Rorslett's Rule is the remark that you should have three primes, each at least twice the focal length of the next widest, so you never have to wonder about which to use. (There is a version for size as well: each camera you own should be at least twice the weight of the next lightest, so you never wonder about which to pick up).

I like the rule: the focal lengths are clearly distinct, and the distinctiveness makes you think carefully about the picture you might take.

With my FM3 I use a Voigtlander 20mm, a Nikkor AI-S 50mm f/1.4, and either a Nikon 100mm f/2.8 E series or the 135mm f/2.8 E series. Rorslett's Rule satisfied. If I get a Df for digital use there are the 20mm f/1.8 and the 50mm f/1.8, but there is no small, light, short telephoto except the 85mm among modern lenses - after that it is the DC lenses, which are big and expensive, or it is all the way to the 180mm f/2.8.

So I have two questions:

What do people who use primes with the Df use for a short telephoto?

If they use the E series lenses, how well do they perform on the Df?