August 5, 2020

What is Constant Aperture Lens

When you buy a lens or search lens information on the Internet, you may find that some zoom lenses are particularly expensive, and unlike ordinary zoom lenses, there are 3.5-5.6 and other numeric strings. Instead, you only see a number such as f/2.8, f/ 4 Wait, do you know what is special about those lenses? Let’s...