The story is really too long to tell in its entirety but, just like Dr.
Flash, I suffer from poor memory. I picked up the supposedly
non-fitting OM->EOS adapter with AF confirm chip with the intentions of
following Moose's advice and checking more closely what was actually
going on there and whether it could be "fixed".
In the process something got jogged in my memory and this time I tried
holding the lens release button down firmly while I tried to install the
lens. The adapter fully fitted on to all three OM mount lenses that I
have with me... the Zuiko 24/2.8, Zuiko 50/3.5 and Vivitar S1 90/2.5.
It was a bit of a struggle getting the thing to slide on and off... it's
very tight... but it does go on and off. But do not let go of the lens
release button or it won't go on.
That's when I recalled the email communications I'd had with Tim Hughes
on this same adapter and a previous one which was so bad that it
wouldn't even fit on the camera let alone the lenses. Here's a quote
from last July 11
---------------------------------------------------------------------
Good news! The new adapter arrived today and this fluted adapter, just
like my much older fluted adapter, fits the Viv S1 90/2.5 macro and the
Soligor CD 35-70/2.5. There was one other non-Oly lens that had a fit
problem on some of my adapters. Right now I can't remember which one it
was but really don't care since it wasn't one that was likely to get
mounted anyhow. I may even be the old Makina 80-200/4 that I gave to
some high school kid.
But all is not perfect. There is one minor glitch in mounting which is
that the cam that the lens locking pin rides up before falling into the
lens locking detent is very short and at a 45 degree angle. The cam on
Oly camera body mounts is very long with a very shallow rise. The net
is that the lens locking pin will not ride up the cam. You cannot
completely mount the lens without depressing the release tab on the lens
until it gets up over the too high, too short cam. Once it does you
need to rock the lens back and forth a bit until the pin falls into the
detent and locks the lens firmly into place.
Before I figured this out I was ready to send the adapter back because
the lens didn't seem to want to lock into place. Then I noticed that
the stop down lever wasn't fully pushed over which meant the lens hadn't
rotated enough to complete the motion. After playing with it a bit I
realized that the problem was with the cam and that depressing the lens
release lever got the locking pin over the hump. Slightly irritating
but not really a problem if you know about it and especially if you have
adapters for each lens and rarely detach them. Other goodnesses... the
adapter actually has OM-EOS etched into the front surface. The other
one had no ID at all.
Well, the AF confirm function does work but seems a bit touchy. You do
have to hold the focus button down (I've moved mine to the back of the
camera) then I focused it roughly by eye and then started rocking the
focus ring back and forth slightly. I haven't played with it enough to
be sure but it seem to only recognize focus when the focus ring is being
turned in one direction but not the other. I'm not sure which because
when the focus indicator turned on it was a surprise and I didn't know
which way I had been turning the ring. It's just an impression that it
was always the same (but uncertain) direction.
I haven't tried anything with programming the chip. Initial fit was
very snug on body and lens but seems to have loosened up a bit already.
Those brass "springs" are probably getting depressed and may need to
be tightened back up eventually by sticking a small screwdriver blade
into the spring slot.
----------------------------------------------------------------------
So, I had figured out all of this stuff before and promptly forgot it.
In my own defense (ha, ha) I was making preparations to go on our trip
to London/Scotland and the adapter and its problems were totally
secondary. But thanks to my email trove I have (sort of) recovered my
memory.
There's even more to the story (the early part of which involves Moose,
me and Tim Hughes in a three-way conversation about these adapters.
But to cut to the chase avoid this seller... :"jiaxichen1985"
His was the adapter that would not fit a single OM mount lens and also
would not fit on the 5D body. Totally useless and unresponsive to my
complaints until I forced a full refund via ebay customer support.
The adapter that I have now that fits very tightly on all lenses (if you
depress the release button while installing) but does work and,
according to Tim, has the latest release level AF confirm chip is
<http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320655918821&ssPageName=ADME:L:OC:US:1123>
from seller "Rainbowimaging" This seller is located in New York so
shipping time was very fast for me.
If the progamming and autofocus confirmation works to my satisfaction in
the field I may buy a couple more of these.
ps: The testing on the adapter and checking whether the lenses were
being fully closed down revealed that my 24/2.8 has a slightly sticky
diaphragm. When set to f/16 if will not return to f/11 unless one first
drops to f/8 or larger and then returns to f/11. Not a problem for me
since I never shoot the 24mm at f/16. It could be the problem has been
there for years and I never noticed it. Any known problems relative to
the 24/2.8 that would account for that stickiness coming back down from
f/16? Linkage?
Chuck Norcutt
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