Using glass-mold aspheric lenses at the 5th and 7th elements, is effective to in increasing the maximum aperture (5th element) and reducing the overall thickness of the lens (7th element).

Absolutely phenomenal pancake lens. Purchased mine used from B&H and it hasnt hardly left my camera. I really enjoy the shallow depth of field at f2. The images captured by this lens are very clear but feel somewhat soft or ethereal, favorite lens in my kit.