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In this way, an EVF is especially useful for relatively inexperienced photographers, because it enables you to see the effects of camera settings at the shooting stage, not just assess them afterwards. For many, it makes photography more intuitive.

On the other hand, because the image you see in an EVF has to be processed before it can be displayed, all EVFs suffer from some degree of lag. Although the latest mirrorless cameras such as the EOS R5 have EVFs with a refresh rate of 120fps and the lag is only a matter of milliseconds, this can still matter if you"re shooting fast-moving action and split-second timing is critical. As technologies continue to develop, the lag is likely to get shorter and shorter, but an OVF works at the speed of light, which means in effect no lag at all. For this reason, many photographers shooting sports, wildlife or other subjects involving fast action still prefer a DSLR.

In addition, when you"re using an EVF you"re actually looking at a small screen, and even though this has a very high refresh rate, an OVF can be more comfortable over a long period of usage. This means that if you"re shooting wildlife or sports where you have to keep your eye to the viewfinder for a very long time waiting for the action to happen, an OVF could be preferable.