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Leica 28mm f/1.4 Summilux-M ASPH: Analysis/Example of SLOCA (Secondary Longitudinal Chromatic Aberration)

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There has been an unfounded amount of griping (in terms of optical realities) about secondary longitudinal chromatic aberration (SLOCA) with the Zeiss Milvus 50mm f/1.4 Distagon, an about $1280 lens which is highly corrected. A high level of optical correction tends to reveal secondary optical flaws (versus poorly corrected lenses, which mask/dilute them).

And so I delved into the realities of SLOCA with fast lenses; see On Secondary Color: Collective Context-Dropping regarding Zeiss Milvus 50mm f/1.4 Distagon. There, I discussed how far more expensive lenses can have as much and perhaps more SLOCA.

Now along comes the Leica 28mm f/1.4 Summilux-M ASPH, an about $5950 lens. So how does the Leica 28/1.4 Summilux do with SLOCA, at nearly 5X the price and at only 24-megapixels of detail (Leica M240)?

Leica 28mm f/1.4 Summilux-M ASPH Aperture Series: Secondary Longitudinal Chromatic Aberration (M240)

The sample image is shown at full resolution, along with crops for convenience.

If you want perfection, read resumes. But if you want perfection (or nearly so) for color correction in an f/1.4 lens, there is only one answer today: Zeiss Otus.

Sapling Growing In Boulder
f1.4 @ 12.0 sec, ISO 200; 2015-09-16 19:30:07
LEICA M (Typ 240) + Summilux-M 1:1.4/28 ASPH

[low-res image for bot]
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