Image pickup apparatus

An image pickup apparatus, comprising:

• an image pickup lens;
• and
• an image pickup element,
• wherein the image pickup lens comprises in order from an object side to an image side:
• a first lens unit;
• a stop;
• and
• a second lens unit having a positive refractive power, the second lens unit comprising a second lens sub-unit composed of one or more positive lenses,
• wherein each of the positive lenses included in the second lens sub-unit is made of material satisfying the following conditions:
• 62<ν2a;
• N2a<1.63;
• 0.605−(ν2a/1000)<θ2a;
• and
• dn2a/dTrelative←2.4×10−6,
• where N2a represents a refractive index at a d-line, v2a represents an Abbe constant, θ2a represents a partial dispersion ratio, and dn2a/dTrelative represents an absolute value of a differential of refractive indices against temperature at the d-line, and
• wherein the following conditions are satisfied:
• 0.20<f/f2a<0.80;
• and
• 3.00<TD/BF<6.50,
• where f represents a focal length of the image pickup lens, f2a represents a focal length of the second lens sub-unit, TD represents an overall length of the image pickup lens, and BF represents a distance from an image-side surface of a lens arranged closest to an image side in the image pickup lens to an image plane of the image pickup element.