Someone else may want to correct me but I suspect you might find a screw
under the rubber of the focusing ring that controls the position of the
focusing ring and infinity stop relative to the front lens group.
Loosening the screw may allow turning one relative to the other then
retighten.
Chuck Norcutt
On 9/3/2011 10:27 AM, Chris Trask wrote:
>
> It's now obvious that the problem has not been the thickness of the
> M42 mount plus adapter, but instead is an internal problem with the
> 400mm f/6.8 T4 lens. Now I just need to find out how you adjust the
> infinity position of the focusing group inside the lens. This is not
> a real problem as I also have the 400mm f/5.6 TX version, and it
> works just fine.
--
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