150mm, f2.8, 1/1250 of a second

150mm, f2.8, 1/640 of a second

Interesting Macro Fact of the Day:
These pictures were taken a few seconds apart at the same iso, aperture, and in the same lighting conditions. So why the different shutter speeds? Macro lenses, when they start focusing really close are actually a lot darker than the aperture suggests. If we measured the amount of light coming into this lens when it’s focused really close, it is probably about half the light (around an f4 value), even though the aperture blades haven’t moved from their open position. This happens with all macro lenses.