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11-28-2011, 12:28 AM   #1
plis
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Hacking lens' memory

Hi,
Has anybody tried to read the content of lens' memory? How to start with it?
Is there any existing template of the content?

I've got F50/1.7 with AF not working (the lens is not recognizable by body). It was given to me without any information about its history. I am thinking if it would be possible to at least see what might be the problem.

Regards,
P

11-28-2011, 12:36 AM   #2
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I'm willing to bet it's a read-only chip

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11-28-2011, 06:59 AM   #3
plis
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Might be. But maybe reading and comparing to the template would give some hint. Or, if will not be readable, then I am sure it's broken...
11-28-2011, 08:14 AM   #4
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I suggest you clean the lens and camera body contacts - if the lens is not able to autofocus it is most likely a mechanical problem that is has developed rather than a software problem. I don't think the F series lenses have the degree of chipping the FA series lenses do. At any rate lens data is mostly stored on the camera, not in the lens. The lens contacts tells the camera things like what minimum and maximum aperture values are, focus distance information, and with the FA: series MTF data.

11-28-2011, 08:42 AM   #5
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It may not have memory as such, but only a programmable logic array that has been programmed to provide speficic data back to the camera. Remember, most of the work of AF is done by the camera. The lens feeds focal length data and focusing distance data only. Both of these are things that are measured and could be provided without any lens memory.
11-28-2011, 08:53 AM   #6
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Also remember that you are talking about a lens that was designed in the 1980s, the electronics package is minimal.

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11-28-2011, 10:58 PM   #7
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I'd just use the lens as manual focus before I'd tear apart such a great piece of glass trying to fix it. It's a superb lens, even if you have to focus it yourself.
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