Canon RF-S 18-150mm f/3.5-6.3 IS STM Zoom Lens

This Canon RF-S zoom covers 18–150mm and is designed for APS-C cameras with the RF mount. It suits travel, family photography and everyday details. The range lets you adjust framing from a fixed position without changing lenses. The maximum aperture narrows towards the long end, which matters when light is limited.

Canon introduced the lens in 2022. Its compact body is useful when packing a small kit. Choose the range for the scenes you expect, and consider protection in wet weather because the lens has no weather sealing.

The lens weighs 10.9 oz (310 g), light for a zoom covering this much range. It measures 3.33 in (84.5 mm) long and 2.72 in (69 mm) wide, so it stays compact on an APS-C body. Screw-in filters must match the 55mm thread, so a polariser or ND filter in that size fits directly.

On APS-C, 18mm gives a moderately wide view for streets, interiors and landscapes. At 150mm, distant subjects appear larger from the same position. Framing still depends on subject size and distance. Camera position determines perspective, so watch the relationship between foreground and background when you move.

The maximum aperture narrows from f/3.5 at 18mm to f/6.3 at 150mm. In dim light, a higher ISO may be needed to retain a suitable shutter speed. A nearby subject can still have a soft background when there is enough space behind it. Choose settings for both exposure and depth of field.

In autofocus, closest focus is 0.6 ft (17 cm) at 18mm, measured from the sensor. The 0.59x maximum magnification requires manual focus at 35mm; autofocus reaches 0.44x at 50mm. These headline figures apply at different settings. Check the focus mode and zoom position before photographing small objects, and leave room ahead of the lens for light.

Image stabilization is the main extra. It helps counter camera shake at slower handheld shutter speeds. The benefit is greatest at 150mm, where small camera movements show more in the frame. In dim interiors it can hold the ISO down when the subject stays still. The features score on this page is 25 out of 100.

There is no weather sealing, so protect the lens from rain, sea spray and heavy dust. A zoom lock is absent too. Remove loose grit before wiping the glass, and keep both ends capped during transport. Check that the mount is clean before changing lenses.

The optical formula includes two aspherical elements, whose shaped surfaces help correct distortion, where straight edges such as building lines appear curved. That matters at the wide end, where travel scenes often include architecture. One low-dispersion element helps reduce chromatic aberration, the coloured fringes that can appear along high-contrast edges such as branches against bright sky.

Focusing is internal, so barrel length stays unchanged while focus moves. Zooming is a separate action and changes the outer length. Leave clearance in front of the lens when setting the camera on a support or working near an object.