Viltrox AF 40mm f/2.5 vs Voigtländer Nokton D23mm f/1.2 Aspherical

Both are Nikon Z mount primes for everyday and street — here's how the specs differ and which to pick. Every spec is from the manufacturer's own catalog.

Last verified 2026-08-31 · Nikon Z mount · prices change — check the retailer

Spec	Viltrox AF 40mm f/2.5	Voigtländer Nokton D23mm f/1.2 Aspherical
Focal length	40mm	23mm
Max aperture	f/2.5	f/1.2
Type	prime	prime
Coverage	full-frame	APS-C
Mount	Nikon Z	Nikon Z

Which should you buy?

the Voigtländer Nokton D23mm f/1.2 Aspherical opens wider (f/1.2) — brighter in low light and more background blur
the Voigtländer Nokton D23mm f/1.2 Aspherical (23mm) is wider — more in the frame for street and interiors; the Viltrox AF 40mm f/2.5 (40mm) is tighter — more reach and compression for portraits
the Viltrox AF 40mm f/2.5 covers full-frame (also works on APS-C bodies); the Voigtländer Nokton D23mm f/1.2 Aspherical is APS-C-only — it won't fill a full-frame sensor

Where to buy

VILTROX 40mm F2.5 Z Mount Lens, AF 40mm f/2.5 Z Full Frame Lens for Nikon Z Mount Zf Z7II Z6II Z8 Z9 Z5 Z30 Z50

Viltrox AF 40mm f/2.5See price on Amazon

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Voigtländer Nokton D23mm f/1.2 AsphericalSee price on Amazon We could not find this one on Amazon US in Nikon Z — this button runs an Amazon search for it rather than opening a product page.

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FAQ

What's the difference between the Viltrox AF 40mm f/2.5 and the Voigtländer Nokton D23mm f/1.2 Aspherical?
The Viltrox AF 40mm f/2.5 is 40mm f/2.5 prime, full-frame; the Voigtländer Nokton D23mm f/1.2 Aspherical is 23mm f/1.2 prime, APS-C. Both fit the Nikon Z mount.

Which is better in low light, the Viltrox AF 40mm f/2.5 or the Voigtländer Nokton D23mm f/1.2 Aspherical?
The Voigtländer Nokton D23mm f/1.2 Aspherical — its f/1.2 maximum aperture lets in more light and gives more background blur than the f/2.5 of the other.

Do the Viltrox AF 40mm f/2.5 and Voigtländer Nokton D23mm f/1.2 Aspherical fit the same camera?
Yes — both are Nikon Z mount lenses, so they fit Nikon Z series (Z6/Z7/Z8/Z9 full-frame, Z50/Zfc APS-C). Note the Voigtländer Nokton D23mm f/1.2 Aspherical is APS-C-only and won't fill a full-frame sensor.

Citing these specs? Go ahead — manufacturer data, last verified 2026-08-31. Copy a ready-made reference:

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Viltrox AF 40mm f/2.5Affiliate linkSee price on Amazon