You do not need a telescope to photograph the Milky Way. Any interchangeable-lens camera that shoots raw and allows manual exposure can do it, and many recent phones get surprisingly close. What matters most is a dark sky, the right lens and good timing.
The lens matters more than the camera
You want a wide lens with a large maximum aperture, so it gathers as much light as possible in a short exposure.
- Focal length: 14 to 24 mm on full frame, or roughly 10 to 16 mm on APS-C. Wide enough to fit the Milky Way’s arch and a foreground.
- Aperture: f/2.8 is the minimum to aim for; f/1.4 to f/2 is better. A 20 mm f/1.8 collects more than twice the light of a 20 mm f/2.8.
- Coma: cheap fast lenses can smear corner stars into “seagull” shapes. Check reviews for astro performance specifically. Stopping down by a third of a stop often helps.
Popular choices include the Sigma 14mm f/1.8 Art, Sony FE 20mm f/1.8 G, Samyang/Rokinon 14mm f/2.8 and the Sigma 20mm f/1.4 Art. A kit zoom at f/3.5 to f/4 will work, but you will need a star tracker or stacking to get clean results.
How long can you expose?
The Earth rotates, so stars trail if the shutter stays open too long.
The 500 rule
Divide 500 by your focal length (multiplied by your sensor’s crop factor). With a 20 mm lens on full frame: 500 ÷ 20 = 25 seconds. The 500 rule dates from film and is too generous for modern high-resolution sensors; stars will look slightly stretched when you zoom in.
The NPF rule
Devised by Frédéric Michaud, the simplified NPF rule accounts for aperture and pixel size:
Exposure (s) = (35 × f-number + 30 × pixel pitch in µm) ÷ focal length in mm
For a 24 MP full-frame camera (pixel pitch about 5.9 µm) with a 20 mm f/1.8 lens: (35 × 1.8 + 30 × 5.9) ÷ 20 = (63 + 177) ÷ 20 = 12 seconds. That is half what the 500 rule suggests, and it gives pinpoint stars.
A starting exposure
For a 20 mm f/1.8 on full frame under a dark sky: 12 seconds, f/1.8, ISO 3200, raw, white balance around 3900 K. Check the histogram: the peak should sit about a third of the way from the left.
Focusing in the dark
Autofocus will not lock on stars, and the infinity mark on most lenses is not accurate.
- Switch to manual focus and turn on live view.
- Point at the brightest star or planet and magnify the view to the maximum.
- Turn the focus ring slowly until the star is as small as possible.
- Tape the ring in place so it cannot be knocked.
A Bahtinov mask made for camera lenses makes step 3 more precise.
Timing: new moon and Milky Way season
Moonlight washes out the Milky Way as badly as a city. Shoot in the week either side of new moon, or when the Moon is below the horizon.
The bright core of the Milky Way, in Sagittarius and Scorpius, is the part most people want. In the Northern Hemisphere it is visible from roughly February to October. Early in the season it rises shortly before dawn; by late spring and summer it is up for much of the night, with the best months around April to July. In September, as now, it is low in the southwest after dark, so this month and next are the last good chances until spring. In the Southern Hemisphere the core passes almost overhead during the winter months.
Darkness matters more than anything else. Aim for Bortle 3 or darker. Our Bortle scale guide explains how to judge a site.
When a star tracker helps
A star tracker is a small motorized mount that rotates your camera to match the sky. It lets you take exposures of 1 to 4 minutes at low ISO with pin-sharp stars, which means far less noise and far more detail in dust lanes.
- iOptron SkyGuider Pro ($458): single-axis tracking, 5 kg payload, simple and reliable.
- Sky-Watcher Star Adventurer GTi ($735): adds GoTo and a second motor, and can later carry a small telescope.
Prices are US list prices as of September 2026; AstroSight shows the local price.
The catch is the foreground: a tracker blurs the landscape while the stars stay sharp. The standard fix is to shoot the sky tracked, then turn tracking off and shoot the foreground separately, blending the two in editing.
A tracker also opens the door to longer lenses of 50 to 135 mm for detailed Milky Way regions, and later to small telescopes. See why the mount matters in a first deep-sky rig.
Stacking for cleaner images
Without a tracker, you can still reduce noise by shooting 10 to 20 identical frames back to back and stacking them. Software aligns the stars and averages out the noise.
- Sequator (free, Windows) handles sky and foreground separately.
- Starry Landscape Stacker (macOS) does the same.
- Siril (free, Windows, macOS, Linux) is a full astro processing tool if you want to go further.
Stacking 16 frames reduces random noise by a factor of four, roughly equivalent to shooting at a quarter of the ISO.
Beyond the Milky Way
The same kit handles star trails (hundreds of 20 to 30 second frames combined), meteor showers (wide lens, continuous shooting, patience), aurora (shorter exposures of 2 to 8 seconds to keep structure) and night timelapses.
If you would rather let the gear do the work, the Seestar S30 Pro ($699) has dedicated Milky Way and star-trail modes; compare options in the best smart telescopes of 2026.
AstroSight can suggest a lens and tracker to pair with your camera: try Milky Way, star trails and meteors from a dark site.