I bought this lens for next to nothing recently as part of a deal and was sufficiently distracted with the other items so that I did not notice that this lens has no aperture ring. Obviously, it is for digital and its 35mm equivalent is about 28mm-85mm. Still, its glass is pristine and, when mounted on my K1000, its image quality is stupendous. Of course, it always stops down to about f22 when the shutter is pressed.
What to do? The amount of money paid was about $3, so I cry not here. But, I do get to thinking of how to wring blood out of this stone. There really is a workaround, but the method is, perhaps, an exercise is taxing one's credibility: one can actually create a tiny shaft of metal or plastic that can fit snugly into the slot that the aperture lever runs through, preventing stopdown from closing past, say, about f8. One could do this quite effectively with mere eye evaluation but tests would define this precision more effectively, In effect, the full aperture for mounting and viewing would be preserved (as the aperture lever would be free to move within the range of f4 to f8), but, when firing the shutter, the smallest aperture would be the f8 that I had set it at. Of course, for changing to a different aperture, one would have to reposition this tiny shaft's location in the slot and that obviously requires removing the lens from its mount.
Some sane ones out there will venture to say that this is, indeed, an exercise in futility. Actually, I partially agree, but it would be a fun thing to do (giving one the feeling that this matter had been 'conquered'), and one that is really not too difficult to implement. It is a thought concerning how to deal with lenses that do have an aperture lever but place reliance for aperture information through electronics. - David Lyga