I’ve come across a problem with the Sinar binocular reflex housing that I’m wondering if anyone has any experience with.
I’ve just started using one and discovered that what I shoot with it on isn’t sharp. After comparing it with the focus obtained from a loupe on the ground glass, it appears the housing impairs the focus by -3, based on the Sinar rotating dial scale. So if the focus obtained through the loupe on the ground glass is set to 0, then the focus for the reflex housing comes in at -3 on the scale. The difference appears to be even across different focal lengths of lenses and differing subject to camera lengths. And the housing impairs focus in the same way when the magnifying lenses are flipped up or down. It's possible the explanation could involve the mirror, but this housing appears to be in good original shape.
I’m wondering if anyone has experienced this problem and perhaps found a way to solve it.
Cheers,
Vic
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