I am seeking some advice. Looking around the Internet it appears to me that gray market lens (international version/no warranty) are priced less than the equipment manufacturers product. What are the pros and cons? While the price is attractive, how does one know the true source of the gray market lens? Could it be a used lens? My sense is that purchasing from the original manufacturer is the safe way to go although you pay more. Hope I asked this correctly. I appreciate your thoughts.
The term "gray market" means different things in different countries. But all products properly described and sold as gray market are new products made by the same company as the official versions.
In the U.S. and probably some other countries, "gray market" means products imported by a company other than the manufacturer's official U.S. affiliate / importer. Normally you buy a Canon camera that was manufactured by Canon (Japan) and imported by and sold through Canon U.S.A. That camera has a warranty from Canon U.S.A., and Canon U.S.A. will repair it if it breaks. But sometimes Big Joe's Import Co. buys a bunch of cameras manufactured by Canon (Japan) directly from either Canon (Japan) or the local Canon importer in another country, brings those cameras to the U.S., and sells them here--typically a prices lower than you could get the same camera through Canon U.S.A. But if that camera breaks, there is no warranty through Canon U.S.A., and in some cases, Canon U.S.A. will refuse to repair it.
In the U.S., there is nothing illegal or unethical about selling or buying gray market products--as long as the seller properly discloses that the products are gray market.
In some countries other than the U.S., it is actually illegal to sell (and maybe even to buy) gray market products.
If you are in the U.S., the key question is will you save enough money buying gray market to offset no warranty or a most a third-party warranty, the possible refusal of the official U.S. affiliate to repair it, and the lower resale value? IMOPO the answer is
usually 'no', but there are probably some exceptions.