Roger's articles are always GREAT...he backs them with facts and I always learn!
I have an extensive Canon FF system and an extensive MFT system (10 lenses for each)...
I do a lot of research (ALWAYS) before I buy. I was looking into the Olympus 12-40 zoom that Roger mentions in his article. The marketing stated "PRO" ....which I laugh at, too. ....BUT...if you go to the Olympus website and read some of the finer print (which I did), about the lens on the product page, Olympus states: " this lens features all metallic construction ". Link to page here: http://www.getolympus.com/us/en/lenses/pen-omd/m-zuiko-digital-ed-12-40mm-f2-8-pro.html
Now, I would consider myself a relatively intelligent guy with a ton of experience in photography. I do not think that plastic is a bad thing in "pro" (LOL) lens design. ( I own a Canon 100mm Macro f/2.8L IS ($1000...made of plastic, incredible lens). So here is my question...If the manufacturer states "the lens features all metallic construction", would I expect that my metal lens mount is held in place by three plastic support rods...which are a main part of the construction of the lens??? I accuse Olympus of lying here. Outright. (mind you...I own two of their cameras and many of their lenses and love & enjoy their products). They need to change the data on their product page. That verbiage is not just misleading. It is not truthful. Period.
I suspect that the design may be a little lacking regarding the weight of the lens and it may be too much for the mount design and/or there was/is some manufacturing problem here... who knows.
I have not bought the lens as it is $1000...I think there "may" be some kind of problem and Olympus has not addressed it.
All respect to Roger...but I think that something is "up" with this lens, perhaps. Maybe not..but there are alternative lenses to choose from that have not been exhibiting "this" issue. LOL.
Of course...the plastic mounts are far easier to replace/repair (thanks Roger...I did not know that!)...so in the end...maybe it doesn't matter. Also..we do not know "exactly" how these lenses on the internet were damaged. People do lie, or are completely unaware of what actually happened to their lens and why it got damaged. :-)
I recently went to a photo workshop where 20 "photographers" met in a parking lot. I would say that most were not "casual" photographers. In a 10 minute span I witnessed one person dropping their camera on the asphalt, and another knocking their camera (on a tripod) over and it slammed on concrete. We had not begun shooting yet. Perhaps those individuals consider that "normal" wear-n-tear....I do not know?
..so I guess I should take everything with a grain of salt.