| Needs Assessment | Discuss/Contact | Order/Price Quotes | New & News | Services |
Digital Imaging Technology and Equipment for Libraries, Museums,
Laboratories and Field Work
Rodenstock APO-Sironar Lenses
 |
This line of lenses provides the photographer with an exhaustive spectrum of focal lengths for digital shots in the very highest imaging quality with adjustable profes signal cameras. The fine gradation meets the demands of every motif situation and all chip and scanner formats. Focal lengths from 35 mm mean that real wide-angle shots are possible even with the smaller chip sizes while still allowing large movements. All Apo-Sironar digital lenses are characterized by excellent sharpness and brilliance together with total freedom from color fringes in real apo quality. Due to the relatively small formats on the one hand (higher diffraction!) and the high light require meets of the CCD image sensor on the other, digital photography does not allow the cameras to be stopped down as much as in con ventional large-format photography. As a result, these lenses have been optimized to a working aper ture of 8 to 11. Because both the surface of the chip sensors and the area scanned by the CCD line sensor have greater planarity than conventional roll and sheet films, special atten tion was given to the correction of the curvature of field. The freedom from distortion, which is so impor tent for product and building photography, and the uniformity of illu mination are also excellent. The Apo Macro Sironar digital provides a special lens at the same superb performance level of the Apo-Sironar digital series for highresolution digital photos at reproduction scales from 1:5 to 2:1. The Rodenstock Apo-Sironar digital HR was developed for special applications with extremely high resolution CCD chip cameras and CCD line scanner cameras with pixel sizes of < 10 ~m such as can only be realized with smaller digital camera formats. This lens utilizes every technological possibility to get as close as possible to the absolute limit of diffraction determined resolution. Among other things, even the optical properties and the thickness of the CCD protective glass were taken into the equation of the optical correction. The resolving power and lateral chromatic aberration have been optimized to ensure that the resulting lack of sharpness or the color fringes do not amount to any more than a tiny fraction of the pixel size (which can no longer even be resolved). As a result, even when the digital photos taken with the lens are enlarged to a maximum on the screen, absolutely no color fringes are visible, unless color fringes are added by the pixel structure of a one shot camera back used or due to interpolation. The resolving power of the ApoSironar digital HR is not only a little better for the working apertures of 8 to 11 recommended for other high-performance lenses. You can rather see an increase in performance even with a higher aperture right up to the maximum aperture 4. This increase is reflected in the very high brilliance and detail re production. To ensure that this fantastic quality is not impaired by dif fraction, the HR lenses should always be stopped down as little as possible. This means that the depth of field should be increased for motifs extended in depth by using an optimum lens tilt of the camera for an overall sharp focus. The larger apertures also reduce color noise in the shadows. Lens and Shutter Specification charts. Apo-Sironar-Digital 90 mm f/5.6 performance graphs. |
|
|
Apo-Sironar digital and Apo-Macro-Sironar digital. Apo-Sironar digital 90 mm f/5.6
in the shutter Prontor Protronic 0 |
||
 |
||
|
Apo-Sironar digital HR
Apo-Sironar digital HR 60 mm f/4 in the shutter Prontor Protronic 0 |
||
 |
||
|
Apo-Sironar digital 90 mm f/5.6
in the shutter Copal 0 Optical design: 8 elements/6 groups |
||
 |
||
|
Apo-Sironar digital 60 mm f/4
in the shutter Copal 0 Optical design: 10 elements/6 groups |
 |
||
_________________________________________