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Optics (600mm): 2 elements in 2 groups; 3 elements in 3 groups (T-noflexar) Aperture (600mm): 1:8 manual only. Iris: 24 blades! Filter: varies with optics. Filter on a 42xxx serial T-noflexar 600mm for PIGRIFF-A (screw connect) was 75mm, but on a 46xxx serial...