Bought the CDM Brine & they are very nice. The fit is pretty good & the ones I bought are black frames w/ blue mirrored lenses, I think they are the 400 lenses, I paid $179.99 for them.

Something that I am not accustomed to w/ polarized sunglasses & not sure if it's the brand or the model or lenses I bought.

Every so often I see a faint second image of what I'm looking at, when looking through the Brines. Do you guys have this happen w/ your Costa Del Mar's?

Yes I have had that happen before.  I usually had to put the beer down, go to bed, and when I woke up things were usually back to normal. ;D

BTW - I have and have had a few different Costas ... never had what you are talking about

I have Costas as well and other than the scenario that KU was talking about, the only thing "image" i have ever seen is when looking out the windows of my car/truck, I can see dark lines in the windows.  Presumably from the polarization in my car windows.

I would just call their number.  They have excellent customer service.  I cant fish without my costas anymore! Just call them and they will more than likely fix them for free. good luck

Maybe they just need to be cleaned?

              -searoach