Matówki w 5d

[Magus]

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

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.

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.