I must have a filter on all of my lenses period. Yes we buy Fuji glass which is wonderful; yes a filter can degrade the image. However, using a high quality filter that is properly coated to reduce flair can save your front element. I have trashed at least two filters due to accidents and the filter saved my front element and filter threads. For this reason I do not leave home without filters. Your mileage may vary.
I use Kenko and Hoya Pro 1 filters and IMHO they are truly outstanding. They are ultra thin, allow filter stacking if needed and the front threads allow the use of a lens cap. I just looked at the filter on my 60mm and it is a B+W 39mm E 010 1A, so I guess I have also used B+W at times.
Filters have always been a hot topic. Truth-be-told every piece of glass in front of a lens can degrade your images. But for me the trade off is well worth it.
