No eyepiece at all — a sensor, a phone and a stack
A smart telescope has no eyepiece. A small optical tube sits over a camera sensor, a computer inside recognizes the star field, points itself, and adds short exposures together while a phone shows the picture filling in. It is a different activity from looking through glass, and comparing the two on sharpness misses what is actually being bought: an instrument that is out of its bag and producing a recognizable nebula in a few minutes, from a garden where an eyepiece would have shown almost nothing. The figures worth reading are not the ones usually printed largest. Aperture still sets how fast the signal builds. Sensor size and focal length together set the field of view, and that decides which objects fit at all — a wide field frames a large nebula and makes a small galaxy a handful of pixels. Plate-solving is the feature that matters most in use: it is what lets the instrument find a target from a cold start without any alignment ritual. Then the unglamorous part, which decides whether it gets used: battery life through a whole session, whether the tripod is included, how the files come off, and what the instrument still does when the phone loses its connection. Read carefully whether the images can be exported as raw frames or only as finished pictures. We compare aperture, sensor and pixel size, field of view, plate-solving and tracking, stacking behavior, battery life and file export.
Sony IMX662, 1/2.8 in, 2.9 µm pixels · single frames up to 90 s · EQ mode · light-pollution filter · 840 g (1.85 lb)
DWARFLAB's Dwarf Mini: an 840 g smart telescope with a Sony IMX662 sensor, auto GoTo, 360-degree rotation, an EQ mode with single exposures up to 90 seconds, a built-in light-pollution filter and cloud processing.
Best for: A nebula or cluster photographed from a city balcony, by someone who wants a result rather than an instrument
≈ $419
Sony IMX676, 12.5 MP square · 1.6 arcsec/pixel · magnitude 16 · apochromatic quadruplet · 50 MP mosaic 4.18° · 11 h battery
Vaonis's Vespera Pro 2: a self-contained imaging telescope with a 12.5 MP square IMX676 sensor at 1.6 arcsec per pixel, a flat-field apochromatic quadruplet, a 4.18-degree 50 MP mosaic mode, multi-night stacking, an 11-hour battery and FITS export.
Best for: Deep-sky imaging from a balcony or yard, without a separate mount, camera or laptop
≈ $2,990
Published field of view decides what fits in an image, and it follows from the sensor as much as from the optics.
Published battery life decides how many objects get worked through before going in. Classic instruments have no such constraint.
An instrument that points, tracks and stacks on its own, driven from a phone instead of an eyepiece.
How finely the unit identifies its position from the stars in the field. It is published by the maker.
It adds short exposures together to bring out signal. The published behavior describes what the unit states it does.
These instruments generally have no eyepiece. The image comes through a screen, and that is a difference in kind.
The dimension of one photosite on the sensor. With the focal length it sets the sampling, and it is published.
Published battery life is what the maker states. Cold reduces it, as on any cell.
Published tracking describes what the unit does by itself. Exact procedures belong to the manual.
This site publishes stated characteristics and compares no image results.
Automated or not, an instrument is still bounded by its aperture. Field of view says what fits in the frame, and battery life decides how many objects before packing up.
Any figure written into the body of this page was true on the day it was written. The amount shown next to each instrument is requested from the retailer as the page loads, and it is that amount, not the text, that stands.
