What is a paraxial camera? What kind of structure is it?

Paraxial camera, as its name implies, is that the image seen in the viewfinder is different from the image finally refracted on the film through the lens. Because its framing system is independent and has a certain parallax, users need to adapt through a certain period of time! In the camera development history of 100 years, the paraxial axis is undoubtedly a very important link. It has a wide variety and different structures, and has its own profound cultural characteristics and photographic characteristics! Therefore, it is necessary for everyone to get to know this familiar stranger!

(a) background of paraxial camera

Not to mention too early, but in the early days of the camera industry, hand-made camera products were mainly influenced by painted black boxes, and products with wool screen coaxial viewing mode occupied an important position.

But this way of framing is too inconvenient. First, in the early stage of the development of photosensitive materials, sufficient lighting environment is needed when taking pictures; Second, the screen shot is easily disturbed by external stray light. This restriction has inspired a revolution in viewfinder, and paraxial viewfinder is a revolutionary product born in response to the times!

There are several types of early paraxial frame structures. The simplest one is called frame viewfinder, which can be installed on any coaxial camera as an additional viewfinder. Because the production is simple, the framing accuracy is basically acceptable when shooting scenes at a certain distance, so it is widely used! For example, 1860 Chambre Automatique produced in France. . . . . . . . . . . .

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The biggest difference is that the lens (internal optical element) on the side shaft can move! And SLR can't!