Sunday, December 15, 2002, 4:40:28 PM, Lon wrote:
LW> I'm not going to rummage through my lenses,
LW> but on recollection alone, every Pentax Prime
LW> in the household lacks detents at the half-stop
LW> between f11 and f22. Not so for most third party
LW> lenses I own.
LW> Anyone know why? A subtle tip from Pentax to
LW> avoid stopping down so much or a cost-saving
LW> measure?
Hi Lon,
I can think of this explanation:
difference of 1/2 stop at f/11 - 22 is so small in absolute
physical dimensions that they did feel that making halfstops
there would not be repeatable enough due to mechanical
nature of the aperture mechanism. f/16 and f/13.5 are just
0.5mm diameter difference!
Or they cheaped out ;-)
Best regards,
Frantisek Vlcek
