Fitted With Lens: To fill their needs, manufacturers began to introduce in the 1890s a new kind of finder: a second Camera mounted on top of the Camera with which the exposure was made. It was fitted with lens with a lens of exactly the same focal length of the taking lens; both were focused together. On the top of the finder-camera was a ground glass the size of the negative. Within was a mirror, fixed at 45° to the lens axis, which reflected the image upwards, like the eighteenth-century Camera obscura. A collapsible hood shaded the ground glass so that the image could be seen clearly.
Leitz i Wetzlar, Germany. In 1924 the company felt that tt Camera had sales possibilities, and that year the first Lek was put on the market. It was fitted with lens with a lens of 50mi focal length with an aperture of //3.5. The first improvi ment was to make the lens removable and to offer thphotographer a choice of lenses of varying focal lengths and apertures that could be readily interchanged while shooting.
However, although a long focal length lens is mandatory, it need not be expensive. The utmost of critical sharpness in a portrait lens is not necessary, or even desired, since considerable diffusion can be tolerated in portrait negatives. Your lens needn't be in a shutter for strictly studio portraits, either. A lens in barrel is perfectly satisfactory, since you can provide yourself with a simple Packard shutter to use behind the lens. Many portrait men actually prefer the Packard to the more costly between-the-lens shutters.
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Photography
