Although you have one lens which works, it should not work according to
the specs. The M42 registration distance is 45.46mm and the OM
registration distance is 46mm. There's 0.54mm of problem area in those
specs to achieving infinity focus *not* including the thickness of the
adapter. My guess is that your 105/2.8 Takumar probably focuses a
little past inifinity on a Pentax body.
The M42 adapter should not be advertised as achieving infinity focus
unless it has an optical element.
Chuck Norcutt
keith_w wrote:
> I bought one of these the other day, from an online vendor who shall remain
> nameless until he's notified of my disappointment, and actually responds.
> Depending on his response, I may or may not choose to divulge it.
> I thought this was a great idea, since I have a LOT of M42 lenses, and very
> few Oly OM lenses anymore.
> Seemed the perfect solution.
>
> It came yesterday, and this morning I attached and reattached various lenses,
> using the adapter on my OM-2MD.
>
> First complaint, the adapter doesn't quite lock into place on my OM body. It
> starts to, I think, as I can feel a little click, but it never quite actually
> locks. That problem all by itself is reason to return it for credit or my
> money back.
>
> Results of a few tests of fit and focus with six of my Pentax lenses:
>
> 35mm f/3.5 Super Takumar Type II focuses from about 1 foot to about 8
> feet.
>
> 50mm f/1.4 Super Takumar Type II focuses from about 1 foot to about 9
> feet.
>
> 50mm f/1.4 Super Takumar Type II focuses from about 15" to about 15 feet.
>
> 50mm f/1.4 Super-Multi-Coated Takumar Type II focuses from about 1 ft. to
> about 15 feet.
>
> 50mm f/1.4 SMC Takumar Type II. Won't fully seat. Lacks about 1/32 from
> fully seating. Focus test not done.
>
> 105mm f/2.8 Super-Multi-Coated Takumar. Focuses from about 4 ft. to
> infinity! Exactly as marked on the lens body. Hooray! One out of six!
>
> I just wanted to inform you folks, in case any of you were contemplating such
> a purchase... I'd hold off until the vendor contact is made, and we see what
> sort of response is made.
>
> By the way, to keep myself honest, I just went back and checked the eBay ad
> from which I made the purchase and it says, in part but specifically, "...IT
> ALLOWS INFINITY FOCUSING."
>
> Not a good thing...
>
> keith whaley
>
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