I have a 6D with a Eg-S high precision screen . It is great when needing to manual focus fast lenses, but when using autofocus it doesn't offer too much advantage over a typical focusing screen. Yeah you can get a better idea of what wide open looks like on a fast lens, but experience will generally inform you what aperture to set anyway in a given situation. As I don't believe Canon has any manual EF lenses in production faster than f/2.8 they probably considered it a safe bet to eliminate the swapping feature. They don't want you to buy competitor manual only lenses anyway.I agree completely, although to be fair to the current group of users, back then you had split prisms etc. that made focusing pretty equal to the electronic focus aides of today. It's frustrating that you can no longer change focusing screens on modern DSLRs
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