Chuck Norcutt wrote:
> 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.
Hmmm. Your point is well taken. I'll have to check that out.
Gotta wait until the sun comes up again, tho'.
C'mon Othello! <g>
> The M42 adapter should not be advertised as achieving infinity focus
> unless it has an optical element.
It *does* have an optical element. I must assume that is to compensate for the
differences in registration thicknesses.
> Chuck Norcutt
keith whaley
> 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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