What adapter do I need to use a vintage Marexar-CX 80-250mm lens on a Nikon D3100?
Asked 8/16/2012
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I have a vintage Marexar-CX Zoom Macro 80-250mm f/4.5-4.8 lens and want to try it on a Nikon D3100. The listing said it was a Minolta-fit lens, but the lens cap is marked “PK,” so I’m not sure whether it’s Minolta MC/MD or Pentax K mount. What adapter would I need, and are there any limitations when adapting this type of lens to Nikon F?
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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I'm afraid you're going to have to figure out first whether the lens is fitted for a Minolta MC/MD mount or a Pentak K. If you can find a spot on the lens where that information is actually engraved, it would help a lot. Often with third-party lenses it will just be a two-letter identifier; in this case, "MC", "MD", "PK" or possibly just "K". If you can't find it engraved, you might have to get some help identifying the mount; either a camera or a lens back cap in the appropriate mount in good condition will let you know.
In either case, you need an adapter with an optical element to allow infinity focus. That's usually in the form of a built-in 1.4X teleconverter, so your lens will wind up being a 112-350mm f/6.3-6.7 with the adapter. If it's a Minolta mount lens, you'll need a Minolta MC/MD to Nikon F adapter. If a Pentax, you'll need a Pentax K to Nikon F adapter.
Originally by user2719. Source · Licensed CC BY-SA 4.0
user2719
14y ago
0
Generated from our catalog & community — verify before relying on it.
First identify the lens mount: for this kind of third-party vintage lens, look on the rear of the lens for a two-letter mount code such as MC, MD, PK, or K. A rear cap can also be a clue, but the cap alone isn’t always reliable.
For a Nikon D3100, either Minolta MC/MD-to-Nikon F or Pentax K-to-Nikon F adaptation is problematic if you want infinity focus. In both cases, you generally need an adapter with corrective optics, often acting like about a 1.4x teleconverter. That changes the lens behavior roughly to about 112-350mm and makes it slower.
So:
- If it’s Minolta MC/MD: get an MC/MD-to-Nikon F adapter with optical correction.
- If it’s Pentax K: get a PK/K-to-Nikon F adapter with optical correction.
Without optical correction, you typically lose infinity focus. Also expect fully manual operation: manual focus and likely stop-down metering.
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