Should I buy a used Canon RF 24-105 f/4 or a new RF 24-105 STM?

For most photographers, I’d lean toward the used Canon RF 24-105mm f/4 L IS USM if the price is reasonable and the copy is in good condition. The main advantage is the constant f/4 aperture, which gives you more consistent exposure as you zoom and a brighter lens overall than the RF 24-105mm f/4-7.1 IS STM, especially at the long end.

Choose the new RF 24-105mm f/4-7.1 IS STM if you care most about saving money, keeping the kit lighter, and getting a new lens with a warranty. It’s a compact travel-friendly option, and the smaller size can matter a lot if you plan to carry the lens all day.

My quick rule:

1. Buy the used f/4 L if you want the more capable all-around lens and can handle the extra size/weight.
2. Buy the new STM if budget and portability matter more than maximum versatility.

If you buy used, stick to a reputable seller with a return window and check autofocus, zoom smoothness, dust, and any physical damage before keeping it. Since exact used prices and availability can vary, compare the current listings and warranty/return terms before deciding.