Question 1

What does APO mean on the Leica 28mm f/2 APO-Summicron-SL ASPH?

Accepted Answer

APO stands for apochromatic correction — the lens is engineered so that red, green, and blue wavelengths converge at the same focal plane. In practice this means virtually no colour fringing on high-contrast edges, which is especially visible at f/2 on subjects like bare branches against a bright sky or lit signage on a dark street.

Question 2

Is the Leica APO-Summicron-SL 28mm f/2 ASPH weather-sealed?

Accepted Answer

Yes. Multiple independent reviews confirm the lens carries full weather-sealing consistent with the rest of the SL lens family. The uniform external dimensions across SL lenses also mean the sealing design is standardised — useful if you pair it with a weather-sealed body like the SL2-S.

Question 3

How does the 28mm SL compare to the Leica Summicron-M 28mm f/2 ASPH?

Accepted Answer

Both share the 28mm focal length and f/2 aperture, but they are very different tools. The Summicron-M 28mm is a compact rangefinder lens designed for the M-mount; the APO-Summicron-SL 28mm is a larger autofocus lens built for the SL mirrorless system. The SL version adds APO correction and fast autofocus — the M version rewards you with a dramatically smaller form factor for street and travel.

Question 4

Which cameras is the Leica 28mm f/2 APO-Summicron-SL ASPH compatible with?

Accepted Answer

It is a native SL-mount lens, so it fits the Leica SL2 and SL2-S directly. It also works on any L-Mount Alliance body — including Panasonic S-series and Sigma fp cameras — via the shared L-mount standard, though autofocus behaviour may vary on non-Leica bodies.

Question 5

Is the Leica 28mm f/2 ASPH good for astrophotography?

Accepted Answer

The APO correction makes a real difference for astro shooting — coloured halos around bright stars (a common flaw in uncorrected wide-angles) are strongly suppressed. The f/2 aperture allows shorter exposures to minimise star trailing. For best results, stop down slightly to f/2.8 if corner star shaping matters to you, though wide open performance is already well-regarded.

Question 6

What is the difference between the Leica 28mm f/2 APO-Summicron-SL and the Leica Summicron-SL 35mm f/2 ASPH?

Accepted Answer

The core difference is field of view: 28mm gives a noticeably wider angle, better for environmental storytelling, architecture, and landscape, while 35mm frames closer to how the human eye perceives a scene, making it a classic reportage focal length. Both share the same f/2 maximum aperture and the uniform SL external dimensions. If you want one lens for documentary work, 35mm is typically the first choice; for travel and landscape where context matters, 28mm earns its place.

Question 7

Is buying a used Leica APO-Summicron-SL 28mm f/2 ASPH worth it?

Accepted Answer

Leica SL lenses are built to professional standards with metal construction and no moving external parts — they age well. A professionally inspected second-hand copy in excellent condition performs identically to a new one optically. Every used lens on Camera-tweedehands.nl is hand-inspected and individually documented, so you know the exact condition before purchase. Minimum 12 months warranty is still included.

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Leica 28mm f/2 APO-Summicron-SL ASPH (11183)

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