[pure-silver] Re: unsharp lens
- From: Nick Zentena <zentena@xxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Tue, 8 May 2007 05:51:58 -0400
On Monday 07 May 2007 21:38, Shannon Stoney wrote:
> >
> >http://www.butzi.net/rodenstock/apo-sironar-s/page2.htm
> >
> >Don't know if that's your version or not.
>
> I looked at this page. It tells you that the "flange focal distance"
> should be 147mm. Is this the distance from the lensboard to the film
> plane?
When looking at the diagram. It's the distance from the D mark to the film
plane when focused at infinity.
>
> It also says that maximum sharpness for this lens is at f/11-22. I
> usually stop down quite a bit more than that. Could that be the
> problem?
>
> I don't see how that could be it, because I do the same with the 90mm
> lens, and those images are plenty sharp.
Difraction has already been mentioned but unless you are making real
big
prints I don't think it should be a big issue.
Nick
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