The R5 Mark II’s electronic shutter reaches 1/64000s. In practice, 1/8000s is the useful ceiling for most fast-motion subjects — athletes, birds in flight, children running — because beyond that shutter speed, the light gathering falls off steeply and ISO requirements climb into ranges where noise management becomes the dominant concern. At 1/8000s with the RF 85mm f/1.2L and ISO 1600 in full sun, you get a completely motion-frozen frame. A sprinter at 10 m/s travels 1.

Expose to the right — ETTR — is the practice of increasing exposure until the histogram is as far right as possible without clipping important highlights. It exploits the mathematical distribution of data in a RAW file: in a 14-bit file, the brightest stop of light receives half of all the available tonal values. Underexposing by one stop discards half the sensor’s information into the shadow region, where noise lives.

At f/1.2, the depth of field on an 85mm lens is approximately 2.5 centimeters at typical portrait distance. That is the width of a human eye. Focus must land on the near eye, precisely, every frame. The reason to own an RF 85mm f/1.2L DS is the RF 85mm f/1.2L DS — and the reason it is usable wide open is Eye AF on the R5 Mark II or R6 Mark II.

The old instruction — f/8 and be there — predates autofocus and has survived it intact. The RF 28mm f/2.8 STM is the current Canon lens that most efficiently implements this philosophy. Small, sharp, negligible weight, and optically honest without aspiring to be a collector’s item. It is a working lens. At f/8 on a full-frame sensor, the 28mm focal length delivers a depth of field that runs from roughly two meters to the horizon when focused at five to six meters.

The Fujinon XF 56mm f/1.2 R WR is the APS-C equivalent of a fast portrait prime — 85mm equivalent on Fuji’s 1.5x crop sensor, f/1.2 maximum aperture, weather-resistant. On the X-T5 with its 40-megapixel sensor, it produces portrait files that stand alongside full-frame results in sharpness and subject rendering. The reason to use this system rather than full-frame is not optical quality. It is color. Fujifilm’s Film Simulations are in-camera color science profiles derived from the company’s decades of film emulsion development.

Focus breathing is the change in angle of view that occurs when a lens is racked from one focus distance to another. As a lens focuses closer, many optical designs shift internally in ways that alter the effective focal length — the image either zooms in or pulls back as focus changes. For still photography, this is invisible. For video, where focus pulls are a standard part of camera movement, breathing is a visible artefact that marks the moment the operator changed focus.

Focus peaking is an EVF overlay that highlights in-focus edges in a selected color — typically red, yellow, or white — as you rotate the focus ring. It is a mirrorless-native feature, unavailable on optical viewfinders by definition, and it changes the character of manual focus work on modern cameras in ways that make the technique accessible where it was previously a specialist skill. The RF 35mm f/1.8 IS Macro STM has a smooth, well-damped manual focus ring with enough rotation travel to be used precisely.

Focus stacking is the technique of capturing multiple frames at incrementally shifted focus positions and blending them in software to produce a final image with greater depth of field than any single frame can provide. At 1:1 magnification, where a single frame at f/8 yields approximately two millimeters of sharp depth, stacking fifteen to twenty frames at overlapping focus intervals produces an image where several centimeters are in acceptable focus. This is not achievable any other way.

The Canon R5 Mark II’s IBIS combined with the RF 15-35mm f/2.8L IS USM provides up to eight stops of combined stabilization according to Canon’s specification. In practice, on a full-frame sensor at 15mm, that means a stationary subject can be photographed sharp handheld at shutter speeds as slow as 1/4 second by a photographer who has learned to hold still. This is not theoretical. It works. The technique is breath control and body mechanics.

The Tamron 70-180mm f/2.8 Di III VC VXD G2 is an unusual lens: a constant-aperture telephoto zoom for Sony E-mount that weighs 855 grams — roughly half the weight of the Sony FE 70-200mm f/2.8 G Master II. For handheld video work, that weight difference is not a specification point. It is the difference between a take you hold for ninety seconds and one you abandon at forty. The G2 version adds VC — Vibration Compensation — to the optical formula, and on a Sony body with sensor-based IBIS (A7 IV, A7R V, ZV-E1), the combined stabilization produces five to six stops of effective compensation at the telephoto end.