Moose is correct. The register distance of a T threaded lens or
accessory is 55.00mm. It's longer than the cameras it was planned to
fit to allow for the insertion of adapters. Whether you adapt a T
device to a 4/3 mount with a single adapter or with a combination
doesn't make any difference. The combined thickness of the combination
will be the same as the single adapter.
That assumes, of course, that the non-T adapter on the camera body will
allow infinity focus for that type of lens. Fortunately, the register
distance of the 4/3 mount is so short that almost any 35mm lens is OK.
I just bought a T-mount, multi-coated Spiratone 400/6.3 on the bay for
less than $21. It's a lens I recall wanting in the late 70's or early
80's but never bought. By happenstance this one has an OM mount already
installed. While I do have a single T->EOS adapter I could also just
leave the OM mount in place and use it with an OM->EOS adapter.
Chuck Norcutt
Moose wrote:
> Rand E wrote:
>> That wouldn't have worked for me. I was trying to adapt a T-Mount slide
>> copier to my E-Thingie and I needed minimum register distance.
>>
> It should work. The depth of a T=>4/3 should be the same as the combined
> depth of the two adapters, shouldn't it?
>
> The length of an OM=>4/3 adapter is always the same*, the difference in
> register distance of the two mounts. If T-mounts had only been made for
> odd things like telescopes and slide copiers, I could see where a
> T-mount adapters could be of different depths, but they were originally
> developed by independent lens makers to adapt their lenses to various
> proprietary camera mounts. So as I understand it, each one is the
> appropriate length for the register distance of the mount for which it
> is made.
>
> So, for example, the old Hanimex T mount WA my dad had focuses properly
> to infinity with the T=>Nikon mount he had and also is at the proper
> register distance on an OM body with the, different length, T=>OM mount
> adapter I bought to attach OM bodies to a Meade telescope.
>
> Moose
>
> * Yes, I am aware of the small difference reported between the original,
> free, OM=>4/3 adapters and the later MA-1.
>
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