Originally posted by stevebrot It depends on the lens. Some do and many don't. I have a handful of modern lenses featuring mostly plastic construction and have had no issues with them in terms of durability or performance thus far. Do I prefer metal lenses? Absolutely! However, here are a few talking points:
Great post, Steve
I prefer metal lenses too, but I also have a number of partially or completely synthetic lenses that have always worked, and continue to work, just fine. It's fair to say that not all synthetic materials are made equal, and some are incredibly durable.
That said...
Originally posted by stevebrot Brittleness of plastic chassis over time
This is the one thing that bothers me...
I haven't had any problems with my plastic lenses, but a few weeks ago my HP ENVY 17 laptop was out of action for a couple of days. Despite being a high specification and quite expensive model when I bought it five or six years ago, the chassis is plastic. Over time, the area to which one of the screen hinges was attached had crumbled away. Clearly it was badly designed for the stresses involved (the 17" screen is heavy, and the hinges are rather heavy-duty accordingly), but the material also appears to be quite brittle and unsuited to the job. So, I had to partially dismantle the machine, clean out all the bits of crumbled plastic, then re-build that area using epoxy resin glue.
I can see that there must be some plastic components in lenses that are similarly prone to wear and, if the materials aren't up to the job (which may not be known until the item has been used for some time), breakages may occur.
Still, I've been fortunate so far... even with rather lightly-built plastic lenses such as the DA35 f/2.4 and DA50 f/1.8