Help needed--F100 lens mount repair

[wogears]

<p>I think my F100 is cursed. I just gave it a brand-new (old stock) back. Today I was mounting a lens, when a small (3mm sq) plastic tab broke off. Examination showed that it was the aperture indicator tab found at the outside top of the lens mount. I think this communicates the maximum aperture of the lens? I now get an FEE error with AF and chipped AI lenses. </p>

<p>Here's the question: can I replace the aperture indicator on the F100 with one from an N90s? (I have a spare one of those.) I am competent to take apart the mount and make the replacement. (I think) The advantage would be that the N90 has a METAL tab which would be unlikely to break. (Grumbles at use of plastic at critical points.) If not, are these parts available anywhere, or should I look for a 'parts camera' on eBay or at KEH? Can I find a repair manual for this mount, or at least an exploded diagram?</p>

<p>Help would be very much appreciated,<br>

Les</p>

[jim_momary]

<p>N90s service manual -<br>

<a href="http://arcticwolfs.net/">http://arcticwolfs.net/</a><br>

Select manuals on left side and enjoy.</p>

<p>Jim M.</p>

[dave_wilson1]

I don't know where my N90 is right now to look at it, but if it's the same physical size and serves the same function I can't

imagine why not unless there's some electrical contacts involved.

[User_5050610]

<p>Jim M.--wow!<br>

Thanks for THAT tip!<br>

I wasn't aware of that site before.<br>

Thanks again!<br>

Paul</p>

[jim_momary]

<p>Les -</p>

<p>I have an 18 page parts & exploded diagram/list for the F100 with very good legability.</p>

<p>The mount is on 4 pages so I cannot really post it here and make it visible.</p>

<p>If you want, contact me and I can email you a copy. Just know it looks a bit complicated.</p>

<p>Jim M</p>

[jim_momary]

<p>Any time Paul, the Internet has made resources readily available.<br>

The huge trick tho has to become adept at "combing thru the leaf piles to find your dropped car keys", figuretively. ( Don't ask !!!)</p>

<p>:o)</p>

<p>Jim</p>

[wogears]

<p>The arcticwolf site is useful, but I can't find anything relevant. (My fault, not anyone else's.) I'll probably try swapping the parts and see what happens. Need some small Torx drivers.</p>

<p>Jim: Email will be sent</p>

[Michael R Freeman]

<blockquote>

<p><em>I think this communicates the maximum aperture of the lens? I now get an FEE error with AF and chipped AI lenses.</em></p>

</blockquote>

<p>It communicates the relative aperture, i.e. Δ<em>f</em>, the difference in <em>f</em>/stops between maximum aperture (metering aperture) and the current aperture. It's the part that <strong>A</strong>utomatically <strong>I</strong>ndexes the meter for non-CPU lenses <strong>AI</strong> and <strong>Ai</strong>S lenses.</p>

<p>For AF/AF-D lenses and chipped Ai/AiS lenses it's used to confirm that the aperture ring has been rotated to minimum aperture, hence your fEE error.</p>

<p>Somehow I doubt the parts are interchangeable, but one never knows. I guess you're about to find out. Good luck. :-)</p>

[User_5050610]

<p>Jim Momary--thanks again.<br>

I'd love to know your search tricks--I spent an hour or so looking for SN lists for the F100, to no avail.<br>

The arctic site looks promising.<br>

Paul</p>

[jim_momary]

<p>Les -</p>

<p>As Meg Ryan said, you've got mail.<br>

Jim</p>

[wogears]

<p>UPDATE: Thanks to Jim's diagram, I was able to figure out the part number of the broken piece. Googling that number led me to a thread on--THIS SITE! There I found the name associated with the part number--F100 Aperture Coupling Ring. Googling THAT led me to an eBay dealer who has lots of NOS. I will now call my usual repair person and find out his cost to replace the ring; if it is too high, I will order the OEM part and install it.</p>