I was struggling to focus my Yashica Mat 124G without a proper focusing aid, so I wanted to make a video of the fairly tedious but simple process of upgrading the stock focusing screen.
https://bright-screen.com/products/
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https://www.shaka1277.com
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00:00 Start
00:19 Introduction
01:37 Upgrading the screen
01:55 Removing the focusing hood
02:45 Removing the old screen
04:14 Installing the new screen
05:23 Reinstalling the focusing hood
06:03 Checking focus
06:36 Shimming to adjust focus
07:10 Conclusion