Comparison: RF 85mm f/1.2L USM Vs. RF 85mm f/1.2L USM DS

Durning the announcement of Canon RF 85mm f/1.2L USM lens (B&H Photo Video/Adorama/Amazon) several days ago, Canon USA also posted a article about RF 85mm f/1.2L USM lens compare to RF 85mm f/1.2L USM DS lens. This “DS” version lens will be announced in later 2019.

This “DS” stands for Defocus Smoothing. It is a fixed focal length, 85mm lens which takes the idea of beautiful, soft backgrounds, or “bokeh,” and pushes the concept even further.

Defocus Smoothing is a coating technology, similar in some ways to the general concept of apodization technology, which has been a part of optical design in the lens industry for some time. In the case of the RF 85mm F1.2 L DS lens, a special optical coating is added to two lens elements, which progressively smooths the edges of out-of-focus areas (compared to the RF 85mm F1.2 L without DS technology). Simply stated, the DS lens gives even smoother “bokeh” and rendering of out-of-focus highlights, particularly when it’s used at or near its maximum f/1.2 aperture. The edges of out-of-focus highlights with the DS lens, in particular, are smoother — this is the biggest difference between these two 85mm f/1.2 lenses.

Because DS coating is indeed a coating technology, it does not rely on added optical elements or “soft focus” optics to achieve its results. Accordingly, the DS lens’ size and weight are essentially the same as with the RF 85mm F1.2 L USM lens, along with its outer appearance, and basic optical performance. The DS lens uses the same general optical design as the conventional RF 85mm F1.2 L; the major distinction are the Defocus Smoothing coatings used on two lens elements.


The information here is based on early data from Canon engineers, provided well before the actual public announcement of the DS lens, which will be made later in 2019. So, consider the following points as preliminary information, intended to help critical users decide whether they should consider the RF 85mm F1.2 L lens, or wait for the DS version to appear on dealer shelves during the 2nd half of 2019.

  • Reduced light transmittance: 
    The Defocus Smoothing coatings in the 85mm F1.2 L DS lens will reduce actual light transmission by up to 1.5 stops, when the lens is at its widest aperture.
  • Defocus Smoothing effect is aperture-dependent:
    The visual impact of softer-edged, out-of-focus highlights, is at its maximum when the DS lens is shot wide-open. The visual impact of Defocus Smoothing diminishes, vs. the RF 85mm F1.2 L lens, as the DS lens’ aperture is stopped-down, and essentially disappears if the lens is stopped-down several stops from wide-open.
  • Depth-of-field is rendered differently
    At wider lens apertures where the Defocus Smoothing effect is visible, for technical reasons, depth-of-field will appear deeper in shots taken with the DS lens, vs. identical shots taken with the RF 85mm F1.2 L USM lens.

Unlike some special, portrait-oriented lenses we’ve seen in the photo industry over the years, the Canon DS lens is absolutely not a Soft Focus lens. Soft Focus lenses, historically, used optical methods to scatter light and soften the entire image, so that an in-focus subject — like a person’s face — appeared softer, without post-production retouching.

With the RF 85mm F1.2L USM DS lens, the in-focus part of the image remains tack-sharp, whether it’s centered or off-center in the frame. Canon’s Defocus Smoothing only impacts the appearance of out-of-focus elements, foreground and background.

A few other important, early notes on Canon’s Defocus Smoothing and the RF 85mm F1.2 L USM DS lens:

  • Defocus Smoothing cannot be turned on or off — it’s always active, when shots are taken at sufficiently wide lens apertures. The Defocus Smoothing effect is at its maximum when images or video are recorded with the lens at its widest f/1.2 aperture.
  • Autofocus always remains available with the RF 85mm DS lens
  • Pricing has not been announced (as of the date of this article), but Canon USA anticipates that the DS version of the 85mm f/1.2 lens will retail at a higher price than the traditional RF 85mm F1.2 L USM lens.

The upcoming RF 85mm F1.2 L USM DS lens, with Defocus Smoothing, provides photographers with a powerful new choice — a tack-sharp 85mm lens which further enhances the characteristic soft backgrounds and foregrounds users expect with a fast, portrait-length telephoto.

An obvious application for the DS version is outdoor portraits, including areas like fashion — where the 1.5 stop light loss would be much less of a problem, and the ability to get super-soft “bokeh” can set a photographers’ images apart from those of other shooters.

Without Defocus Smoothing, the RF 85mm F1.2 L USM provides the user with an excellent low-light lens, with unhindered light-gathering capability. Clearly, this would be the choice for users who frequently work in dim available-light situations. At wide lens apertures, it can certainly throw backgrounds beautifully out of focus. And, for users who truly want to leverage the shallow depth-of-field that’s possible with nearby subjects at f/1.2, the conventional lens will deliver more of that look at wider apertures than the DS version.


Canon EOS R system users will be graced by not one, but two high-performance, 85mm lenses in 2019. The tantalizing potential of an 85mm F1.2 L-series lens, giving the mirrorless EOS R or RP cameras the best optical performance to date among autofocus, 85mm Canon-brand lenses,* makes the traditional RF 85mm F1.2 L USM a hard lens to resist if portraits or low-light event coverage are a big part of a photographer’s game plan. As just mentioned, even without DS technology, it can produce beautiful background “bokeh” in portraits and with other subjects.

On the other hand, the Defocus Smoothing version brings even more of that beautiful, soft look to out-of-focus areas, when you can shoot at maximum aperture. If the final look of your images is a big part of your visual message, and especially if your work is more outdoor- or studio-related than in dim, available light, the RF 85mm F1.2 L USM DS may be just the ticket for your next short-telephoto lens.

Consider the potential 1.5-stop light loss with the DS version, at f/1.2, as well. If you have been comfortable in available-light situations working at apertures like f/2.8 or f/2, the light loss you experience with the RF 85mm F1.2 L USM DS will result in similar exposures, when you work with the lens wide-open.

Canon USA will have more information about the upcoming DS version, closer to the time of its actual public introduction, during the 2nd half of 2019. The conventional version of the RF 85mm F1.2 L USM, without the Defocus Smoothing technology, is expected to be available at dealers in Spring of 2019.

via: CanonUSA