Most telephoto zooms that reach 400mm cost thousands and weigh well over a kilo. The Canon RF 100-400mm F5.6-8 IS USM costs about $650 and weighs around 635 grams. It’s light enough to carry on a hike, cheap enough to buy on a whim, and a lot sharper than the price suggests.

That’s why it became one of Canon’s most popular RF lenses. It’s the default “first long lens” for R50, R10, R8 and R6 Mark II owners who want to try birds, kids’ sports or airshows without committing serious money.