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Claude Lorrain mirror in shark skin case. A Claude glass (or black mirror) is a small mirror, slightly convex in shape, with its surface tinted a dark colour. Bound up like a pocket-book or in a carrying case, Claude glasses were used by artists, travelers and connoisseurs of landscape and landscape painting.
The metal used determines the reflection characteristics of the mirror; aluminium is the cheapest and most common coating, and yields a reflectivity of around 88%-92% over the visible spectrum. More expensive is silver , which has a reflectivity of 95%-99% even into the far infrared , but suffers from decreasing reflectivity (<90%) in the blue ...
The Contaflex series is a family of 35mm Single-lens reflex cameras (SLR) equipped with a leaf shutter, produced by Zeiss Ikon in the 1950s and 1960s. The name was first used by Zeiss Ikon in 1935 for a 35mm Twin-lens reflex camera, the Contaflex TLR; for the earlier TLR, the -flex suffix referred to the integral reflex mirror for the viewfinder.
The mirror box also prevents lenses with deeply recessed rear elements from being mounted close to the film or sensor unless the camera has a mirror lockup feature; this means that simple designs for wide angle lenses cannot be used. Instead, larger and more complex retrofocus designs are required.
"Full-frame E-mount" series for 35mm full-frame image format. G "Gold" series, Sony's line-up of high-grade lenses. GM "Gold Master" series, Sony's line-up of ultra high-grade lenses. LE "Light Edition", lenses designed to be particularly light. OSS "Optical SteadyShot", lenses with optical image stabilization. PZ
Zerodur has both an amorphous (vitreous) component and a crystalline component. Its most important properties [21] are: . The material exhibits a particularly low thermal expansion, with a mean value of 0 ± 0.007×10 −6 K −1 within the temperature range of 0 to 50 °C.
The history of the single-lens reflex camera (SLR) begins with the use of a reflex mirror in a camera obscura described in 1676, but it took a long time for the design to succeed for photographic cameras. The first patent was granted in 1861, and the first cameras were produced in 1884, but while elegantly simple in concept, they were very ...
The T and T2 have a fixed 38 mm wide-angle Sonnar lens (5 elements in 4 groups), while the T3 uses a redesigned 35mm Sonnar lens (6 elements in 5 groups). The T-VS and T-VS II use a 28–56 mm Vario-Sonnar lens (where the "VS" in T-VS comes from), while the T-VS III has a 30–60 mm Vario-Sonnar lens. All analog T and T-VS cameras use 35 mm film.