Best Overall
Canon RF 100-400mm f/5.6-8 IS USM
Key details
- Weight
- 1.8 lb
- Focal Length
- 100-400mm
- Max Aperture
- f/5.6-8
- Stabilization
- Up to 5.5 stops
The RF100-400mm is the lens we reach for when the bag has to stay light but the subject is still far away. At 816 g, it is easy to carry all day, and the 100-400mm range covers everything from a portrait at 100mm to a distant bird at 400mm. That combination is why it is our best overall pick here.
Canon rates the optical stabilizer at up to 5.5 stops, or 6 stops on an R body with IBIS. We paid attention to that pairing because at 400mm every bit of steadiness helps. The lens also focuses down to 2.89 feet at 200mm and reaches 0.41x magnification at 400mm, so you can fill the frame with a flower or a small animal without switching glass.
The compromise is the f/5.6-8 aperture. In bright daylight it is fine, and we found it sharp and quick enough for sports and wildlife; indoors or under fluorescent gym lights it struggles, and the viewfinder gets darker as you zoom to 400mm. The Nano USM autofocus is quiet and smooth, and the barrel is plastic rather than weather-sealed. That is the price of the low weight, and it is a fair trade for a lens that lives in a day bag.
Pros
- 100-400mm reach at 816 g
- Up to 5.5 stops of stabilization
- 0.41x close-focus magnification
- Quiet Nano USM autofocus
Cons
- f/5.6-8 aperture struggles indoors
- Not weather-sealed
We recommend the RF100-400mm as the default Canon telephoto for most R-series owners: it pairs real reach with low weight and strong stabilization.