The Rolleiflex SL 66 SE is a medium-format single-lens reflex camera using 120 roll film, part of Rollei's SL 66 system aimed at professional studio and landscape photographers. It expanded on the SL 66 line by adding through-the-lens metering electronics while retaining the system's bellows-based focusing.

UK auction hammer prices for the SL 66 SE are thinly recorded, with the only verified saleroom result on file reaching £1,375 in 2023 — a wholesale figure achieved before buyer's premium. With so little recent data, what a Rolleiflex SL 66 SE body sells for today depends heavily on whether a lens, finder and back are included, and on cosmetic and mechanical condition; the value of complete, working outfits can sit well above body-only results.