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title: Catalog RFQ Negative Cylinder
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[![Ross Optical](https://custom-optics.rossoptical.com/hs-fs/hubfs/Ross-POCI-Logo-Horizontal.png?width=200&height=86&name=Ross-POCI-Logo-Horizontal.png "Ross Optical")](https://www.rossoptical.com)

# Negative Cylinder

| Negative cylinders have one flat surface and one concave surface and have a negative focal length.     Below are our standard negative cylinder specifications.  Don't see what you need? Request custom optics. Lens Type Negative Cylinder Length Tolerance ± 0.10 mm Glass Type N-BK7 Width Tolerance ± 0.14 mm Dimension Unit mm Center Thickness ± 0.50 mm Focal Length ± 2% Surface Quality 60-40 Surface Accuracy Y-Direction X-Direction 1/2 Wave Centration < 3 arc minutes 1/2 Wave per 25 mm Clear Aperture 90% Flat Annulus   0.50 +0 / -0.40     Coating Uncoated, Specify your coating (See Coating Chart for Available Options) * All dimensions are in mm |
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