Billginthekeys wrote in post #3064306
okay well im looking at what i need to get, and looking at your thread. how does the adapter ring attach to the lens, i dont believe the sigma has front threads, is that an issue?
Ohh also, are you happy with just the .9 soft, or should i get some other ones too.
Wow, Sigma lenses have no front threads? (I have NO experience with Sigma). Then how do Sigma owners use the lenses with ANY filters? Some sort of an adapter?
Anyway, the UWA adapter ring screws on to the lens. The holder then slides onto the ring, then the filter itself.
When I had no idea as to what strength filter I should get, I turned to Bryan Peterson's book, Understanding Exposure, where he's devoted one chapter on Filters. There he said that his favorite is the 3-stop (= .9). On top of his recommendation, the fact that I almost always live in and travel to very sunny areas, it made a sense to get the .9 filter. As for getting soft or hard depends on what your intended images are. Basically if you're involved in shooting uneven landscapes, then soft. If you shoot lots of landscape scenes that involve straight lines like horizon in sunset/sunrise, then hard. If you can afford to get both, then all the better. If you can also afford to get .6 and .9 (2-stop and 3-stop, respectively), then all the better, too.