The Moon, easily, and bright planets with patience. The difficulty is not the camera but the alignment: the phone lens has to sit centred on the eyepiece within a fraction of a millimetre, which is why an adapter with three-axis adjustment matters.
Everyone discovers this within a week of buying a telescope, and everyone discovers the same obstacle.
Why it works at all
The eyepiece forms an image that a phone camera can focus on, exactly as an eye does. For a bright object like the Moon, a phone sensor has plenty of light to work with.
Why holding it never works
The phone lens has to be centred on the beam leaving the eyepiece and held at the right distance, and both tolerances are small. Doing that by hand while pressing a button is close to impossible, and each attempt loses the object.
What an adapter has to provide
Adjustment in three axes, so that the camera can be moved across, along and away from the eyepiece independently. A clamp with no fine adjustment turns the problem into a wrestling match in the dark.
Two dimensions to check
The eyepiece diameter range the collar accepts, measured on the eyepiece you actually use, and the phone width range with the case on. Phones with corner-mounted cameras also need more travel than some adapters offer.
If this page and the manufacturer’s own documentation disagree, follow the documentation. Every aperture, focal length, payload rating, field, eye relief, transmission figure and thread size on this page comes from the maker’s own published figures, with the unit as printed and the source named. None of it is measured here, and no figure is converted into another convention, because a converted number is a different number. And for any sensor: a pixel size means nothing without the focal length it sits behind. The same camera is well matched to one telescope and wasteful on another, and a frame rate quoted for the full sensor is not the rate achieved over the small region a planet occupies. This page reports the maker’s figures as published and computes no sampling from them.
The questions that keep arriving
Why does my photo have a black ring around it?
Because the phone lens is not centred on the exit pupil of the eyepiece, or is at the wrong distance from it. Both are adjustments, and an adapter that only clamps without allowing them cannot fix it.
Which eyepiece works best?
A longer one with generous eye relief. A short eyepiece places the exit pupil close to the glass, which is exactly where a phone camera cannot reach because the phone body gets in the way.
Last reviewed 17 September 2026