<p >Hi all,</p> <p > </p> <p >I've been dabbling back into film photography. I got a couple of those manual focus Rokinon/Samyang lenses, which I like. </p> <p >I’m using an FM3A, because I wanted a split-screen micro-prism to focus them with.</p> <p > </p> <p >I've thought of getting a second FM3A, or an FE2. </p> <p >But then I noticed that a company sells a <strong>split-prism focusing screen for the F100</strong>. (It's actually a modified K3.)</p> <p >If I got myself an F100 with the 3rd party screen, I'd be all set for both AF and MF lenses.</p> <p > </p> <p >My question is: If I switch out the F100’s default focusing screen, will I be losing anything important? Like, pertaining to auto-focus? Will the chosen focus point still light up? </p> <p >(FWIW, I've always auto-focused using the center focusing point, then recomposing as necessary.)</p> <p > </p> <p >Thanks in advance!</p> <p >- pbass</p>