Originally Posted by jaapv
Simple. Buy from a good shop, with guaranty. About a quick DIY test, forget about it, it can never be more than an indication.
Buying from a good shop with guaranty is an excellent suggestion, of course, and would have my preference were it not for the money.
The M8 or M8.2 is hard to find and buy from a good shop in The Netherlands, and when available I find the premium you pay for the guaranty and the good shop to be quite steep. The option I did see was almost twice the going price of the camera on sites like ebay and marktplaats.
As for the M9; While the difference between the new price (in a good shop with guaranty) and second hand price is still relatively small (between 1000 and 1500 euro), for me that 1000/1500 euro easily places the camera outside of my budget.
So considering those (admittedly personal) points, I am still interested in buying second hand. Even when taking into account the risk inherent to buying second hand, and knowing buying new from a good shop with guaranty is a safer (but more expensive) option.
That brings me to what you call an indication which might be gotten by a DIY test. This is exactly what I am looking for. (with the excellent point added that this is in no way a replacement of a good shop with a proper guaranty, and can never serve as such. It will ONLY be an indication.)
How would you set up such a DIY test which would never be more than an indication about the condition of a camera?