Ok, now I know this isn't the original mount, although it is from another
Sigma lens. Sorry I don't have a digital camera to show you what this
one looks like, but I found a photo of a lens on that site with the same
mount, it's a Sigma zoom 21-35mm f 1:3.5~4.
<http://img.photobucket.com/albums/v626/cougar101/Sigmamount.jpg>
After removing the mount from the lens it was very obvious that it has
been modified. The tab indicated by the red arrow has been removed.
The DOF preview button has also been disabled, and is now just glued
in to plug the hole.
Darin
----- Original Message -----
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Friday, March 31, 2006 8:40 AM
Subject: [OM] Re: Sigma 600mm F8 reflex lens?
>I agree with your diagnosis if it simply moves freely. But I can
> hypothesize that it might have been made adjustable to relieve
> manufacturing tolerances. But in that case there should be a screw that
> will lock it in place after adjustment.
>
> Chuck Norcutt
>
> Darin wrote:
>
>> Hi Jeff,
>>
>> On your lens, is the tab in a slot like on a lens with a variable
>> aperture,
>> or is it a fixed tab on the mount? I really think this is not the
>> original
>> mount for the lens, it just makes no sense to me for the tab to be able
>> to
>> move on a fixed aperture lens.
>>
>> Darin
>>
>> ----- Original Message -----
>> From: "Jeff Keller" <jrk_om@xxxxxxxxxxx>
>> To: <olympus@xxxxxxxxxx>
>> Sent: Friday, March 31, 2006 8:01 AM
>> Subject: [OM] Re: Sigma 600mm F8 reflex lens?
>>
>>
>>
>>>
>>>Interesting ... I have one that what was sold as new in box (and probably
>>>is). The ring was put on the lens rotated (the holes are symmetrical so
>>>the
>>>ring can be rotated and still line up with the holes). The tab catches
>>>part
>>>of the camera mechanism preventing it from working.
>>>
>>>The quality control at Sig(nificant) Ma(lfunction) was unfortunate. They
>>>seem to have good ideas.
>>>
>>>-jeff
>>>
>>>----Original Message Follows----
>>>From: "Darin" <d.rhein@xxxxxxxxxxx>
>>>
>>>Hello all,
>>>
>>>I purchased this lens on ebay and have a questions about it. If any list
>>>members have one, or have had one in the past, I appreciate any help you
>>>can
>>>give me. My question is about the mount, which shows sighs of tampering
>>>(worn screws), or to be more specific the diaphram linkage tab. This
>>>being
>>>a
>>>fixed aperture lens, I would think the tab would be set at a fixed
>>>position,
>>>but it moves somewhat freely through out the slot in the mount. Is this
>>>normal, or has the mount been replaced?
>>>
>>>TIA,
>>>Darin
>>>
>>>
>>>
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>>>
>>
>>
>>
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>
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