Just a quick check of my lowly, much-unloved-by-the-list Takumar (Bayonet) 1:2.5 135mm. It has half stops all the way from 2.5 to 22. All the other SMC glass I own including the Super-Multi-Coated Tak 55/1.8 do not have the half stop between the highest and next to highest f-stop. Interesting.....
Christian Skofteland [EMAIL PROTECTED] ----- Original Message ----- From: "frank theriault" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, December 15, 2002 11:29 AM Subject: Re: Pentax lens lack of half stop detents > Hi, Lon, > > I don't know why. > > But, having checked a few of my Pentax and Tak lenses, they all have 1/2 > stop detents between all of the aperture numbers, except the last > (smallest) stop, where there is no 1/2 stop detent. > > For lenses with f16 as the smallest aperture, there is no 1/2 stop > detent from f11 to f16. For those with f 22 as the smallest aperture, > there is no 1/2 stop detent from f16 to f22. > > I don't know why. > > -cheers, > frank > > Lon Williamson wrote: > > > I'm not going to rummage through my lenses, > > but on recollection alone, every Pentax Prime > > in the household lacks detents at the half-stop > > between f11 and f22. Not so for most third party > > lenses I own. > > > > Anyone know why? A subtle tip from Pentax to > > avoid stopping down so much or a cost-saving > > measure? > > > > -Lon > > -- > "The optimist thinks this is the best of all possible worlds. The > pessimist fears it is true." -J. Robert > Oppenheimer > >
