Derby Chang wrote: > Igor Roshchin wrote: > >> Hello! >> >> I finally bought a new DFA 100/2.8 Macro lens and found that >> the "clamp switch" does not provide rock solid clamping. >> It does provide a bit of dumping, and switches of AF, but >> I can still manually change the focus without much of a problem. >> >> Question to the happy owners of a DFA 100/2.8 Macro: >> Is this normal, or the clamping on your lens is rock solid? >> >> Thanks, >> >> Igor >> >> >> >> > > Same on my DFA50. The clamp is probably designed to stop the lens > drifting under its own weight (or with the weight of a ring flash). You > can always force it. > > This is similar to the FA50 and FA100 macros. But I have to say, the > feel of the FA focus is a bit better than the DFAs, which isn't as smooth. > > D > >
Here's the bit from the FA manual on the clamp. It isn't as descriptive in the DFA manual. '[I]f you turn the clamp screw to the ON position, rotation of teh focusing ring becomes tight. This helps to prevent the rotation of the focusing ring due to the lens's own weight and avoid any shift in focus" http://www.pentaximaging.com/files/manual/FA_Lenses_112205.pdf On the FAs, the focus is squeaky when the clamp is on. On the DFA, its hard to describe, but it certainly feels cheaper. D -- [EMAIL PROTECTED] http://members.iinet.net.au/~derbyc -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
