Stouffer T0400, stepless scanner grey scale
Stouffer T0400, stepless scanner grey scale
stepless,1 x 10", Dmax 3.05
Step-Wedge T0400-Data
0 steps, Dmax: 3.05, size 25 x 250 mmStouffer Scanner Scales are available in a variety of formats for use on flat-bed or drum scanners. Guides are made in many sizes, stepped or stepless, black and white, transmission or reflection. Resolution patterns can be added to some scales. One of the most popular guides used is the R3705 37 Step Scanner Scale with density increments of .05 optical density. The TP35-21 Step Guide is also popular for it's versatility with film scanners such as the Nikon Coolscan product line. The T0400 is designed to adjust and calibrate scanners.
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.
Specification Transmission step wedge T3110
How to use the Stouffer T2115 Greyscale
(for other step wedges must be recalculated following density steps)Set your contact printer or vacuum frame to make several trial exposures on separate pieces of film, with each exposure for a different length of time. Make three exposures: one determined by past experience or the exposure normally used in daily production, one for less, and then one for more. It may be necessary to repeat this testing procedure using different exposure times. Process the test negative for the time and temperature recommended by the film manufacturer. It is important to keep processing consistent. Examine the step tablet/wedge image on each of the negatives. Select as the best the negative in which step 7(on a 21 step wedge) is developed to a dense black, with step 8 only slightly dense. Step 7 will be the aim point for normal copy.
There are many different ways for exposing plates. There are an abundance of different exposure systems and processing techniques. The one constant is the step tablet/wedge. Use the step tablet/wedge as a benchmark for all exposures to achieve accuracy and repeatability.
To find the exposure factor to hold more or less on the Stouffer 21 Step Platemaker Sensitivity guide, follow the chart below.
| to change exposure | 1 Step | 2 Steps | 3 Steps | 4 Steps |
| increase exposure | 1.41x | 2.00x | 2.82x | 4.00x |
| decrease exposure | 0.71x | 0.50 | 0.35x | 0.25x |