I found this K mount Soligor 85-205 on ebay but it doesn't seem to have
any fixed metal bits next the the aperture arm as you've described.
<http://www.auctiva.com/hostedimages/showimage.aspx?gid=375697&image=482093854&images=482093603,482093662,482093721,482093790,482093854&formats=0,0,0,0,0&format=0>
But I think this may be what you're talking about on this Pentax 50/4
macro
<http://www.pentaxanomy.com/ebay/listings/0FC1A4E7-A789-44A1-AC6A-2E0B18BD9942.jpg>
Note the aperture arm at 1 o'clock and a "fixed metal part" below it.
This Sigma 28mm in K mount seems to have a similar appurtenance but it's
not nearly as long as the Pentax 50's. Doesn't do the full sweep.
<http://cgi.ebay.com/ws/eBayISAPI.dll?VISuperSize&item=160653415976>
Given that not all lenses seem to have it and that they're not all the
same size when they do I suspect that this is nothing but a protector
for the aperture tab when the lens gets set on its hind end. Just keeps
it from getting bent.
But maybe a Pentax owner can validate my assumption before you get out
the Dremel tool.
Chuck Norcutt
On 9/22/2011 7:02 PM, Chris Trask wrote:
> Just got my Pentax K mount adapter and tested the Soligor 85-205mm lens.
> Everything went fine until I went to take the lens off the body. It became
> jammed, but after a bit of fiddling around with careful steady pressur I
> managed to get it off. Seems that a fixed metal part right next to the
> aperture actuator came in contact with the left-most electrical contact on
> the body. They interfere by about 1-2mm. No real damage done, but I'm not
> going to use the lens again until I have the problem remedied.
>
> Nothing wrong with the lens or the adapter, so there's no reason really
> to even try returning them. Fat chance of that. I can easily remedy this
> by removing the interfering 1-2mm on the metal part. Question is, what does
> this part do on a Pentax body and will removing that bit of material impair
> it's function if it is somehow later used on a Pentax?
>
> Chris
>
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