Another Canon RF 90mm f/2.8 IS STM Macro Design Has Appeared

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.

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.

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.