Why are many Zeiss lenses manual focus only?
Asked 12/2/2011
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Zeiss lenses have a strong reputation for image quality, and many of their standalone lenses are manual focus. Is that mainly a company policy, or are there technical and business reasons for it? Why has Zeiss often chosen manual focus instead of autofocus?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
14y ago
2 Answers
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It is one of the lens design compromises they have chosen to make. While I don't think anyone can know for sure the reasons behind that decision, I can think of several likely ones:
- Zeiss's own most successful cameras are rangefinders, which do not auto focus. These are the only cameras they still make today.
- MF lenses avoid any complication from integration with an AF system, keeping the lenses smaller.
- Major SLR companies do not license their lens mounts. Companies like Sigma and Tamron reverse engineer the electronic communication protocols. Making an all-manual lens avoids this need — although recent Zeiss lenses do feature electronic coupling for aperture.
- It makes a niche, since lenses designed for MF are usually better for that purpose than those designed for AF. Good MF lenses have a long "focus throw" — you turn the focus ring a large amount to make a difference, allowing fine adjustments. AF lenses, on the other hand, are designed for smaller movements to optimize AF speed.
Originally by user1943. Source · Licensed CC BY-SA 4.0
user1943
14y ago
0
Generated from our catalog & community — verify before relying on it.
It’s not simply a company policy. Based on the answers, Zeiss’s focus on manual-focus lenses is mainly a mix of design, compatibility, and market-position choices.
Manual-focus designs can be simpler because they don’t need autofocus motors or full integration with each camera maker’s AF system. That can help keep lenses smaller and avoid the complexity of reverse-engineering electronic communication used by proprietary mounts. It also lets Zeiss target a niche of photographers who specifically want high-quality manual-focus handling.
There’s also historical context: Zeiss has long been associated with rangefinder systems, where autofocus was not central.
That said, Zeiss has not made only manual-focus lenses. The community answers point out that Zeiss-branded autofocus lenses have existed in Sony/Minolta A-mount through co-branded Sony/Zeiss products. So the better conclusion is that Zeiss often sold standalone manual-focus lenses because it fit their design and business strategy, while autofocus versions appeared where they had the right partnership and system integration.
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