Originally posted by biz-engineer I would really miss the Pentax system, but if there is no other choice, I'll have to sell and get back some money before the exchange value goes to zero.
If you purchased as investment, then lenses and cameras were a poor choice of vehicle. If you purchased to use, then I would evaluate the cost per shot over the lifetime of your gear multiplied by a satisfaction factor. Here in the U.S., cameras and lenses are considered to be five year properties for purposes of depreciation in tax calculations. You may want to consider your gear to be fully depreciated five years post-purchase.*
If you are feeling "pressure" based on market choices by Tamron and Sigma (both of which have been fickle for all mounts except Nikon in the last decade or so) and the flavor of posts on some portions of this site (ROFL), I suggest a change in reading/browsing habits. Avoid the rumors and photo industry sections and threads that are obvious rants and I promise less angst.
It also help to spend less time doing what I am doing (sitting at the computer) and more time shooting. It is Spring, after all. The light is back!!!
Steve
* I sold my K10D seven years post-purchase for only $150 USD with a Katz Eye screen thrown in to sweeten the deal. I consider that to be fully depreciated from the $1100 or so I paid for it new.