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Digital photographers contantly struggle with pattern moiré and aliasing caused by the interference between repeating patterns in the subject (such as tweed or denim fabrics) and the receptors on the CCD used to capture the image.

Originally developed to eliminate the scan lines when  photographing TV screens, we have modified these optical filters for use by digital photographers, to eliminate moiré.  They are also effective in eliminating aliasing ("Christmas Tree light" effect).  The filters are far more effective and rugged than the fragile (and exceedingly expensive) dichroic filters offered by some manufacturers.

Since they are used in front of the lens when making the shot, they eliminate the problem at the source, so there is no need for electronic re-touching.

Used with capture-backs by Phase One, Kodak DCS, MegaVision and others , the filters diffuse the original to eliminate the interference pattern (moiré) created between the  CCD array and regular, repeating patterns.  Since they are optical filters, rather than soft focus, the image itegrity and sharpness is maintained.  They are also effective in eliminating aliasing (often referred to as "Christmas tree light" effect), caused by improper interpolation by the software of the data from the different color receptors. 

Four filters are available,  designated as follows:   4.0, 5.6, 8.0 and 11.0.    The higher the number filters provide greater sharpness at the cost of less elimination of moiré.  The numbers do not correspond to f-stops, but rather to the diameter of the pattern of circles that make the filters work.

The filters are available in three configurations:
1.  2.5 inch diameter round filters, mounted in Series 8 (67mm) threaded filter rings for $119.
2.  As above, but with a double filter ring.  This gives you female threads in front of the filter, so you can mount a shade in front, for $130.
3.  Four inch square filters with a working area of about 3.5 inches for large diameter and wide angle lenses, designed for Lee and other drop in filter-holder systems, for $160.

Call (800)-222-0325 to order or for more details.  Commercially available step-up or step-down rings allow the filters to be used with any lens on any camera.  An adjustable adapter is available for $98 that allows the filters to be mounted on all lens barrels up to 4.5 inches in diameter.

Here are a few tips to help you fight moiré:
1.  Make sure you evaluate a printed image, not the preview on the monitor.  Since the resolution on paper is much higher, the print will look better!
2.  Adjusting the unsharp masking will help increase image sharpness.
3.  Distance from the lens and camera angle can have dramatic effects on moiré, so experiment, if needed.
4.  Longer exposure times may result in less moiré.
5.  Apertures smaller than f:16 often result in less moiré

Do you need a good source for magnifiers, linen testers, and pocket microscopes to check your work?  Click to see our complete magnifier selection!

Caprock Developments Inc./PO Box 95/Morris Plains, NJ 07950 USA 
Since 1953.  Delivery available to all points worldwide.
Tel. (800)-222-0325 / (973)-267-9292 from 9:00AM to 5:00PM Eastern Time / Fax (973)-292-0614