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Step 4Modify the split-image focusing screen to fit in EOS-300!
Now is the hardest task. Your split-image focusing screen may be of different size than the original EOS-300 focusing screen. Differences in thickness can be solved by adding spacers, or by reversing the focusing screen. For the length/width differences, you have to cut the screen to the size of original one.
In my case, the length was OK, I had to trim two sides to fit the width. I used an X-Acto knife to mark it deeply on two sides, then I used pliers to snap the edge off. Then I sanded the sides in water to smooth the edges. Pay attention to not damaging the split-image prisms at the center. And don't scratch the focusing screen! When you are finished, wash them with some lens cleaner solution so that you won't have any grease/finger prints on them. This is not easy actually... :-(
In my case, the length was OK, I had to trim two sides to fit the width. I used an X-Acto knife to mark it deeply on two sides, then I used pliers to snap the edge off. Then I sanded the sides in water to smooth the edges. Pay attention to not damaging the split-image prisms at the center. And don't scratch the focusing screen! When you are finished, wash them with some lens cleaner solution so that you won't have any grease/finger prints on them. This is not easy actually... :-(
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