Originally posted by lytrytyr If a fault is typical for a particular lens in the market,
like FF/BF issues in a modern AF lens,
wobbly build in an FA 24-90,
or sticky blades on an old M42 lens,
it may be perfectly valid to review a copy with that fault.
For example, it could help someone contemplating
a BG or UG lens on KEH.
Thanks for the refinement of my comment. I was thinking of a small number of reviews where the damage was things like badly scratched elements, and even at least one with a cracked element. Such faults caused by misadventure of the lens mean that any observations are not a fair indication of the product. But the faults you refer to are the result of design or manufacture issues, and so are embedded in the product as shipped, and so are fair to include.
When I was young there was an Australian magazine,
Choice, which published consumer reviews of products. They bought them retail anonymously, and so got the normal retail service (including after sales) and they tested operation under conditions that normal people would use the product, and also did some potentially destructive tests such as tugging on power cables. If they were testing a lens they might have included a drop test onto concrete (such as from table top height) because that is an event likely to happen during the life of a real lens. Also, reviews were of a set of competing products in a comparative format. Such a contrast to the magazines that do one at a time reviews of products that distributors have suppolied to them, and would never think of actually paying for a product over the counter.
The problem that most of us have for most products is that we are forced to rely on the information that suppliers choose to make available to us, or 'sponsored' reviews, and we can only afford to buy one of anything at a time, so we cannot buy all, try them to see which suits our need best, and dispose by way of secondhand trade, all the others.
I think the reviews here are useful, but like everything, we need to read the descriptive part to try to read between the lines to determine how to let the review influence our thinking.