Why does a Minolta MD lens show a blue aperture-shaped flare on a Canon DSLR adapter?
Asked 5/19/2018
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I adapted a Minolta MD Zoom 35–135mm f/3.5–4.5 to a Canon 600D using a generic MD-to-EF adapter and noticed a blue glare in the center of the image that seems to match the aperture opening, especially at smaller apertures. Is this caused by the lens, the adapter, or the camera sensor? Can it be prevented, and would it also happen when using the lens on the original Minolta film SLR bodies it was made for?
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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This looks to me like reflection from the sensor to the rear element and back again. Film is less reflective than digital sensors so some older lenses have either no anti reflective coating on the rear element or have a coating on that element which is not as effective at cutting out reflections from the sensor side.
If I'm right, this won't happen using the lens with a film SLR.
Edit: As others have pointed out in the comments, since the adapter you are using has an optical element it's most likely that this is the source of the reflections. It's likely that the coating on a cheap adapter is of inferior quality. A higher quality adapter may well not show this issue, and in any case it should not show on the original film SLR where the adapter wont be required.
Originally by user39031. Source · Licensed CC BY-SA 4.0
user39031
8y ago
0
Generated from our catalog & community — verify before relying on it.
The most likely cause is the adapter, not the lens itself. Minolta MD lenses cannot reach infinity focus on Canon EF DSLRs without an adapter that includes a corrective glass element, and that extra glass can create internal reflections. A cheap adapter with weak coatings makes this more likely.
There may also be some reflection between the DSLR sensor and the rear optics, since digital sensors are more reflective than film and some older lenses were not designed with that in mind. But in your setup, the adapter’s optical element is the strongest suspect.
On the original Minolta film SLR, this should not be an issue because no adapter is used, and film is less reflective than a digital sensor.
If you want to adapt Minolta MD lenses more successfully, a mirrorless camera is usually a better choice than a Canon DSLR because it can use a simple non-optical adapter.
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