On Sat, Nov 20, 2010 at 12:41 AM, Boris Liberman <bori...@gmail.com> wrote: > On 11/19/2010 7:39 PM, Adam Maas wrote: >> >> There's only two issues with plastic bayonets. >> >> 1. They are far more likely to fail if any off-axis force is applied >> to the lens. I've seen quite a number of these, usually with kit >> zooms. This is not likely to be an issue with smaller primes like the >> DA L 35 though as there's much less of a moment arm available to put >> force on the bayonet lugs if the lens gets knocked. >> >> 2. They do wear quicker than a metal bayonet. VERY unlikely to be a >> real-world issue unless you change lenses multiple times per day, >> every day, for 10+ years. It's only under very heavy use that bayonet >> wear becomes an issue. >> >> -Adam > > Adam, isn't it then a logical conclusion that if one exercises minimal > caution during lens change and does not change their lenses every 5 minutes, > plastic bayonets are as good as the metal ones? > > Boris
Yes for compact lenses, not so much for physically longer lenses. It's not an issue for something like the DA L 35, but even a DA L 18-55 is long enough that a sharp knock can break a bayonet lug (seen this on a number of similarly sized lenses to the DA L 18-55). Wear isn't an issue in any realistic circumstance. -Adam -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
