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X-700 no focusing screen

Started Apr 11, 2018 | Discussions thread
neilt3
neilt3 Veteran Member • Posts: 3,008
Re: X-700 no focusing screen

paul_kew wrote:

Just wondering, how thick is the screen and is the camera set up so that if the image on the underside of the screen is in focus, does trying to focus on the base of the prism instead mean the film image will be out of focus?

The base of the pentaprism is clear glass .

There is nothing to project the image onto to see .

The focus screen has a Matt surface to project it onto so you can see it .

Hence why their sometimes referred to as ground glass .

And yes , because the screen is a mm or so thick , if the prism was where the image was projected , it would be well out .

The frame that holds the focus screen in has to be clipped back correctly or the focus will be off , and that's with the screen in place !

Imagine you had a slide projector and tried to view the images on a piece of clear glass rather than a projection screen , you wouldn't see a lot .

Likewise some focus screens are better than others.

Minolta was one of the best at the time .

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