It's great to read someone's opinion based on usage of BOTH the Katz eye, and another cheaper brand... (noting the service difference also).
I'm tempted to use an old Pentax zoom lens for a wedding (I'm not the prime shooter), and my only concern was not the resolution/sharpness, but the ability to focus quickly to get the shot before the subject moves or changes expression.
This discussion seems to make me think old manual lens are now a more viable solution in this scenario.
I realise back in the day, people only had manual focus, but back then I'd imagine people were also more at one with the technique. If it's something I only try every now and then, I'd need all the help I could get.
Now my mind is considering what detrimental affect the alternate screen has on using my auto focus lens usage... are the red focus indicators kinda blurred by the circle assist aids? Once installed, am I gonna be cursing whilst using AF lenses?
These replacement screens obviously seem great for manual focus, but what's the full story?