Starry Nights With a Sony α6400: Pinpoints vs. Trails

One Camera, Two Night-Sky Intentions

A moonless July night paired with the Sony α6400 became the perfect test bed for two approaches to astrophotography: freezing stars as sharp dots and stretching them into graceful trails. Here is how the settings differed and why.

Shot 1: Stars as Pinpoints

Setup

• Time: 21:04
• Lens: SIGMA 28-70mm F2.8 DG DN | C
• Focal length: 105 mm
• Aperture: f/2.8
• Shutter speed: 13 s
• ISO: 1600
• Edits: Snapseed for clarity and noise control

Keeping the shutter under 15 seconds at 105 mm respected the 500 rule, freezing Earth's rotation and delivering crisp points of light while the wide aperture gathered enough photons.

Shot 2: Star Trails Over 20 Minutes

Setup

• Time: 23:22
• Focal length: 42 mm
• Aperture: f/5.6
• Shutter speed: 1,227 s (~20 minutes)
• ISO: 400
• Edits: Snapseed for brightness and color balance

Dialing down ISO and stopping to f/5.6 held noise in check during the long exposure, allowing the sky's rotation to paint smooth arcs across the sensor.

Quick Reference

Creative goal	Focal length	Aperture	Shutter	ISO	Tip
Pinpoint stars	105 mm	f/2.8	13 s	1600	Use a fast aperture and follow the 500 rule
Star trails	42 mm	f/5.6	1,227 s	400	Lower ISO and secure your tripod

Why the α6400 Still Impresses

Lightweight, responsive, and surprisingly clean at higher ISOs, the Sony α6400 remains a flexible travel body. Paired with the SIGMA 28-70mm, it covered both telephoto pinpoints and wider trail shots without swapping lenses. Next challenge: chasing the Milky Way with an ultra-wide.