I know this isn't the "in" thing to do - much more 21st century to buy a 19th century lens - but I use Nikon soft focus filters and really like the look. They render some parts soft and some parts sharp in varying degrees and the combination looks very nice to my eyes. They aren't cheap - I think I paid $100 or so for each (I have two, for two different degrees of "softness"). I've also heard that the Softar filter (Zeiss I think) is also excellent. I'd avoid the cheaper soft focus filters, the ones I've seen just make everything look blurry, like you didn't know how to focus your camera.
As an added bonus if you do your own darkroom work, you can put the filter under the enlarger lens to create a soft focus effect in negatives that were sharp to begin with. And even better, you can expose part of the time with the filter under the lens and part without it for varying degrees of "softness." I actually liked this method better than using the filter on the camera since it gives you so many different options for the degree of softness. If you don't like the result with one ratio of filter to no-filter time just change the ratio and try again.
This method does reverse the way the highlights and shadows blend together as compared with doing it in camera (the blurred highlights blend in camera and the blurred shadows blend when using the filter under the enlarger or vice versa, I can never remember which is which).
Bookmarks