Owner`s manual

2.3. DYNAX/MAXXUM LENS CHART 16
2 APO Tele Converter
The converters were redesigned with new gear and IC ROMs. External changes include TYPE II
designation. It is OK to use old-style converters on new lenses. Using a new converter on an old, non-
upgraded lens will cause slower focusing
Warning: THE APO CONVERTERS CANNOT BE USED WITH THE 80-200MM APO LENSES. If
mounted together, the front element of the converter will contact back element of the lens and damage both.
2.3.4 Maxxum Lens Glossary
Circular Aperture Defocused background highlights take the shape of the diaphragm in wide-aperture
portrait shots. The 9-blade apertures found in some of the G-lenses is specially designed to provide
a circular opening at widest apertures (small f-numbers). A circular aperture produces softer, more
natural-looking backgrounds at wider apertures than a lens having a standard 5-, 6-, 7-, or 9-bladed
aperture.
Floating Optical Design Rather than moving all lens groups as a single unit, designated optical groups in
some of the G-lenses move independently as the lens focuses. This ”floating” movement provides
an extremely flat image at the film plane thus assuring corner-to-corner sharpness. It also provides
a high degree of control over sagittal flare, and eliminates coma, an aberration that causes off-axis
object points to appear as short ”comet-like” images on film. Reducing sagittal flare and coma
provides an extremely sharp, high-contrast image which more effectively separates the subject from
its background at large apertures.
Internal Focusing The AF 200mm, 300mm, and 600mm APO’s internal focusing system moves lighter
internal lens elements to focus the image instead of the larger front elements used in conventional
systems. This along with a high-ratio lens drive provides quick, accurate focusing of fast moving
subjects. In addition, a focus limiter permits selecting a focusing range for even faster response.
Anomalous Dispersion (AD) Glass Different wavelengths of light come into focus at different planes.
This effect is know as Chromatic aberration and can cause a ”rainbow” halo around points of light
and reduced sharpness. ”Standard” achromatic telephotos are corrected to bring the red and blue
components into focus at the film plane. The Anomalous Dispersion (AD) glass, used G-Series APO
telephotos and zooms as well as the 100-300mm APO and 100-400mm APO virtually eliminates the
effects of lateral and longitudinal chromatic aberration, providing increased sharpness and extremely
accurate color rendition.
Aspheric Design Different than the smooth continuous arc of a normal lens element surface, the curvature
of an aspherical lens element changes shape across its surface. This irregular surface helps to correct
spherical aberration and coma, an aberration that causes off-axis object points to appear as short
”comet-like” images on film. It also reduces sagittal flare. The inclusion of aspheric elements in a
lens design enables designers to reduce the amount of elements in the design. This in turn reduces
the amount of flare producing surfaces, two per element, which increases the contrast and ”snap” to
the final image. The reduction in elements also makes the lens smaller and lighter..
Focus-Hold Button When pressed, it locks focus or can be used to select spot focus or continuous AF
(with Custom Function Card or Customize Function Card xi).
Distance Encoding Distance encoding with new and revised D lenses provides refined multi-segment me-
tering for manual focus operation and depth-of-field display on Navigation Display with the Maxxum
7 as well as ADI flash functions when the new 5600(D) and 3600(D) flashes.
Integral Filters Because a front-mounted filter would be expensive and would cause excessive flare, the
300mm and 600mm Apo lenses have a built-in filter holder. Six filters are provided: NORMAL
(clear), Y52 (yellow), O56 (orange), R60 (red), 1B (skylight) and ND4X (2-stop neutral density).
Achromatic Coating Minolta’s Achromatic, multi-layer coating provides remarkably accurate color ren-
dition and excellent contrast by virtually eliminating reflections between lens elements.