B+W 72 mm Graduated #501 Neutral Density (ND) .3 Glass Filter
B&W 72 mm Graduated #501 Neutral Density (ND) .3 (1-stop) Glass Filter - The neutral gray half of this filter transmits 50% of the incoming light so that it darkens the respective portion of the subject by one f-stop without altering its colors.
Often it is necessary or desirable to balance the light intensity in one part of a scene with another. This is especially true in situations where you don't have total light control, as in bright contrasting landscapes. Exposing for the foreground will produce a washed-out, over-exposed sky while exposing for the sky will leave the foreground dark and under-exposed. This filter enables cloud detail to be kept correctly exposed in the picture.
Determining which graduated neutral density filter yields ideal results for any given lighting situation takes knowledge, experience and a collection of such filters. Choose the filter strength which adjusts the lighting to stay within the exposure latitude (greatest difference between bright/dark values) which still shows details in both of the digital or film medium in use.
Speaking generally, the 2-stop value (ND 0.6 - the filter's clear portion allows 4x more light to pass vs. darkest portion) effectively compensates average bright sky-to-foreground situations.
Neutral Density filters have four main uses
- To enable slow shutter speeds to be used, especially with high speed films, to record movement in subjects such as waterfalls, clouds, or cars
- To decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their background
- To decrease the effective ISO of high speed film (above ISO 400) and allow it to be used outdoors in bright situations
- To allow cine and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes which could cause overexposure
Neutral Density factors
- ND.3 (exposure adjustment = 1 stop, reduces ISO 1/2)
- ND.6 (exposure adjustment = 2 stops, reduces ISO 1/4)
- ND.9 (exposure adjustment = 3 stops, reduces ISO 1/8)
- ND1.2 (exposure adjustment = 4 stops, reduces ISO 1/16)
| Type | Graduated Neutral Density #501 |
| Size | 72 mm |
| Grade | .3 (1-stop) |
| Filter Factor | 1 stop, reduces ISO 1/2 |
| Multi-Coated | No |
| Rotating | No |
| Effect | Balanced light intensity from one part of a scene to another |
| Application | Nature, Travel, Outdoor photography; to maintain light control, as in bright contrasting landscapes; i.e. bright sky, dark foreground |
| Color Temperature | Not specified |
| Construction | CR-39 Acrylic |
| Front Filter Thread Size | 72 mm |
| Front Lens Cap Size | 72 mm |
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Comments about B+W 72 mm Graduated #501 Neutral Density (ND) .3 Glass Filter:
Everything is great except the fac that u might have difficulties to define darker area of the filter once it's on a lens
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