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RF 10-20MM F/4L IS STM: Canon’s Widest RF Zoom Lens Announced



Canon continues to pump out quality glass for its mirrorless range of camera bodies, today releasing its widest RF zoom to date.

Canon Australia has announced the RF 10-20mm f/4L IS STM, boosting the L-series range for photo and video professionals. The angle of view opens up to a massive 130° and the results speak for themselves. The RF 10-20mm f/4L IS STM is a rectilinear lens so lines are straight, even at the edges.

This is definitely not a fisheye lens.

Yes it is f/4, but with 5-stops of built-in stabilisation and autofocus I think it’s a winner. In fact, the IS goes up to 6-stops when combined with the in-body stabilisation. I think everyone would love a faster lens but at least it’s f/4 throughout the zoom range. This helps with consistent exposure at every zoom setting. Also, optical coatings minimise ghosting and flare which can be common with ultra-wide shots.

The video below from Canon USA gives you a great idea of the lens’ capability.

Canon USA intros the RF 10-20mm f/4L IS STM

It’s also pretty small and light for a lens of this quality and complexity. Weighing just 570g, the RF 10-20mm f/4L IS STM is ideal for travel.

Canon makes the point that it’s less than half the weight (610g lighter) and 2cm smaller in width and length than the EF 11-24mm f/4L USM – in fact, the new lens paired with an EOS R8 weighs less than the older EF lens alone.


  • The aspherical, Super UD, and UD lens elements (including one Aspherical UD element)
    which help to achieve high image quality appropriate for an L lens
  • Highly durable dust and water resistant qualities, to withstand rigorous conditions faced by
  • SWC (on 2 lens surfaces) and ASC (Air Sphere Coating) reducing ghosting caused by light
    sources within the image, a phenomenon often seen in wide-angle lenses
  • First L series lens to feature STM motor and full-time manual focus capability, thanks to
    compact lightweight focus group
RF 10-20mm f/4L IS STM will open a whole new range of shots for videographers too


RF 10-20mm f/4L IS STM
Focal Length10-20mm
Maximum Aperturef/4
Minimum Focusing Distance0.25m
Maximum Magnification0.12x (at 20mm)
Lens Construction16 elements in 12 groups
FilterRear gelatinfilter holder
Aperture Blades9
Aspheric Lenses3
Image Stabilisation5.0 stops (in-lens Optical IS), Up to 6.0 stops (with IBIS coordinated control)
Focus Drive SystemSTM
DimensionsApprox. 112mm (length), 83.7mm (diameter)
WeightApprox. 570g
Lens CapCAP10-20 (included)
Lens CaseLP1210 (included)


The RF 10-20mm f/4L IS STM lens is priced at $4,199 RRP (including GST). Available in Australia from this month, the lens will be supported by Canon Australia’s 5-year warranty when purchased from an authorised Canon Australia reseller.

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