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  Kategorie: Linsen, Diabetrachter, kleine Mikroskope, Fokometer
   

PEAK TELECENTRIC LUPE 7X

   This is a special purpose loupe with a magnifying power of 7 times. It belongs to the category of scale-loupes with an affixed transparent glass scale which can be placed in contact with the object under examination, so that you can measure the length of the object very easily and accurately. However, the magnifying optical system of this loupe is not conventional, but is "telecentric", i.e. characterized by a small opening fixed at the focal point of the lens system, through which you can measure the length or width of not only flat objects, but also three-dimensional ones such as small spheres, cylinders etc. without the error caused by parallax. This handy instrument is equivalent in its principle to expensive profile projectors. The lens system, composed of three elements in two groups, has been specially designed for the present purpose. 
   To use the loupe, first adjust the distance between the glass scale and the lens system by turning the knurled outer barrel until the scale can be sharply observed by your own eye through the opening with the largest diameter (3 mm), which can be selected simply by turning the turret ring at the top of the loupe. Then place the loupe upon the object to be measured so that the scale plate is in contact with it, and read its length by the scale. The scale is engraved 20 mm in total length at every 0.1 mm interval, so you can measure the length of objects with an error of less than 0.03 mm.
   When measuring three-dimensional objects. the opening with the minimum diameter (1 mm), or preferably the one with a slit of 0.5 mm in width should be used; and the orientation of the slit should kept perpendicular to the direction along which the length of the object is to be measured. Even in these cases, the portions of the object that are not in contact with the scale plate may be fuzzy because they are out of focus. However, no error can occur in the measured length, as long as you measure the centre-to-centre distance of blurred images, thanks to the characteristic of the "tele­centric" system. The low brightness of the image due to the small openings can be compensated for by higher illumination of the object.
   This loupe can be applied very effectively as a reading aid for mercury thermometers. By putting the end surface of the transparent tube of the loupe (the scale plate of which should, preferably, be taken off) correctly against the thermometer tube, you can read the temperature extremely accurately and without any parallax, even if the mercury thread and the temperature scale are not in the same plane. The slit-form opening is used very effectively in this case, with its orientation kept parallel to the engraved lines of the ther­mometer scale. (Care should be taken that your body temperature does not affect the temperature to be measured.) Also, by replacing the transparent tube of the loupe with a tube of the proper length and by putting its end surface squarely on the window of voltmeters etc., you can read the indication of the meter needle very accurately and without any parallax.

1999

Telecentric Lupe
7X

 Magnification:
-
 7X
Field of view:
-
 24 mm
Size:
-
 38ø x 74 mm
Net weight:
-
 73 gm.
Scale length:
-
 20 mm.
Min. Scale Division:
-
 0,1 mm

PEAK ENLARGING FOCUSER

   These focusers are auxiliary instruments which ensure extremely sharp focusing of your photo-enlarger not only at the picture centre portion but also at any position within the picture area. With the aid of these focusers, you will be able to demonstrate the full performance of your enlarger and obtain pictures of unparalleled sharpness.

Construction and Principles of Focusers

   The focuser mainly consists of a mirror, a loupe and pattern plate. The bottom surface of the pattern plate and the basement surface of the focuser are adjusted so that they will be in positions accurately symmetrical to the mirror. Therefore, when the focus of the enlarger is adjusted to cause the enlarged image of the negative to correctly focus on the bottom surface of the pattern plate, the enlarged image of the negative is correctly focused on the photographic paper, when you remove the focuser from the easel. Even if you place the focuser at a position deviated from right below the optical axis  of the enlarger, there will be no change in obtaining correct focusing.

Features of Respective Focusers

   Model I. This model employs Kellner’s loupe and a mirror of 86 mm in length. Since the loupe portion is arranged to allow swinging, focusing is possible within the range in which the optical axis of the enlarger lens forms an angle of about 30° with the optical axis of the loupe. Model I has an aluminium die-cast body in high-class black-paint finish.
   Model II. This model has the same basic design as Model I. With its four-angled is possible to focus clearly on the mirror surfaces forming an angle of about 20° from the optical axis of the viewfinder.
   Model III. This  model too has the same basic design as Model I and II. Focusing can be accomplished smoothly within the range in which the optical axis of the enlarger lens forms an angle of about 10° with the optical axis of the focuser.


2000

2020


2030

PEAK POCKET MICROSCOPE

   The main features of this Pocket Microscope are: very sharp resolution power throughout its field of view, unbelievably brightness and light weight. It is a practical and convenient pocket microscope for technicians and engineers.
   To focus the microscope, hold it so that the notch at the tip of the acryl cylinder of the microscope will face towards you, place the centre of the object lens right above the specimen and, while tilting the cylinder forward and backward with your eye on the eye-piece lens, fix the cylinder and observe at an angle which can give the sharpest image.
   Similar to the pocket microscopes of the 2001 series, the 2001 long is characterized by a barrel longer than the previous one and this feature allows to adopt a comfortable and sitting posture while you observe an object.


2001

2001 long
Pocket Microscope





Pocket Microscope

 

 Item No. 2001-15 2001-15long 2001-25
Magnification 15X
15X
 25X
Field of view 5.40 mm ø 5.40 mm ø 3.30 mm ø
Size(mm) 12.4øx127 12.4øx180 12.4øx127
Net weight 13 gm. 18 gm. 12 gm.
 
Item No. 2001-50
2001-75
2001-100
Magnification
 50X
75X
100X
Field of view 2.00 mm ø1.09 mm ø 0.84 mm ø
Size(mm) 12.4øx127 12.4øx127 12.4øx127
Net weight 12 gm. 13 gm. 16 gm.

 
  See also: 2008 / 2050 / 2051 / 2056 / 3703

PEAK LINEN TESTER

   Peak Linen Testers are convenient folding type magnifying glasses for inspecting cloth. They are widely used as portable magnifiers and are available in the various models shown in the following table.

2003WA3   1504WA3
1006WZ3   3408WZ3  1209WZ3
1006SA3   3407SA3  1209SA3
 
 
Item Base size (in.) Base size (mm) Magnification Lens element Material Surface treatment
1209SA3 1/2 10 9X 1 Aluminium Black
3407SA3 3/4 15 7X 1 Aluminium Black
1006SA3 1 25 6X 1 Aluminium Black
1209WZ3 1/2 10 9X 2 Zinc Black
3408WZ3 3/4 15 8X 2 Zinc Black
1006WZ3 1 25 6X 2 Zinc Black
1504WA3 1½ 30 4X 2 Aluminium Black
2003WA3 2 50 3X 2 Aluminium Black
 
Explanation of article description
*     First two numbers of four show the length of base on which each scale is marked  (e.g. 12=1/2", 34=3/4",10=1").
*     Last two numbers of four show the magnification (e.g. 09=9X, 07=7X).
*     S shows single lens and W shows double lenses.
*     A shows frame of aluminium and Z shows of zinc.
*     The last number shows the surface treatment of metal frame (e.g. 0=silver paint, 3=black paint).

   See also: 2052

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