![nikon scan ls-4000 nikon scan ls-4000](https://farm5.staticflickr.com/4106/5026638205_69fe2da887_o.jpg)
This is bad for image quality because it causes chromatic aberrations or CAs, where the different wavelengths or colors end up being focused at different points. The optical glass used in lenses disperses or separates light in varying degrees (this effect is best illustrated with a prism). Almost all fast lenses and almost all macro lenses show LoCAs at larger apertures. LoCAs are extremely difficult to correct, especially wide-open, and only a handful of lenses are LoCA free. Longitudinal CAs, or LoCAs, are visible as halos of different colors in out-of-focus areas, usually magenta in front of the focus point and green beyond. CAs are pretty common with fast lenses and wide-angles at larger apertures. Lateral CAs, or just CAs, are visible as red and blue fringing at hard edges, especially towards the corners of an image. An APO lens should have correction of both types of chromatic aberrations lateral CAs and longitudinal CAs. The Scanner Nikkor ED lens is an apochromatic or APO lens, corrected for chromatic aberration in the red, blue, and yellow wavelengths, this really adds to the subjective perception of sharpness.
#NIKON SCAN LS 4000 FULL#
Mounting threads: None Filter threads: NoneĬlick on one of the images below to open in a full-size light-box view. All images made with Scanner-Nikkor ED lens, full frame camera, Nikon D810, 1X magnification, Photoshop CC ACR with chromatic aberration correction turned off. Working distance: I measured 140mm WD at 1X. Beyond 1.2x, the corners start to soften at 1.25x, and the center is sharp to at least 1.4x. Magnification range: The Scanner-Nikkor ED 100mm lens performs best in the range of 1.1 to 1.2x.
![nikon scan ls-4000 nikon scan ls-4000](https://www.manualsdir.com/manuals/194343/14/nikon-ls4000-page14.png)
An APO objective should have correction of both types of chromatic aberrations or CAs, lateral CAs, or color fringing, and longitudinal CAs, or LoCAs, also called Bokeh CAs. This really adds to the subjective perception of sharpness.
![nikon scan ls-4000 nikon scan ls-4000](https://www.filmbodies.com/_Media/csv-processed-nikon-scan_med_hr.jpeg)
The image is scanned two times, the first as the regular RGB scan and the second captures defects like dust and scratches preserving the important details.Īn apochromatic or APO objective is corrected for chromatic aberration at the red, blue, and yellow wavelengths. The correction extends into infrared range to cover the LED output since dust and scratch removal functionality is based on the hardware by using the scanner‘s infrared channel for defect detection. This infrared light wave-length allows it to pass through film emulsion of negatives and slides without resistance but the scratches and dust particles reflect it. Nikon lists 6 extra-low dispersion elements in the design of this lens but it looks like all of the elements in the lens are low and extra-low dispersion type glass.Ĭhromatic Correction: This lens is APO corrected in the spectral range of 438 – 852nm. Most current macro lenses feature some low-dispersion elements in their design, the Canon EF 100mm f/2.8L Macro and Sony's FE 90mm f/2.8 Macro G OSS lens both have 3 low-dispersion elements. Eventually there will be a separate web page for the 7 element lens.ĮD is the abbreviation for the extra-low dispersion glass that is used in the lens design. There are two Scanning-Nikkor ED lenses that I know of, one uses a 14 elements in 6 groups design, including 6 ED glass element lens, the other uses 7 elements in 4 groups including 3 ED glass element lens in the design. Optical Design: 14 elements in 6 groups design, including 6 ED glass elements. Focal length: 100mm Aperture: Nominal aperture f/2.8, measured f/3.1 forward and f/3 in reverse on the 9000 type and f/3.0 and f/2.9 on the 8000 lens.