Astrophotography (or nightscapes) is a fascinating art form that combines landscapes, the deep sky, the Milky Way, and the silence of the night. However, it is also one of the most demanding disciplines in photography. While a lens may perform well in daylight, it can prove limited at night when each star becomes a point of light that perfectly highlights optical flaws.
Choosing the right lens is therefore essential for capturing a clean, sharp, and detailed sky.
Why is lens selection so important in astrophotography?
In night photography, light levels are very low. Photographers often shoot at wide apertures with short exposure times to prevent star trails. Under these conditions, even the slightest optical imperfection becomes visible. What goes unnoticed during the day appears clearly against a dark sky dotted with tiny points of light.
Nightscapes highlight three key criteria:
- Aperture (f/1.4 – f/2.8 ideally)
- Sharpness across the entire frame, especially in the corners
- Control of optical aberrations
It is this last point that makes all the difference between a usable image and an unusable photo.
The most common optical aberrations in nightscapes
Before buying a lens designed for astrophotography, it is essential to understand the factors that cause star distortion.
1. Chromatic aberration
It creates a colorful halo (often purple) around stars.
✔ Easy to correct in Lightroom
✘ But it’s better to use a lens that produces minimal halo right from the start
2. Spherical aberration
It causes a diffuse halo around light sources.
Result: the stars appear less sharp and lose their definition.
3. The coma
The most problematic distortion in astrophotography.
Stars located at the edges take on a comet-like shape, with a small tail.
A good lens for nightscapes must minimize this distortion.
4. Astigmatism
The stars appear elliptical, or even "saucer-shaped."
This distortion is particularly noticeable at large apertures.
Can these errors be corrected?
- Yes, by closing the aperture a little (usuallyby 1/3 to 2/3 of a stop ).
- But be careful: closing the aperture too much reduces the amount of light, forces you to increase the ISO, and can increase noise.
Good news: AI is a game-changer
Modern noise reduction software (Lightroom AI, Topaz Denoise, DxO PureRAW, etc.) has revolutionized astrophotography.
It is now possible to:
- increase the ISO without degrading image quality,
- effectively reduce digital noise,
- capture a lot of detail without losing quality.
This means that a lens with a lower maximum aperture but better optical correction can sometimes produce better results than a wide-aperture lens riddled with aberrations.
How do you choose the right lens for photographing starry skies?
To get the best results with your nightscapes, try:
✔ A wide-angle lens
Between 14mm and 24mm on a full-frame sensor (wider to include the landscape and the Milky Way).
✔ Good optical correction
Myopia and astigmatism must be properly managed.
✔ A bright opening
Between f/1.4 and f/2.8, depending on your budget and preferences.
✔ A sturdy construction
Resistant to cold and moisture; features a good focus ring.
✔ A real-world performance test
The website lenstip.com is a go-to resource for analyzing optical performance specific to nightscapes.
My personal experience with different lenses
Here are three lenses I regularly use for astrophotography:
- Samyang 14mm f/2.4: excellent for capturing the entire Milky Way, good value for the price.
- Nikon 20mm f/1.2: very fast, ideal for capturing a striking foreground.
- Nikon Z 35mm f/1.8: perfect for tighter compositions with a “cleaner” sky.
None of these lenses are perfect:
→ every lens has slight aberrations
→ no lens offers perfect correction
→ but they all produce superb results thanks to a good balance between optics and post-processing.
I’d also like to point out that an entry-level lens, when used properly and paired with effective AI noise reduction, can produce exceptional images—as long as you’re not printing in very large formats.
Conclusion: The best lens for nightscapes is the one that best controls aberrations
To take great photos of starry landscapes, the key is to choose a lens that minimizes aberrations while still being fast enough. Combine high-quality optics, precise focusing, and modern noise reduction, and you’ll easily capture sharp, clean, and highly detailed nightscapes.
