The B+W 39mm 0.6 ND MRC 102M Filter is a solid neutral density filter providing a 2 stop exposure. This 0.6 density creates a darkening of the entire image, allowing you to photograph with a wider aperture or slower shutter speed than normally required. By slowing your exposure time or increasing your aperture, you are able to control depth of field and convey movement more easily. Neutral density filters do not affect the overall coloration of the image.

　

This filter is  made in Germany using high quality Schneider optical glass held in  place by heavy duty brass rings, these filters are the epitome of quality;  It is useful for the observation  and documentation of industrial processes with extreme brightness, such as  steel furnaces, incinerators, glowing filaments in halogen- and other bulbs;  It prevents strong flare and brings out interesting details.

　

          

MRC Coating (Multi-Resistant  Coating)

　

It  can minimize reflection at the filter surfaces which reduces  flare and ghosting. 

　

It is not  only an extraordinarily effective multiple layer coating, it is  also harder than glass, so that it protects filters from  scratches *for instance when cleaning the filters), and it is  also water and dirt repellent, thus facilitating filter  maintenance.

　

          

Newly-improved F-Pro mount

1. Maintain the excellent  quality of materials, fabrication, and high mechanical  stability;

2. Become thinner, so that  now it can also be used on many wide-angle lenses without the  danger of vignetting. 

3. Modified retaining ring,  which is no longer threaded in from the front, but holds the  filter glass in place from the back.  This prevents the  retaining ring from being accidentally loosened during the  removal of an additional filter or a lens hood that has been  screwed in too tightly.

　

          

They have no effect on color balance. They have four main uses:

1) 0.6 ND filter darkens the image, allowing you to photograph with a longer shutter speed or wider aperture than normally required..

2) Providing a 2 stop exposure reduction, this filter allows you to control depth of field and convey movement more easily. 

3) Filter does not affect coloration of the image. 

4) Multi-Resistant Coating offers both protection to the glass and helps to improve light transmission and image quality. 

　

　                

Neutral Density Filter Number	Filter Factor	f-stop Reduction	Density
101	2	1	0.3
102	4	2	0.6
103	8	3	0.9
106	64	6	1.8
110	1,000	10	3.0
113	10,000	13	4.0
120	1,000,000	20	6.0