I image in APT with an Esprit 80 and an Esprit 120. All you need to do is, as described earlier, adjust the focal length when you switch scopes in the tools tab, and hit recalc. If you forget to do this, platesolving will fail, and you may pull your hair out for an hour trying to work out why... not speaking from experience or anything
For me it will typically solve within 5-8 seconds, although a blind solve will take much longer.