Complex sentence: In Rangefinders frame is seen via a prism, not through the focusing lens.But most Prosumer digitals (like Nikon 5700) also offer TTL viewing through the focusing lens, projected onto its LCD screen.
Split into simpler sentences: In Rangefinders frame is seen via a prism, not through the focusing lens. However, the high-end non-SLR digitals (like the Nikon 5700) also offer TTL viewing through the focusing lens, projected onto its LCD screen.