Filtres dégradés pour objectifs grand angle : Ces filtres à gradation concentrique sont conçus pour compenser la perte naturelle de luminosité des objectifs grand angle du centre vers les bords de l'image. Leur utilisation est conseillée pour les focales inférieures au 90mm en 4X5 inches et au 165mm en 8X10 inches.
When working with ultra-wide-angle lenses, the falloff of illumination towards the corners is sometimes disturbing. For this reason, concentrically graduated Center Filters have been designed to compensate for this vignetting.
These filters have a transparency which increases gradually from the center to the edges of the filter where it reaches full transparency. The transmission is independent of the wavelength of the visible spectrum. In order to avoid overexposure and with consideration of the exposure latitude of the film emulsions, we have not fully compensated for the vignetting of the lens.
It must be remembered that, when working with ultra-wide-angle lenses, one should avoid high-contrast films, underexposure, and non-uniform field illumination as much as possible.
Les bagues de mise au point Rodenstock ne sont disponibles que pour Copal 0
Professional Lenses : Bague de mise au point disponible pour Copal 0 uniquement. Le montage est assez simple à réaliser, mais si vous le préférez votre objectif peut être monté en usine.
Professional Lenses : Focus Mount pour Apo-Grandagon f = 35 mm
Professional Lenses : Focus Mount pour Apo-Grandagon f = 45 mm
Professional Lenses : Focus Mount pour Apo-Grandagon f = 55 mm
Professional Lenses : Focus Mount pour Grandagon-N f = 65 mm
Professional Lenses : Focus Mount pour Grandagon-N f = 75 mm
Professional Lenses : Focus Mount pour Grandagon-N f = 6.8 / 90 mm
Professional Lenses : Focus Mount pour Apo-Sironar-S f = 100 mm
Professional Lenses : Focus Mount pour Apo-Sironar-S f = 135 mm
Professional Lenses : Focus Mount pour Apo-Sironar N & Apo-Sironar-S f = 150 mm
Professional Lenses : Focus Mount pour HR Digaron-S f = 23 mm
Professional Lenses : Focus Mount pour HR Digaron-S f = 28 mm
Professional Lenses : Focus Mount pour Apo-Sironar digital & HR Digaron-S f = 35 mm
Professional Lenses : Focus Mount pour HR Digaron-W f = 40 mm
