I have the Phoenix 19-35mm. It's very good at most apertures in the 24-35mm
range.
At 19mm you have to be more careful with it, and use fast film in bright
light. It is very sharp at the centre, but not completely sharp in the
corners until about f/11, and shows vignetting until about f/5.6.
(It will become a great standard zoom to use with the Pentax DSLR, with an
effective focal length of about 28 to 50mm. The small CCD won't use the
whole image circle, so the defects at large apertures will become
irrelevant.)
A few sample pictures can be seen at
http://ca.geocities.com/spirope/photopage.htm
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