Rodenstock Center Filter E67/86 - 2.5 Stops. For critical shots (e.g. with areas of uniform brightness towards the image corners) the physically inevitable light fall-off according to the cos4 law can be eliminated by using the neutral gray Rodenstock center filters available for all Apo-Grandagon and Grandagon-N lenses. A center filter should always be used if the image circle of a wide angle lens is used right up to the vicinity of the circumference.

Rodenstock center filters are concentric graduated neutral gray filters whose density decreases from the center up to the transparent rim. The fall in density compensates for practically all the light fall-off to the image edge from a working f-stop of 16. The exposure must be corrected by 1.5 or 2.5 stops. This corresponds to a correction of the exposure time by a factor of 3 or 5 respectively (either aperture or exposure time have to be corrected, not both at the same time).

The high quality of the large format image can immediately be seen by looking at a picture taken using a large format lens. It will have the brilliance, full detail, precision, and sharpness that can only be achieved using this photographic medium. Most importantly, Rodenstock large format lenses are top-quality lenses that meet all the demands of the photographic industry. In large format photography there is no rigid connection between the lens and the film, compared to that of the small and medium formats. The free movement of lens and film standard enables better correction.

• For Rodenstock Lenses: 35mm, 45mm, 55mm APO Grandagon
• Mount Thread Size: 67mm
• Front Filter Thread Size: 86mm