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2026-04-11 - Rollei 28.5mm Filters

 

Rollei 28.5mm filters are primarily push-on accessories designed for early Rolleiflex and Rolleicord cameras before the standardized bayonet mount system became universal. While some later Bayonet I filters are also marked with "28.5mm", it is because they share that physical diameter, and are distinct from the early friction-fit versions. 

Types of 28.5mm Filters

These vintage filters were typically made of dyed-in-the-mass optical glass held in metal frames. 

·        Contrast Filters (B&W): Most common are Yellow (Gelb), Green (Grün), Red (Hellrot), and Orange for enhancing sky contrast and skin tones.

·        Color Correction: Light Blue (Hellblau) was used to correct tungsten light or lighten skies in black and white photography.

·        Close-up Lenses: Known as Proxars, these push-on lenses allow for closer focusing distances than the standard lens minimum.

·        Soft Focus: The Duto 0 filter was a popular slip-on accessory for portraiture. 


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