Can Minolta Maxxum (Sony A-mount) lenses be adapted to a Pentax K DSLR?
Asked 12/12/2017
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I have several Minolta Maxxum lenses and would like to use them on a Pentax K-mount DSLR. I haven’t been able to find an adapter and suspect one may not exist. Is there any practical way to do this, possibly by chaining adapters such as Maxxum to M42 and then M42 to Pentax K? Also, are Maxxum lenses the same as Sony A-mount or Sony E-mount?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
8y ago
2 Answers
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Also, are Maxxum lenses considered Sony A-mount or E-mount?
The Minolta A-mount was first marketed in North America as the "Maxxum" but in Japan it has always been the α (Alpha) mount. It is now known as the Sony A-mount or Sony α mount.
The rest of your question has already been well addressed in these questions:
Can I use lens brand X on interchangeable lens camera brand Y?
Is it possible to adapt lens from one brand into another brand's body?
In the case of adapting an α mount lenses to K-mount cameras, the issue is that the Minolta/Sony α mount has a registration distance of 44.5mm which is shorter than the 45.46mm registration distance of the K-mount. This means that the α mount lens would need to be recessed 0.96mm into the Pentax body to be capable of focusing on infinity (longer distances). That could also possibly create clearance issues with the reflex mirror in the camera.
Originally by user15871. Source · Licensed CC BY-SA 4.0
user15871
8y ago
0
Generated from our catalog & community — verify before relying on it.
Minolta Maxxum lenses are Minolta/Sony A-mount lenses, not E-mount.
In practice, adapting Maxxum/A-mount lenses to a Pentax K DSLR is not feasible for normal use. The main problem is flange focal distance: Minolta/Sony A-mount is about 44.5mm, while Pentax K is about 45.46mm. Since the Pentax body requires the lens to sit farther away, an A-mount lens would need to sit nearly 1mm inside the Pentax body to retain infinity focus, which a simple mechanical adapter cannot do.
Chaining adapters through M42 or T2 will not solve this, because each adapter adds more distance. That makes infinity focus even less likely.
A corrective optical adapter could theoretically exist, but these typically degrade image quality and are uncommon for this mount combination.
So the practical answer is: there is no straightforward, useful adapter solution for using Maxxum/A-mount lenses on a Pentax K DSLR.
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