How to Photograph the Milky Way: Settings and Planning Guide

Updated September 2026

~5 min read

Milky Way photography is half astronomy, half camera craft – and the camera half is surprisingly formulaic. Here is the complete settings guide, from planning the night to the exposure recipe that works.

Plan before you shoot

The galactic core is a seasonal target: roughly March through October in the northern hemisphere, with the best months late spring through summer. You need a dark sky – check a light pollution map for Bortle 4 or darker – and a moonless window, ideally within five days of the new moon. PhotoPills or Stellarium shows exactly when and where the core rises relative to your foreground. Arrive in daylight; composing in the dark is how you end up with a power line through the galactic center.

The settings recipe

Manual mode. Widest aperture your lens offers – f/1.4 to f/2.8, because stars are point light sources and every photon counts. Shutter by the 500 rule: 500 divided by your full-frame-equivalent focal length, so about 20 seconds at 24mm, 15 at 35mm. ISO 3200-6400 to start, adjusted from the histogram. RAW, long-exposure noise reduction off (it doubles your wait between frames; you will stack instead), 2-second timer or remote release.

Focusing on stars

Autofocus cannot see stars. Switch to manual, find the brightest star or a distant light in live view, zoom to maximum magnification, and rack focus until the point is smallest. Take a test shot and check at 100% – infinity marks on lenses lie, and temperature shifts focus through the night. Tape the ring once it is right. A single soft frame at this stage is a whole night wasted, so spend the five minutes.

Field technique

Shoot the sky frames in a burst of 10-20 identical exposures for stacking. Then shoot the foreground separately: a longer exposure, a slightly higher ISO, or a low-level lighting panel swept gently across the near ground. Some photographers take a blue-hour foreground before the sky darkens – the cleanest ground detail you will get, blended later. Check corners for coma on the first frame; many fast lenses need f/2 or f/2.8 to keep stars round at the edges.

Stacking and next steps

Averaging your 10-20 identical sky frames (Sequator is the free standard; Starry Landscape Stacker on Mac) cuts noise dramatically and lets ISO 6400 look like ISO 1600. Blend the stacked sky with your best foreground frame in Photoshop. The next level up is a star tracker, which follows the sky and permits multi-minute exposures at low ISO – genuinely transformative, and genuinely another hobby. Master the single frame and the stack first; they carry 90% of the shots you will ever see.

Star trails flip the logic: you want the streaks. Either run one bulb exposure of 20-90 minutes at f/4-f/8 and ISO 100-200 (smooth trails, but sensor heat and any passing cloud leave marks), or stack 100-300 frames of 25-60 seconds at f/2.8-f/4 and ISO 400-800 in StarStax, Sequator, or Photoshop on Lighten blend – far less noise, and the gap-filling option hides frame spacing. The stacked route is the forgiving one.

Frequently asked questions

500 rule or NPF rule – which should I use?

Start with the 500 rule; graduate to NPF when you pixel-peep. The 500 rule (500 divided by focal length, so 20 seconds at 25mm on full frame) is a fast mental estimate that keeps trails invisible at normal viewing sizes. The NPF rule accounts for your specific sensor’s pixel density and aperture, giving a tighter, more accurate limit – on high-resolution bodies it often demands noticeably shorter exposures. Apps like PhotoPills compute NPF for you.

Why are my stars trailing even at 15 seconds?

Three usual causes. First, the crop factor: on APS-C the rule uses the equivalent focal length, so a 16mm lens behaves like 24mm and your limit drops to around 13 seconds. Second, high-resolution sensors reveal trailing at 100% that smaller sensors hide – shorten the exposure or accept it at normal viewing size. Third, an actual tracking error: a tripod that sagged or a bump mid-exposure. Check the trails’ direction – uniform drift in one direction means gear movement, radial elongation means exposure time.

Can I photograph the Milky Way with light pollution?

Yes, with adjusted expectations and technique. Under moderate suburban skies the galactic core still registers, especially stacked: shoot 10-20 frames and average them in post to dig the signal out of the skyglow. A light-pollution filter helps with sodium and LED skyglow. But there is no settings trick that beats geography – the difference between Bortle 6 and Bortle 3 skies is bigger than any camera upgrade, so drive dark when the shot matters.

Related guides

• Aperture, Explained
• Lightroom Presets: The Complete Guide
• Color Grading Tools: What Each One Actually Does

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