Often referred to as ‘trinity’ lenses, wide-angle, standard and telephoto zooms with a constant f/2.8 aperture throughout the range typically include 14-24mm, 24-70mm and 70-200mm focal lengths respectively. They’re relatively ‘fast’ in terms of aperture rating, compared with f/4 zooms and those with a narrower and variable aperture rating that shrinks as you extend through the zoom range.
There’s a catch, however, in that trinity zooms tend to be big, heavy and expensive to buy. But that’s no longer the whole story. So-called ‘alternative trinity’ lenses have become popular, which generally have a slightly different zoom range but retain an f/2.8 constant aperture. Tamron was an earlier pioneer of these trend-setting lenses, including the Tamron 17-28mm f/2.8 Di III RXD wide-angle zoom, Tamron 28-75mm f/2.8 Di III RXD G2 standard zoom and Tamron 70-180mm f/2.8 Di III VC VXD G2 telephoto zoom, the last couple now being in their G2 (Generation 2) editions.
-copy-29e15046.jpeg?w=600)
