APS-H Tag

For the last 7 1/2 years I have been coping with the business of multiplication factors for the focal lengths of lenses in the digital world. Right from the start, we have had equivalents to various things - occasioned by the size of the electronic sensors that were possible in the cameras at the time. Initially quite small, they progressed in size as the silicon chip makers learned to grow ever-larger surfaces.There were a number of stages that received what are now difficult names - difficult in that every one of them needs some sort of explanation and qualification when a customer enquires about it. We can liken the quandary to an alphabet - we all pretty well agree what a "B" looks like and unless you are Russian and spell it backwards or something, we don't have to refer to it as a full-frame B or an APS-C B or a 3/4" B.Every manufacturer would have their product better than the rest, if only in the advertising pamphlets. Thus was born the diagonal measurement of sensor size - based...