The magnification (or power) you will see through a given optical system depends on the telescope and the eyepiece. The simple formula is: Magnification = Focal length of telescope ÷ focal length of ...

Shini talks to us about optical instruments and how they make magnification possible. How do lenses work? How do they form images? Well, in order to understand how optics work, we have to understand ...

This article is the third in a series teaching the basics of photography. We started by learning about the properties of light and how an image is created, and we also learned how a lens bends light ...

Most consumer point and shoot digital cameras say something like, "5x optical zoom," or "9x optical zoom" on the box. But, when you move up to micro-4/3s and SLRs, you lose that. It makes sense - the ...

When you use DPReview links to buy products, the site may earn a commission. Image: Laowa Laowa has announced the 180mm F4.5 ...

Traditionally, macro lenses tend to run 1:1 or 1:2 magnification — but what if you want to blow up your subjects to absolutely insane levels of detail? The Nanoha lens from Japanese lensmakers ...