Just kind of wondering if it would be worth it to buy persimmon. They aren't pricey but just wondering if they would do anything different than the blues.
Huh? Those two lenses are nowhere near similar. Blue Iridium is on a VR28 base while persimmon is, well, persimmon-based. Blu-Ir is also a hell of a lot darker than persimmon (15% vs.61%). Can't get any more "different" than that. Persimmon is sometimes useful on overcast and rainy days. Up to you if you need that.
The persimmon is definitely a low light lens only, almost a specialty lens. They really offer very minimal protection from sunlight, but the sharp contrast from the lens makes it great for those gloomy gray days and when it's raining out. I use them a lot in the morning when it's foggy out, the high light transmission and contrast make it feel like you have xray vision through the fog.
Persimmon is also excellent if you live in a coastal community in which you often deal with "marine layer" which is a fog/haze that come on and off shore during the morning and evenings.
If any of you Californians have been seeing the Wahoo Fish Tacos commercials recently, Wing Lam one of the co-founding brothers appears to be sporting glossy black half jackets with persimmon lenses.
I prefer the Amber Black Polar in mild haze, HI Yellow in full out haze, Shallow Blue in between, and that's about that. Blue IR is not one I do very often anymore, but the Blue IR Polar was a killer lens when offered.