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| p.1 #2 · Canon 5D mk II focus screen: EG-S or Brightscreen #5 large split image microprism? |
I also have a Eg-S on a 5Dii, and it helps a bit over the stock screen. Another option from the Brightscreen is a Canon Ec-b split screen, which has a smaller spit prism area, and is way cheaper, so its worth a try. The split prisim will imact your exposure for sure, but the smaller area will be less.
Since I normally shoot on a tripod I always use Live View 5-10X, which I find immensely more reliable than a viewfinder. Live View is strongly recommended, and the magnified area can be anywere in the image. Just remember the exposure will also be set from the magnify rectangle location.
For handheld, another option is live view "Live" or contrast detect AF. Although slower than phase detect AF, it it usually no slower than manual focus and the focus point can be moved anywhere within the image.