Originally posted by ogl it's classical portrait length. you can shoot everything, but the 85 mm is not universal focal length at all. it's rather special focal length.
85 and 105-135 mm are classical portrait lenses.
FA77 is one of the best portrait lens, first of all.
The Pentax SMCP-FA 77mm f/1.8 Limited lens is a versatile, high resolution medium-telephoto lens that was specifically designed with portrait and snapshot applications in mind. Batis 85mm f/1.8 Lens from Zeiss is a portrait-length, short telephoto lens featuring a fast f/1.8 maximum aperture for greater focus control and enhanced low-light shooting Where are the portrait lenses?: Digital Photography Review The portrait range has classically been considered as being between 85mm and 135mm for comfortable 'head and shoulders' shots The 70mm Limited is also considered a portrait prime, I think? Yet I took this non-portrait shot with it. Outdoors, in Iceland. It wasn't raining, but that doesn't mean WR on such a lens would not be useful for shots like this.
If
you only shoot portraits with focal lengths like these, and you don't need WR, that's ok. But if someone else prefers to have WR on an 85mm lens, what's the problem?
Also, I really don't care so much what a lens is designed for. If it works for what I want to do with it, that's all that matters to me.