SUMMARY
The notion that professional photographers need the 'holy trinity' of f/2.8 zoom lenses (wide, 24-70mm, 70-200mm) is a myth rooted in the film and early digital eras. Historically, fast constant-aperture zooms were essential for low light and autofocus performance, separating professional gear from consumer options. However, modern sensors offer vastly improved high ISO capabilities, and autofocus systems now perform reliably at smaller apertures, diminishing the necessity of f/2.8 zooms for many situations. Despite these advancements, f/2.8 zooms remain valuable for specific scenarios like capturing fast-moving subjects in low light without lens changes, and for hybrid shooters who also create video content where aperture directly impacts low-light performance.
TAKEAWAYS
The 'holy trinity' of f/2.8 zoom lenses is no longer a requirement to be a professional photographer.
Modern camera sensors and autofocus systems have made f/2.8 zooms less critical than in the past.
f/2.8 zooms are still beneficial for low-light action photography and hybrid photo/video work.
The myth originated from a time when lens technology and sensor sensitivity were significantly more limited.