I believe that when you write "B & W" you mean "B+W".
B & W usually means "black and white" as in the chemical silver based film and processing.
B+W is the lens filter maker in Germany, a subsidiary of Schneider Optics. Here's a link:
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http://www.schneideroptics.com/filters/filters_for_still_photography/
Which says, in part:
Schneider Optics - Filters for Still Photography - B+W Filters
The B+W Filter Company has been manufacturing optical filters for over 50 years. Our filters use Schott optical glass from which the filters are diamond cut, precision ground and then polished to ensure flatness on both surfaces and uniform thickness throughout. These, among other innovative measures, allow us to offer filters that meet the needs of even the most discriminating users.
A note to our customers outside the United States: Please contact our parent company in Germany for literature and dealer information.
[links to] Filters
UV / Warming Cooling for Black and White Film Neutral Density Polarizer for Infrared Special Filters Close-up <-- <-- <-- Soft Focus Color Correction Redhancer for Digital Photography Slim-Line Graduated Accessories Distributors Temperature Chart The B+W Difference B+W Handbook
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Notice the CLOSE-UP above. That is what most people are after when they want to focus closer using their existing lenses.
Also, if you lens is interchangeable, you can insert an extension tube between your camera and your lens to enable closer focusing.
Also, there are many other suppliers for close-up filters, also called DIOPTERS. I like Hoya, Tiffen and others.
Enjoy, and share some images when you get the opportunity!
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Love and hugs,
Peter Blaise Monahon Minolta Vivitar Tamron Fujifilm Ilford Kodak Adobe Hewlett Packard et cetera Photographer Member/Liaison of the award winning Northern Virginia Camera and Photography Clubs and Groups USA
peterblaise@yahoo.com http://www.peterblaisephotography.com/