Glen wrote: > I have the 645n and two zoom lenses. I have the 80-160mm and the 45-85mm > zooms. On the front of the barrel of the 80-160 there is an opening that > gives access to a "wheel" or "dial" (whatever it may be called) that allows > the threaded filter ring on the very front of the lens to be rotated even > while the tulip-shaped hood. The 45-85mm zoom lens does not have this > feature. I don't understand why one lens has it and the other does not, nor > the choice for which one does
It's simply a function of release date. Pentax added this feature at a certain point in time. Lenses released before this date are without this window. P�l
