Most famously associated with Soligor, designed in the 1960s (apparently by Tokina), the T4 mount was intended to compete with
Tamron's T-thread, and the later Adapt-A-Matic mounts. The idea behind these mounts was 'one lens, any mount'. A retailer, for instance, only had to keep one lens model and a few, cheap mounts, rather than many lenses in every different lens mount. It allowed automatic aperture, aperture indexing/metering facilities. Mounts were offered in almost all popular fittings. It was superseded by the TX system, sold by Vivitar (though the T4 mount was compatible with TX lenses.) Vivitar as a brand name was owned by Ponder & Best at this time (T4 for Two). • T4 interchangeable mounts were produced for: •
Canon FL (same as FD) •
Exakta •
Icarex BM •
Leicaflex •
Minolta SR (Uses MC and MD line of lenses) • Miranda bayonet (Model F, G, & Sensomat) • Miranda Sensorex (with meter coupling arm) •
Nikon F (non-AI) •
Pentax/Praktica universal screw (M42) •
Petri •
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