We reported recently that Canon would be releasing an RF 90mm f/2.8 IS STM Macro lens, it will not be an L lens, as the RF 100mm f/2.8L IS USM Macro already exists. We have also seen designs for a 90mm macro lens from a previous patent.

This latest patent is similar to the previous patent. The goal is to shrink the size of a macro lens to keep it as short and light as possible.

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macro lens layout and focus movement Diagram of five lens groups from subject side to sensor side: L1 positive fixed, L2 positive moves toward the subject, L3 positive fixed with the aperture, L4 negative moves toward the sensor, L5 negative fixed. ← Subject side Sensor side → L1 Positive Fixed L2 Positive Focus L3 Positive Fixed L4 Negative Focus L5 Negative Fixed• fixed toward subject • fixed aperture inside toward sensor • fixed Positive power (converging) Negative power (diverging) Thick outline = moves to focus

As you can see, the focusing groups have opposite powers. The ideal is to move the focusing groups away from and toward each other together. This keeps image quality as high as possible and offsets issues like color fringing and blur.

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1 wireframe tear-away: five-group macro lens Wireframe cross-section of Example 1 drawn from the patent prescription at infinity focus. L1 positive fixed, L2 positive focus group, L3 positive fixed with aperture stop, L4 negative focus group, L5 negative fixed. Part of the upper barrel wall is torn away to reveal the glass. Axial rays in blue and full-field rays in coral. Example 1 · 87.3mm f/2.92 Wireframe tear-away · shown at infinity focus ← Subject side Sensor side → L1 L2 L3 L4 L5 aperture sensor Focus travel, infinity → 1:1 20.0mm toward subject L2 8.4mm toward sensor L4 Total length 120.00mm Back focus 14.62mm Positive group Negative group Axial rays Rays to sensor corner Radii, thicknesses and glass are from the patent. Diameters and housing are ray-trace estimates.

We expect the Canon RF 90mm f/2.8 IS STM Macro to be announced in the next month or so—late October or early November seems to be the most likely, but we do not have a confirmed announcement date yet.

We now have three different designs for the RF 90 macro, so we think it's a safe bet that we're going to see something very close to what is shown here.