Another possible reason is that the connectivity of your *istD's contacts (inner springs & pins) aren't very good. As a result, if the lens being mounted also has less than good connection, the camera won't be able to read the lens properly. It happened to my P50 before and some lenses worked, some didn't, but the problem was solved once the P50 contacts were disassembled and cleaned completely.

Yours regards,
Alan Chan
http://www.pbase.com/wlachan

Mine is one relatively old.  I got it perhaps 5-6 years ago new.  It
has worked fine until recently.  Rather than a QC issue, more
likely a build/design issue.  I would guess the problem is related to
age.  It has been very lightly used, but has always seemd fine until I
put it on the *istD.  Maybe I just noticed it because the *istD
complains loudly when the lens is not on A.  My other cameras have
been more forgiving.  Nonetheless, it is a relatively recent problem.

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