Join ePHOTOzine, the friendliest photography community.
Upload photos, chat with photographers, win prizes and much more for free!
A special design of lens that is highly corrected to avoid chromatic aberration by bringing the three blue, red and green wavelengths to one point of focus rather than the usual blue and green of an achromatic lens. Because red is also brought to the same point of focus, you don't need to refocus when taking infrared pictures with this type of lens.
Get on1's Perfect Effects 9.5 for FREE! (£48 value)