Lenses with a very wide maximum aperture are often called 'fast' lenses – wide apertures allow faster shutter speeds. It’s not just about exposure, though. Changing the aperture also changes ...

Skip to content viewer section. ABSTRACT PPak is a new fiber‐based integral field unit (IFU) developed at the Astrophysical Institute of Potsdam and implemented as a module into the existing Potsdam ...