I am arriving in T2 at PEK at 1830 and have a domestic flight from T1 at 2050. Will this be enough time to make the transfer?

Generally, time is enough for your transfer. It is very easy to catch the shuttle bus from T2 to T1. However, they are very close between, within 10min walking distance, perhaps mroe convenient to walk there by escalator than by shuttle bus! Also I wanna tell you that all the guding signs are very clear in the airport, which are all written in Chinese and English!