Penta prism
Penta prism, correctly described as a roof-type pentagonal prism. A pentagonal prism with a roof-type reflective surface with a 90° surface of incident light and reflected light. Mounted on the head-up viewfinder of a single-lens reflex camera, the image on the focusing glass looks like an upright image that is reversed from side to side, forming an upright image in a positive direction. The biggest reason why a 35mm single-lens reflex camera can be used as a normal camera is because it is equipped with a pentagonal prism.Dove prism
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Material |
H-K9L (Schott BK7)/Fused Silica/glass |
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Dimension Tolerance |
±0.1mm |
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Surface Accuracy |
L/4@632.8nm |
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Surface Quality |
40-20 |
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Angular Tolerance |
±3 arc min |
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Clear Aperture |
>90% |
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Bevelling |
<0.2 *45 |
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Coating |
Custom Design |
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No. |
A=C(mm) |
B(mm) |
D(mm) |
SQ |
Flatness |
Angular Tolerance |
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HC41Q990 |
5.00 |
21.21 |
7.07 |
40-20 |
L/4 |
3' |
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HC41Q991 |
10.00 |
42.42 |
14.14 |
40-20 |
L/4 |
3' |
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HC41Q992 |
15.00 |
63.63 |
21.21 |
40-20 |
L/4 |
3' |
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HC41Q993 |
30.00 |
127.26 |
42.42 |
40-20 |
L/4 |
3' |
