If the lens has floating elements to compensate for close focusing, an error
in register distance can degrade the performance significantly. 16-9 tested
a Nikon lens with a cheap adapter and got terrible results. When they got an
accurate adapter the performance was dramatically better.
Jeff Keller
-----Original Message-----
From: Chuck Norcutt [mailto:chucknorcutt@xxxxxxxxxxxxxxxx]
Subject: Re: [OM] Changing lens mount
To clarify, if the register distance of the adapted lens is shorter than
that of the body being adapted to you can never reach infinity without
inserting an optical element (which acts like a low power
tele-converter). But you could use such a setup as a macro lens
provided you don't mind not being able to focus further than a meter or
two or three. However, even if the register distance of the lens is
longer than that of the body it must be enough longer to accommodate the
thickness of an adapter. One millimeter or thereabouts is probably
about the practical minimum. The has to be enough metal for strength.
Chuck Norcutt
On 12/3/2010 3:43 PM, Andrew Fildes wrote:
> No, but it means that you may not achieve infinity focus.
> And as most lenses move a lot at the close end but not much at the long
end, you may miss inf. by quite a lot.
> Andrew Fildes
> afildes@xxxxxxxxxxxxx
>
>
>
> On 04/12/2010, at 7:24 AM, AS wrote:
>
>> The differences in register are very small....sometimes a mm or less,
what difference does that make? Does this affect the ability to focus?
>
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