The Yashica half17 was a nice little camera, and deliver good results (samples with Fuji superia200 HERE ). unfortunately it was fallen, blades and shutter mechanism went error. So I decided to dissamble the lens then put it in use with NEX.
Yashinon 3,2cm/1,7 is an old lens, as long as not against strong light, it can deliver nice color/contrast. But even in strong backlight situation detail can be captured well, despite of poor contrast.
Is it sharp? Yes..fom wide open.
|crop from above|