Folded camera lens designs

A lens assembly, comprising:

• N≥4 lens elements;
• and
• an image sensor having an image sensor diagonal length SDL,
• wherein with a first lens element L1 faces an object and a last lens element LN faces the image sensor, wherein the lens assembly has an effective focal length (EFL), a total track length (TTL) defined as the distance from a first surface S1 of L1 to the image sensor and a back focal length (BFL) defined as the distance from a last surface S2N of LN to the image sensor,
• wherein a ratio between SDL and a clear aperture CA(S2N) of S2N fulfills SDL/CA(S2N)>1.5,
• wherein the lens assembly has a f number f/ #<3,
• wherein a ratio BFL/TTL>0.35, and
• wherein the lens assembly is included in a folded camera.