Hi all,
I just purchased a 150mm f/5.6 Schneider Symmar-S MC on a Copal #0 from the "auction site." I haven't shot with it yet, but the aperture scale seems wrong to me. The rear diaphragm opening appears to be 24mm, meaning that wide open, the aperture is effectively f/6.3 (150mm / 24mm = 6.25). This is at its widest setting, with the aperture ring indicator pointing far "outside" the scale above the 5.6 marking. Stopping down to the 5.6 marking, the aperture blades close to 14mm, meaning the f/5.6 setting is effectively f/11 (150mm / 14mm = 10.7).
Does this mean that this Copal #0 shutter isn't matched to this lens? Is my math wrong? Will I need to replace the shutter, or simply have it recalibrated?
Thanks in advance for your answers!
Brett Simison
http://www.brettsimison.com/
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