Canon 100-400mm f/4.5

{"overview":"The Canon EF 100-400mm f\/4.5-5.6L is a telephoto zoom lens for the Canon EF autofocus mount, covering a 4x range from 100mm to 400mm with a variable maximum aperture of f\/4.5 at the wide end and f\/5.6 at the long end. As of today in 2026, that figure should be treated as indicative rather than a firm market price, and condition, optical cleanliness and whether the lens is the original IS version or the later Mark II will materially affect value at auction. Buyers researching what a 100-400L is worth should weigh this hammer result against current dealer asking prices, which sit above auction levels once commission and warranty are factored in.","buying_guide":"Inspect the front and rear elements under a strong light for fungus, haze and coating scratches, and work the aperture blades to confirm they are dry and snappy with no oil migration. On a long telephoto zoom of this type, also check that the zoom action is smooth and free of grinding or sudden looseness, that focus is consistent across the range, and that there is no separation visible at element edges.

Generated summary, 5 May 2026 — not checked by hand; prices on this page come from the sales, not from this text.