Re: Sigma APO's

[Colin McKie <colinmckie@xxxxxxxxxx>]

Willem-Jan Markerink wrote:
> 
> Dear gang,
> 
> I just spoke to a Sigma rep, who claimed that their APO's didn't need
> focus correction for IR either.
> I hesitate to believe that right away....the guy said the deviation
> was too little to put it on the DOF scale....so the question is: has
> any of you ever run (focus) tests on HIE with a Sigma APO at full
> aperture?
> 
> --
No, but we've taken a lot of pics on HIE with the Sigma 70-300 APO at
the 300mm end, probably at f/11-16. A couple of our shots in the IR
Gallery, the ones with the cabbage trees, were taken this way with damn
all depth of field available.

This lens definitely doesn't need refocusing beyond about 100mm,
although there is an IR mark for 70mm.

Regards,

Colin & Linda McKie

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