The Viltrox AF 16mm f/1.8 FE is an impressive ultra-wide-angle prime lens that offers pro-grade performance and image quality at an affordable price.

Abstract: Expressions which represent the elevation-plane patterns of a large TEM mode coax aperture and a TM_{01} mode circular aperture on finite circular and square ground planes have been derived ...

An aperture mask is a simple device for easier observing that increases the effective focal ratio of a telescope.

At CES 2025, Circular's second-generation smart ring brings new finishes, a titanium build, eight days of battery life, and advanced heart tracking.

Diffractsim: A diffraction simulator for exploring and visualizing physical optics Flexible, and easy-to-use Python diffraction simulator that focuses on visualizing physical optics phenomena.

A tutorial account of the geometrical theory of diffraction is presented, and as an application of the theory the near field of a circular aperture antenna is calculated. This method is useful in ...

The aperture you choose doesn't just affect depth of field and exposure, it affects image resolution too ...

Why the Focus Must Shift Backward If we consider spherical wavefronts propagating from a circular aperture (aperture radius a, focal length f, wavelength λ), the focusing efficiency trades off between ...

Circular Hole Diffraction: For a circular aperture, interference occurs between all rays from the whole area producing a series of concentric fringes.