Sony Alpha DSLR- A850 Focusing Screen Replacement
Walter Littlefield and 3 other contributors
Last updated on Nov 3, 2025
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What you need
Tools
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Push in the button next to the lens.
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While holding the button twist the lens counter-clockwise.
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Pull up and remove lens from camera.
Ask FixBot
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Inside toward the top you will find a small slit in the plastic piece.
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Insert a flat head screw driver into the slit and pull down to access the focusing screen.
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Tool used on this step:Tweezers$4.99
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Using tweezers grab the focusing screen on the side by the two tabs that are on it.
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Pull out and remove focusing screen from camera.
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When inserting new screen make sure to orient it where the two tabs are facing towards you with the smaller tab facing up.
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Angle the focusing screen to make installation easier.
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Lay the new focusing screen into the plastic tray.
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Insert screw driver into the slit and push up to close.
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You will hear a click when the plastic tray is back in place.
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When re-installing the lens line up the orange dots that are one both lens and camera.
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Fit lens into place and turn clockwise to secure it back to camera.
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You have now completed a focusing screen replacement.
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One other person completed this guide.
Team
University of Memphis, Team S2-G4, Kim Spring 2018 Member of University of Memphis, Team S2-G4, Kim Spring 2018
UM-KIM-S18S2G4
3 Members
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