Chasing Separation: From a Simple Lens Question to a Shift in Perspective
A pretty straightforward gear question turned into something more layered than expected. The setup was already solid: a Canon EF 85mm f/1.8 USM paired with both the Canon EOS R100 and the Canon EOS R8. The idea was to push subject separation further—get that stronger background blur, that cleaner isolation—by adding a 7Artisans 75mm f/1.4 Lens (Canon RF).
On paper, it made sense. Faster aperture, slightly different focal length, native RF mount. It feels like a natural upgrade path.
But once you actually break it down—and more importantly, once you imagine how it behaves on both bodies—the picture shifts a bit.
The 85mm f/1.8 is one of those lenses that doesn’t need defending. On the R8, it gives you classic portrait rendering: clean subject separation, natural compression, and autofocus that just locks in without hesitation. On the R100, it tightens into roughly a 135mm field of view, which already pushes it into more compressed, more isolated territory. Faces flatten slightly, backgrounds come closer, and separation becomes easier to achieve even at f/1.8. It’s a very efficient lens in both setups, just with slightly different personalities.
The 7Artisans 75mm f/1.4 brings a different energy. Fully manual, no electronic communication, and very much built around rendering rather than precision. Wide open, it gives you that soft, slightly glowing look—highlights bloom, contrast dips a touch, and the background blur feels more painterly than clean. Mounted on the R8, it sits just a bit wider than the 85mm, which reduces compression slightly even though you gain aperture. On the R100, it frames like roughly 120mm, which sounds promising, but again, the physical focal length is still 75mm. That means less compression than the 85mm, even if the depth of field is technically shallower.
So what you end up with is not stronger separation, but a different style of separation. The 85mm isolates cleanly. The 75mm f/1.4 isolates atmospherically. One draws a clear line between subject and background, the other softens that boundary.
At some point, the question shifts from “which aperture is faster” to “what actually creates that strong, cinematic separation.” That’s where the idea of a 135mm lens comes in and changes the direction entirely.
Take something like the Canon EF 135mm f/2L USM, adapted onto RF. On the R8, it lands in a near-perfect portrait range. Compression increases noticeably, backgrounds stack into smooth layers, and even busy environments simplify into soft color and shape. The subject doesn’t just stand out—it feels placed, almost cut out from the scene.
On the R100, the same lens becomes something more extreme, roughly a 216mm field of view. You step back more, your framing becomes tighter, and the effect intensifies. Backgrounds collapse dramatically, and separation becomes almost effortless, even without shooting wide open. It’s less flexible, sure, but when it works, it really works.
And that’s the key realization. The 7Artisans 75mm f/1.4 tries to improve separation through aperture and rendering. The 135mm achieves it through perspective and compression. One is optical character, the other is geometry.
Looking back at the original idea, the 75mm doesn’t really expand the system. It overlaps with the 85mm, just with a different flavor—manual focus, softer rendering, more mood. Interesting, yes, but not transformative. The 135mm, on the other hand, introduces a new way of seeing. It changes how distance behaves, how backgrounds relate to the subject, how the entire frame feels.
A simple pairing starts to make sense. The 85mm f/1.8 remains the reliable, everyday lens—fast, sharp, adaptable across both the R100 and R8. The 135mm becomes the intentional tool, the one you reach for when you want that unmistakable compression and separation that shorter lenses can’t quite replicate.
Somewhere along the way, the focus moves away from aperture numbers and toward spatial rendering. And once you notice that shift, it’s hard to go back to thinking in f-stops alone.