Evaluative metering is correct most of the time. It analyzes the scene, weights the meter reading toward the focus point, and produces an exposure that protects the most information across the widest area of the frame. In scenes with even illumination and a subject that occupies a significant portion of the frame, it works without adjustment. In scenes where the subject is lit differently from the background — a face in open shade against a bright street, a person near a window with an unlit room behind them — evaluative metering averages toward a wrong answer.

A sunstar is not a filter effect. It is a diffraction phenomenon produced by the aperture blades of the lens when a point light source — the sun, a street lamp, a bare bulb — is included in the frame. The RF 14-35mm f/4L IS USM produces it cleanly. The technique is to use it intentionally rather than stumble into it. The mechanics: at wide apertures, light bends minimally around the aperture blades.

Editorial photography — fashion, food, product, documentary — depends on the detail shot: a tight frame that isolates a specific element of the larger scene. Hands on a tool. A logo on a garment. The surface texture of a material. The Fujinon XF 90mm f/2 R LM WR is the lens for this work on a Fuji system — 135mm equivalent, fast autofocus linear motor, weather-resistant, and optically excellent at f/2.

Every lens on every sensor has a diffraction limit — the aperture beyond which stopping down no longer increases sharpness but instead decreases it. Light diffracts around the aperture blades, spreading the point spread function across adjacent pixels. On a high-resolution sensor like the R5’s 45-megapixel chip, diffraction becomes measurable at around f/11 and visible at f/16. By f/22, you have traded resolution for depth of field at a poor exchange rate.

An environmental portrait uses the subject’s surroundings to tell part of the story. The standard approach — 85mm at f/1.8, background reduced to a soft wash — removes the environment from the frame and makes every location look like the same location. The Sony FE 24mm f/1.4 G Master at close focus distance does the opposite: it puts the subject large in the frame while the environment behind them is recognizable and spatially coherent.

The Sigma 28-45mm f/1.8 DG DN Art is a narrow-range zoom with an unusually wide maximum aperture for its category. f/1.8 across a zoom range is a specification that did not exist at a practical price and size before the large-diameter mirrorless mounts made the optical corrections feasible. The result is a zoom that behaves like a fast prime — subject separation, low-light capability, and rendering quality at maximum aperture — with the flexibility to shift perspective without changing lenses.

The Laowa 24mm f/14 2x Macro Probe is not a conventional lens in any respect. It is a 40-centimeter tube with a 14mm front element, designed to be inserted into spaces that a normal lens cannot access — inside a glass of liquid, beneath a flower at ground level, into the interior of a hollow object. It achieves 2:1 magnification — twice life size — while maintaining a 24mm field of view, producing images that could not be made any other way.

The wide-walk shot — camera held at chest height, walking through a location, the environment flowing past at the edges of the frame — is the establishing shot of contemporary travel video. It communicates place, motion, and immersion simultaneously, and it requires a wide lens, a stabilized body, and a focal length short enough that the walking camera shake reads as kinetic energy rather than operator instability. The Tamron 17-28mm f/2.

The RF 50mm f/1.2L USM vignettes at f/1.2. This is not a defect to correct in post. Left uncorrected, it is a compositional tool that draws the eye toward the center of the frame and applies a graduated darkening to the corners. Canon’s in-camera lens correction and Lightroom’s lens profile will eliminate this automatically if you let them. You should consider not letting them. Optical vignetting at the maximum aperture of a large-diameter lens is a physical consequence of the geometry: light arriving at the sensor from the edges at oblique angles is partially blocked by the lens barrel.

The EF 100mm f/2.8L Macro IS USM focuses to 1:1 — life size. At minimum focus distance, the working distance between the front element and the subject is approximately 14 centimeters. You are very close. The depth of field at 1:1 and f/2.8 is measured in millimeters. Almost nothing is in focus. This is not a problem to solve. It is the medium to work in. Most photographers who own this lens use it between 1:4 and 1:2 — close enough to feel macro, far enough to maintain a usable depth of field.