Panny 25mm 1.4 vs Olympus 25mm 1.8 Reviewed

Started 6 months ago | Discussions thread
Ido S
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T-stops
In reply to dgrogers, 6 months ago

The difference in required shutter speeds for any given aperture is caused by the T-stops of the lens. That's the amount of light that actually manages to hit the sensor, whereas F-stops represent the amount of light that goes through the aperture diaphragm. We'll have to wait on a scientific confirmation, from the folks at DxO Labs (who are in charge of the famous, and infamous, DxOMark), as well as SLR Gear, etc.

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