By Understanding lens measurements can feel like decoding a foreign language, especially when photographers casually mention “6 inch lenses” while camera specifications list everything in millimeters. Here’s what you need to know: a 6 inch lens translates to approximately 150mm in modern photography terms, and this focal length represents a sweet spot in telephoto photography that professionals have relied on for decades.
The confusion stems from photography’s historical roots. Before the metric system dominated camera specifications, lenses were measured in inches, particularly in American and British markets. …
