Stouffer TP120-31, 31-step transmission projection step wedge
31 steps, increment 0.10, 2,25 x 2,25", Dmax 3.05
TP120-23 data
31 steps, increment 0.10, Dmax 3.05, 57 x 57 mm
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The Stouffer TP Transmission Projection step wedges . A conversion chart indicates the proper exposure in seconds
Transmission Projection (TP) Step Wedges are most commonly used in the enlarger to establish exposure and processing adjustments and to determine the speed and contrast of photographic papers
RoHS-Compatibility:
Products manufactured and sold by Stouffer Industries are RoHS compliant. All step wedges, step tablets, gray scales, and any other photosensitive quality control device made contain no or less than agreed levels of lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyl (PBB) and polybrominated diphenyl ether (PBDE) flame retardants.
Longlivety:
Stouffer Step Tablets and Gray Scales are made under controlled conditions to meet or exceed the requirements for archival permanence following procedures recommended by the manufacturers of the materials. Archival permanence is usually defined up to 10 years or more. Studies at the National Institute of Science and Technology have shown that the densities of this kind of step tablet will remain stable for at least four years when handled and stored with care.The primary causes of degradation are use, followed by ( in no particular order) heat, humidity, fingerprints, splashes including spittle, chemical fumes and vapors, attempts to clean the emulsion with anything other than a soft camelhair brush, and abuse.A quality control device that is handled 40 times a day will degrade faster than one that is handled once a week. The user should set a routine to determine the frequency of replacement based upon factors occurring in-house and the foregoing discussion.We recommend to change the step wedge after 3-6 months and immediately at visual damage
Calibration:
This step wedge is also availabe in calibrated version. Please allow extra charge and lead time of about 4 weeks.