Vivitar
I have just purchased some 2" Vivitar Filters. They were on special on EBay (flea bay) for $4.50 US each. Vivitar is a very interesting optics manufacture. These filters are "new" though about 15 years old. The filters were specified for astronomic use. Vivitar produced some stunning lenses in their time. I have the 52-205 lens that I also purchased on flea bay, a beautiful lens.
When I have the 2" filters in my hot-grubby-hands I will post a review. My guess is that those these filters will not be in the league of Badder etc: for an enthusiastic newbie they may present solid value.
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