Their main objective is to boost the quality of photos and allow users to get the most out of their photography experience. In addition, lens hoods can offer some degree of physical protection for the lens due to the hood extending farther than the lens itself.Gobe is an Australian brand that prides itself in creating camera lens filters and other pieces of equipment. Lens hoods are often designed to fit onto the matching lens facing either forward, for normal use, or backwards, so that the hood may be stored with the lens without occupying much additional space. For wide angle lenses, the length of the hood cannot be as long as those for telephoto lenses, as a longer hood would enter the wider field of view of the lens. Lens hoods are more prominent in long focus lenses because they have a smaller viewing angle than that of wide-angle lenses. This allows the lens hood to block stray light with the higher portions of the lens hood, while allowing more light into the corners of the image through the lowered portions of the hood. The geometry of the lens hood can vary from a plain cylindrical or conical section to a more complex shape, sometimes called a petal, tulip, or flower hood. This stray light often comes from very bright light sources, such as the sun, bright studio lights, or a bright white background. Flare occurs when stray light strikes the front element of a lens and then bounces around within the lens. Olympus OM E.Zuiko Auto-T 135mm F/2.8 Ī lens hood or lens shade is a device used on the end of a lens to block the sun or other light source in order to prevent glare and lens flare. ZEISS Milvus Apo Sonnar T* 135mm F/2 ZE / ZF.2
Samyang 135mm F/2 ED UMC (Bower, Rokinon, Walimex Pro) Minolta MC Tele Rokkor(-X) 135mm F/2.8 Ĭarl Zeiss Classic Apo-Sonnar T* 135mm F/2 ZE / ZF.2 The result is a very high performance, fast, 135mm f2.3 lens that yields a 1:4.5 reproduction ratio at its close focusing position of 89cm from the focal plane.Ĭarl Zeiss C/Y Planar T* 135mm F/2 Ĭarl Zeiss C/Y Sonnar T* 135mm F/2.8 Ĭarl Zeiss C/Y Planar T* 135mm F/2 “CONTAX 60 Years” Īsahi Super-Multi-Coated Takumar 120mm F/2.8 Īsahi Super-Multi-Coated Takumar 135mm F/2.5 Īuto Mamiya/Sekor SX 135mm F/2.8 įuji Photo Film EBC Fujinon At the same time, this design reduces the length of travel required for a specific focus distance and permits closer focusing with greater mechanical reliability. The result of this patented design is consistent image sharpness throughout the format from center to edge at all focusing distances. Light transmission through the center is relatively unaffected by focusing changes and is thus relatively unaffected by the rear compensating element. These aberrations are most pronounced in the corners of the format. Vivitar designers off-set this change by introducing a stationary rear compensation lens to correct aberrations produced as the lens moves relative to the film. Image quality changes as a lens changes its position relative to the film plane. In both cases, however, performance was poor between very close focusing distances and moderate distances. In the past this problem was avoided by designing lenses that functioned optimally at infinity and by designing other lenses specifically for close-up and macro photography.
In traditional medium-telephoto lens design, optical aberrations become increasingly apparent as the lens approaches close focus.
BOWER VS VIVITAR LENS FILTERS SERIES
Vivitar Series 1 booklet (August 1976).*) Sources of data: Manufacturer's technical data Vivitar Series 1 135mm 1:2.3 AUTO TELEPHOTO VMC Vivitar Series 1 135mm 1:2.3 AUTO TELEPHOTO