![leitz wetzlar germany 250mm leitz wetzlar germany 250mm](https://i.ebayimg.com/images/g/O6AAAOSwJ~hdszHV/s-l300.jpg)
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.
![leitz wetzlar germany 250mm leitz wetzlar germany 250mm](https://cdn.shoplightspeed.com/shops/628912/files/38986063/262x276x2/leica-leica-leitz-wetzlar-viooh-leica-universal-vi.jpg)
The diaphragm-control ring turns smoothly and accurate.
![leitz wetzlar germany 250mm leitz wetzlar germany 250mm](https://i.ebayimg.com/images/g/WH4AAOSwL81iAERd/s-l64.jpg)
Glass in ideal condition: clean, no scratches, no fungus. 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. Leica 90mm f2 Leitz Wetzlar Elmarit-R Lens 90/2 Germany S/N 2463219 For his age lens in excellent condition. 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. This projection lens is in very good condition and is clear. 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. Originally produced in the 1960’s by Ernst Leitz Wetzlar, this Elmaron f/2.8 150m projection lens comes within its original box. 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. *) Source of data: Scarce manufacturer's technical data + own research.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.