[rollei_list] Re: 3.5 Tessar sharpness
- From: James Davis <jamesd@xxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Sat, 24 Dec 2005 12:08:41 +0000 (GMT)
On Fri, 23 Dec 2005, Richard Knoppow wrote:
> The best range is around f/8 to f/16. Rollei limits the
> stops to f/22 to avoid softening from diffraction at smaller
> stops. Optimum is probably around f/11 but anything from f/8
> on should be pretty sharp all over. The difference from
> stopping down will be most apparent in the corners. Tessars
> of any version have some residual aberrations there which
> disappear on stopping down.
Thank you very much!
Regards,
James
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