Matówka standardowa w 5D a ostrzenie jasnymi szkłami i podgląd GO
Witam was ponownie z dziwnym problemem - zagwozdką.
Ponownie wchodząc w Canona i wybierając sprzęt (który dzięki wam i forum już zamawiam) natrafiłem na test 85mm f/1,2 USM L mark II na 5D (który właśnie zamawiam)
Generalnie autor testu pisze, że matówki standardowe w Canonie pozwalają obserwować GO jedynie do f.2,5 co powoduje:
1. Że w wizjerze jest tak samo jasno gdy mamy założony obiektyw o świetle 2,8 jak gdy podpinamy 1,2
2. Nie da się ostrzyć na przysłonach większych (np 1,2) w punkt, ponieważ widzimy w wizjerze GO ok f2,5
Czy to prawda? Czy potwierdzają to wasze doświadczenia choćby z 50mm 1,4 ??
Czy trzeba więc nabyć Ee-S screen by widzieć jasność i GO f1,2?
Matówka ta jest jednak podobno b ciemna, więc np z 24-70 f2,8 zrobi mi się ciemno w wizjerze?
KenRockwell.com
Cytat:
Oddly, these modern screens get no brighter when you're using a lens faster than f/2.8. Try it: put on an f/1.8 or other fast fixed lens and flick the depth of field button. You'll see no change in anything until you stop down to about f/2.5!
Still think I'm making it up? Look through the front of your fast lens at the focus screen. It's black outside the area of the lens that corresponds to f/2.5!
Standard focus screens see nothing coming from the lens at annular angles faster than f/2.5.
If you're using a fast lens and want to see the real depth of field or want to focus well manually at large apertures, you need a different screen.
The standard screen with which the 5D ships is the Ee-A. The same screen with a grid is the Ee-D.
For optimum use for manual focusing or seeing depth of field with the 5D and fast lenses, use the Ee-S screen. Sadly of course this screen is great for your fast glass, but dim with slow lenses. Digital hasn't fixed this yet, sorry - you might wind up having to swap screens.
I have no idea how to change screens; my 5D manual (page 158) says see the instructions that come with the screen. It was easy with Nikon cameras; I presume it ought to be as easy with the 5D.
Use the standard screens (Ee-A and Ee-D) with lenses of f/2.8 and slower.
Use the Ee-S screen with lenses of f/2.8 and faster.
Since they differ in brightness, the 5D's meter needs to know what screen you're using. You se this in Custom Function 00.
Cytat:
You can't manual focus accurately enough for f/1.2 because the standard focus screens on the Canon 5D and others only see at a maximum of f/2.5 - you need a special focus screen for precise manual focus. I'm not kidding: flick the field preview and you won't see any change stopping down to f/2.5. That's the way modern laser-etched finder screens are made to make dim zooms look brighter. You'll do OK for journalism, so long as you set focus to the middle of what looks sharp.
