Camera including two light folding elements

A camera, comprising:

• a photosensor configured to capture light projected onto a surface of the photosensor;
• a first light folding element that redirects light received from an object field from a first axis to a second axis;
• a lens system that includes a lens stack having either four or five lens elements with refractive power that refract the light on the second axis such that the camera has a 35 mm equivalent focal length within a range of 85 mm to 160 mm, wherein the lens stack has only four or five refractive lens elements having, in a consecutive order from an object side of the lens system to an image side of the lens system:
• a first lens element having an object-side surface, wherein the object-side surface of the first lens element has a shape consisting of one or more convex shapes,
• a second lens element, and
• a third lens element having an object-side surface, wherein, when the lens stack has only four lens elements with refractive power, the object-side surface of the third lens element has a shape consisting of one or more concave shapes, and
• a fourth lens element having an object-side surface, wherein the object side surface of the fourth lens element has a shape consisting of one or more convex shapes;
• and
• a second light folding element that redirects the light refracted by the lens system from the second axis to a third axis to form an image of the object field at an image plane at or near a surface of the photosensor.

A device, comprising:

• one or more processors;
• one or more cameras;
• and
• a memory comprising program instructions executable by at least one of the one or more processors to control operations of the one or more cameras;
• wherein at least one of the one or more cameras is a camera comprising:
• a photosensor configured to capture light projected onto a surface of the photosensor;
• a first light folding element that redirects light received from an object field from a first axis to a second axis;
• a lens system that includes a lens stack having either four or five lens elements with refractive power that refract the light on the second axis such that the at least one camera has a 35 mm equivalent focal length within a range of 85 mm to 160 mm, wherein the lens stack has only four or five refractive lens elements having, in a consecutive order from an object side of the lens system to an image side of the lens system:
• a first lens element having an object-side surface, wherein the object-side surface of the first lens element has a shape consisting of one or more convex shapes,
• a second lens element,
• a third lens element having an object-side surface, wherein, when the lens stack has only four lens elements with refractive power, the object-side surface of the third lens element has a shape consisting of one or more concave shapes, and
• a fourth lens element having an object-side surface, wherein the object-side surface of the fourth lens element has a shape consisting of one or more convex shapes;
• and
• a second light folding element that redirects the light refracted by the lens system from the second axis to a third axis to form an image of the object field at an image plane at or near a surface of the photosensor.