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A roll-off at the brightest tones allows for smoother transitions from bright to clipped pixels, but also comes at the cost of tones being 'pushed' into one another: if you brighten one section of a cloud, you run the risk of it becoming just as bright as the adjacent section of cloud lit just a bit brighter by the sun. That's because the camera is trying to show you what the camera JPEG will look like.Īnd that means somewhat darkened shadows, and brightened light tones. This same curve is applied to the standard EVF preview on most cameras (the exact shape will differ, and will also be affected by any dynamic range compensation or gamma modes). Below you'll see - in red - an S-shaped gamma curve applied by a typical JPEG processing engine to boost global contrast. What really sets the OVF Simulation Mode apart from a standard EVF experience then is the gamma curve, or tone curve, employed to translate scene brightness to display brightness. Meaning, usually even with exposure simulation, you get a reasonable preview of your scene, as long as you don't have dramatic exposure compensation values dialed in. It's comfortingly familiar to anyone coming from a DSLR, and not totally unlike the EVF experience in Program AE modes, where autoexposure is constantly adjusting to match the scene. In OVF Simulation Mode, the camera constantly - and automatically - adjusts the overall brightness of the scene, so you have a usable preview.

Display appearance will differ from your shots.' The description Canon provides when enabling 'OVF simulation view assist' in the menus is telling: 'Natural view at viewfinder or screen display when photo shooting.

Exposure simulation is disabled, with the preview based instead on what the camera considers a reasonable representation of the scene.With OVF Simulation on, the image through EVF appears closer to what you might see through an optical finder, due to a few reasons: Also, keep in mind that the difference is more dramatic in person, as the iPhone capture, tone-mapped to the standard dynamic range output you're viewing, necessarily limits comparison. It may not look like much at first, but in practice, the distinction can be very useful. This is how the electronic viewfinder on the EOS R3 looks with OVF Simulation Mode on vs. Standard EVF previews on most cameras continue to be linked to the outdated rendering intent of camera JPEGs, with a limited dynamic range and contrasty processing designed decades ago for print and CRT displays. let's make use of it!'Ĭanon did what arguably the first manufacturer to put a 1000-nit or greater capable OLED viewfinder in its camera should've done: gone back to the drawing board and said: 'we have a high dynamic range display that can better represent the world the photographer is trying to capture: let's make use of it!'Įssentially, OVF Simulation Mode is a tool that exploits the improved dynamic range offered by modern OLED displays to allow photographers to better visualize the scene they're about to shoot. Canon essentially said 'We have an HDR display that can better represent the world. Almost paradoxically, OVF Simulation mode, a new feature on the recently announced EOS R3, delivers a more advanced, more naturalistic viewfinder experience than previous mirrorless cameras as a result of Canon trying to make users of an older technology (optical finder) feel more at home. Canon is the first company we've seen to take advantage of the greater dynamic range of the latest OLED viewfinders.