So the company I bought from sent me Marumi CPL's instead of LPL's. They were out of stock, but sent me SunPak LPL's temporarily. I took some test images:
CPL vs LPL
Reference:
LPL:
CPL:
And 2 stacked LPL's (the reason I got them... to simulate a Var ND):
Quite frankly, I was shocked at how bad the CPL was. I had taken shots with it before but hadn't noticed anything this bad. Perhaps it was just the worst case for this one. I re-shot it several times, no change.
Setup: Indoors, mix of incandescent and daylight. Manual focused. Close-ish object distance. Tamron 70-200mm on a tripod with 3 second remote trigger. NOT cropped, only resized and horribly compressed.
Reshot CPL with hood, adjusted manual focus, turning filter, all yielded similar results.
Maybe I got a bad copy or something. I have the option to switch my Sunpaks with Marumi LPL's early next month, anyone have any opinions on these two companies?