Portable and affordable the ef 28mm f28 is usm is an ideal all purpose wide angle lens for full frame cameras and a high quality compact standard lens on dslrs with aps c sized sensors high quality wide angle lens a 28mm wide angle prime lens offering an 75 angle of view on full frame dslrs on eos cameras with aps c sized sensors it makes a great standard lens offering the equivalent view to a 45mm lens on a full frame camera shoot in low light conditions a maximum aperture of f28 pe