日本的改裝經驗有沒有提到會暗1/2 stop 這部份?

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The 20% increase in viewfinder magnification is definitely noticable and the whole viewfinder remains visible. However, you should be careful to keep your eye well centered in front of the eyepiece or you'll see some nasty chromatic aberrations. Also, due to the increase in magnification, the viewfinder will be approx. 1/2 stop darker. Anyway, for me the advantages have outweighed the disadvatages and the magnifier has not left my camera since I attached it.