with nothing in between. The spec table gives a central obstruction of 37%, which costs contrast on the Moon and planets.

See it at Astroshoppaid link

Also search at First Light Optics · Optique Unterlinden · Pierro Astro · Teleskop-Express

When to look

Visible for months at a time as a morning or evening star.

Open this view in the simulator Which telescope reaches it?