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Questions tagged [pentaprism]

Five-sided block of glass with mirrored surfaces used to reflect light from an SLR's mirror to the viewfinder's focusing screen. Heavier and more expensive than a pentamirror, but with better light transmission.

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Why a pentaprism and not a simple flat mirror? [duplicate]

I don't understand why pentaprisms are needed to reflect light from the image up through the viewfinder. When I read why it is used, the explanation seems to indicate that it ensures the light coming ...
John Kip's user avatar
4 votes
5 answers

Can viewfinder type make an appreciable difference in manual focus?

I have a few old vintage lenses that I love to shoot with on my Canon T3. The obvious disadvantage is the challenge of getting sharply focuses images while focusing manually. I have great vision, but ...
Scorb's user avatar
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1 vote
1 answer

Fit LCD to prism based viewfinder

This is a potentially a pointless endeavour, but I'm looking into trying to assemble a mirrorless camera using a CCD sensor mounted to the back of an M42 lens using a series of converters. Primarily, ...
Alex's user avatar
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2 votes
3 answers

Which is better to use : Mirror or totally reflecting prism?

I'm designing a stereoscopic system to capture 2 images at the same time one for the right eye and one for the left eye. To take a photo through a reflecting system, which one is the best choice of ...
Lavender's user avatar
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14 votes
1 answer

What does the pentaprism/pentamirror do?

In an SLR, the light bouncing off the mirror goes through a pentamirror or pentaprism before being reflected to the viewfinder. However, it seems to me that it would be possible to project an image to ...
Chinmay Kanchi's user avatar