----- Original Message ----- From: "Shel Belinkoff" <[EMAIL PROTECTED]>
> Can you account for the weight difference? > > Pål Jensen wrote: > > > There is no plastic on the A 50/1,2. I took > > one fully apart after being drowned in seawater > > and I couldn't find a single plastic piece. > -- > Shel Belinkoff > I am not Pål, but one reason to prefer the early K series lenses is the use of brass in the focussing mechanism, just as in the screwmount Takumars. Later K and M series optics use aluminum, and this works only smoothly as long as there is enough grease. Brass is a lot heavier than Aluminum, so that is probably the reason that the K lens is heavier. The cheaper A optics use plasic in their focussing mechanism, which is very resistant against seawater :-), the only advantige ? George - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
