A method in a digital camera for image capturing at least two perspective images at a constant focal length from the digital camera, where both images share a common edge portion. In particular, the sensor is used for detecting the presence of magnetized particles bonded to biological molecules that are themselves bonded to a substrate. For example, a bisoxazolidine ligand enabled the catalytic enantioselective alkynylation and alkylation of a range of aromatic and aliphatic aldehydes, generating chiral propargylic alcohols and secondary alcohols in high yields and enantiomeric excess.