What do camera SLR and double reflex mean?

Single lens viewfinder camera

Traditional double opposition

Double-lens viewfinder camera

In traditional cameras, one is used for framing and the other is used for imaging. But lenses are generally not replaceable,

If the two lenses are not replaced together, the parallax between the viewfinder lens and the imaging lens will be great.

When taking pictures, the photographer looks down at the double-reflex camera.

Digital double opposition

Kodak digital double reverse lens has both framing and imaging functions, in fact, it is to integrate two single lenses.

Among them, a wide-angle lens with a fixed focal length (23 mm),

The other lens is a medium telephoto lens (39- 1 17 mm) with a variable focal length of 3 times.

Combined with wide-angle focal length, the change of total focal length is close to 5 times that of optical zoom.

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