If you don't like Fresnel lenses as a ground glass viewing aid, then this thread is not for you. I don't want to argue about whether one prefers them. We're adults and can make our own informed choices. I like to be able to see the whole composition easily, and so I prefer them. The method is simple. Buy a rigid Fresnel 2x page magnifier. I bought mine at Staples. Cut it down on tablesaw with the center of the Fresnel at the center of the ground glass. Install on the back of the ground glass with the ridges on the outside. Focus your loupe on the grain of the ground glass. Enjoy. For me, they work best with moderate wide angles, which I use the most. I've tried 3x Fresnels, and for my focal length lenses they don't work as well.
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