Can I adapt an older Sigma 24-70mm Minolta A-mount lens to a Canon EOS 4000D?
Asked 11/2/2021
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I have a Canon EOS 4000D and already use a PK-EF adapter for some Tokina lenses. I recently got an older Sigma Aspherical 24-70mm zoom, but it will not mount with that adapter. Is this lens likely to be Minolta A mount, and if so, is there any practical adapter that will let me use it on my Canon DSLR with proper focus and aperture control?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
4y ago
2 Answers
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That lens is for Minolta “A” mount for Minolta film cameras with autofocus.
It is not possible for a Canon camera to control the autofocus or aperture of a Minolta “A” mount Sigma lens.
You can buy an adapter that will mount an older Minolta MC/MD lens to a Canon EF or EF-S mount DSLR camera, or a Minolta “A” lens to a Canon Mirrorless camera, but it will not be fully functional. These adapters are really designed for manual focus, manual aperture lenses only.
There is also at least one Minolta “A” mount to Canon EF mount adapter available but it requires an additional optical element in order to correct for infinity focus. This extra optical element acts a a focal length multiplier and reduces image quality.
Do not buy this lens, or if you already own it, sell it and buy a Canon compatible lens instead.
Originally by user39427. Source · Licensed CC BY-SA 4.0
user39427
4y ago
0
Generated from our catalog & community — verify before relying on it.
If this Sigma 24-70mm is the Minolta A-mount version, there is no practical adapter solution for normal use on a Canon EOS 4000D.
A PK-EF adapter only works for Pentax K-mount lenses, so it will not fit a Minolta A-mount lens. Minolta A lenses also rely on camera-body control for autofocus and aperture, and a Canon EF/EF-S DSLR cannot properly provide that control.
There are Minolta A to Canon EF adapters, but they typically need an extra optical element to preserve infinity focus. That added glass acts like a mild teleconverter and usually reduces image quality. Even then, full autofocus/aperture functionality is not expected.
In short: on a Canon DSLR, this is generally not a worthwhile lens to adapt. The practical advice is to sell or return it and get the Canon EF/EF-S version of the lens, or another Canon-compatible standard zoom.
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