(This post is from an email conversation with a coworker. I thought the content might be useful for others.)

Q:  With new little baby running around, I wanted to snag a great low light (super fast) prime lens to grab some fun portraits etc..  Anyone have any feelings about the Nikon 85mm f/1.8D AF?

A:  I like the 85/1.8.  I don’t use it too much anymore since I have a couple of 2.8 zooms that cover the portrait range for day-to-day candids.  But whenever I know I am going to shoot some intentional portraits it is nearly always my go-to lens.  I used it on my DX cameras and loved it, and now use it on the D700 with the same great results.

Though the design is obviously pretty old, it is still tack sharp on the D700.  It’s nice and small, so it’s easy to carry and shoot.  And it’s cheap!  I got mine for $250 many years ago (used) and you can get a great example for $250-325 today.  The lens has a definite look to it, and I like the bokeh just fine, though I know that is very subjective.  Focus speed is typical for a non-AFS lens.  For portraits that’s completely adequate.  (BTW, you didn’t mention what body you have, but be aware that since it is not AFS, it will not AF with some of the newer low-end bodies that lack the focus screw like the D40 and D3x00.)

Yes, the new 85/1.4 is on my wish list, but not because I’m dissatisfied with the 85/1.8.  It’s just one of my character flaws…

I think the 85/1.8 is a very good lens, so I’d recommend it highly as a great value.  Unless you would be satisfied with a 50, I don’t think you’ll find another fast portrait lens for anywhere close to the price.  And the best part is that if you pick one up used you will nearly certainly get your money back out of it if you decide you don’t like it.