A vernier caliper can achieve a measurement of the inside diameter accurate to a tenth of a mm or better. It's an inexpensive measuring tool that I wouldn't be without.
Paul via phone > On Jul 31, 2017, at 8:54 PM, P. J. Alling <[email protected]> wrote: > > I don't remember if I ever posted this to the list, but I've been trying to > find a lens hood for this lens, since I acquired it many years ago. > > When it was originally released sometime in the late 70's early 80's it was > shipped with a lens hood, and has a large diameter front filter ring, which > is unmarked, and why would it be? After all, those front filters were and > are extremely expensive, and it does take rear filters in a much less > expensive 30.5 mm diameter of which I fortunately have the full set. > > However the lens hood disappeared sometime before it came into my possession. > > Given the cost of a decent lens hood in 95mm diameter or greater, (I've > measured the inside diameter and it might be 101mm), and the difficulty with > returning an inexpensive lens hood to China, I'm loath to order one that > might not fit. > > The slip on plastic lens cover has an inside diameter of 106mm so 112mm the > next common size up from 101mm is out. > > Unfortunately my tools and aren't very accurate for measuring the inside > diameter of the lens threads, (simply a metal rule in inches and metric), and > there's more than enough slop for the diameter to be anything between 95mm to > 103, the later of which would be just a nightmare to find. > > -- > America wasn't founded so that we could all be better. > America was founded so we could all be anything we damn well please. > - P.J. O'Rourke > > > -- > 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. -- 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.
