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Forum: Troubleshooting and Beginner Help
04-24-2011, 09:47 PM
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The Trevor screen was manufactured with the tab on the opposite side than the Pentax K-x screen. Don't think of it as upside down.
No matter the tab location, the matte side of the screen always faces the penta-prism/mirror. This is the focus surface.
The Fresnel always faces the lens. The Fresnel concentrates the light from the lens on the matte surface making the image brighter.
The shims go between the screen and the penta-prism. This is how the factory calibrates the focus screen to the auto focus system. If the factory correctly calibrated the original screen, there should be no need for additional shims. This can probably be fine tuned. The matte side will always be in the same plane against the shims, no matter how thick the focus screen.
The eyepeice diopter should be adjusted to give the best definition of the focus screen. Point the camera at clear sky or unfocused on a blank wall. Slide the diopter to give you the best view of the scratches from installing your new screen. This is most likely the matte side. This is also the same way you focus the crosshairs on a rifle scope.
My Travor double diagonal screen came with stains/glue residue from the protective tape.:mad: It was not removeable with careful scrubbing with dish soap and an artist brush.:(
The Travor screen split prism is about 138 pixels high of center. About 5%
Still the screen is 287% better than the OEM screen.:)
owner of 2 auto focus lenses AND
35 manual lenses(at last count):D
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