Light emitted from distant galaxies, which existed long ago in the past, is often too faint to be observed directly from Earth. Strong gravitational lensing magnifies these galaxies, making them ...

The lens includes both a zoom ring and a focus ring ... Another impressive claim is that the lens allows in 99.5% of light, so the lens isn’t cutting back too much of the light that’s coming ...

With well-judged resistance, the focus ring makes manual adjustments a joy. Similarly, the short throw and smooth action of the zoom ring mean it’s swift and easy to shift through the full ...