DE539147C - Device for determining the exposure time - Google Patents
Device for determining the exposure timeInfo
- Publication number
- DE539147C DE539147C DENDAT539147D DE539147DD DE539147C DE 539147 C DE539147 C DE 539147C DE NDAT539147 D DENDAT539147 D DE NDAT539147D DE 539147D D DE539147D D DE 539147DD DE 539147 C DE539147 C DE 539147C
- Authority
- DE
- Germany
- Prior art keywords
- wedge
- ground glass
- determining
- exposure time
- gray
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000005337 ground glass Substances 0.000 claims description 11
- 238000005259 measurement Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
- G01J1/12—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using wholly visual means
- G01J1/14—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using wholly visual means using comparison with a surface of graded brightness
Description
Verrichtung zur Bestimmung der Belichtungszeit Die Erfindung stellt eine Vorrichtung dar zur Ermittlung der Belichtungszeit mittels abgestuft lichtdurchlässiger Schichten bzw. Graukeil, Farbkeil o. dgl., welche auf der Mattscheibe beliebig verstellbar sowie auch leicht entfernbar angebracht sind; letzteres zwecks Freilegung der Mattscheibe.Device for determining the exposure time The invention provides a device for determining the exposure time by means of graduated translucent Layers or gray wedge, color wedge or the like, which can be adjusted as desired on the focusing screen and are also easily removable; the latter to expose the ground glass.
Die bekannten Vorrichtungen dieser Art haben den Nachteil, daß bei ihnen nicht möglich ist, die Mattscheibe zur Scharfeinstellung hinreichend freizulegen. Sie reichen höchstens zur Scharfeinstellung (Distanzmessung) aus. Zur Beurteilung des Mattscheibenbildes auf Bildgliederung, Raumverteilung, Regulierung der Beleuchtung, Erzielung genügender Tiefenschärfe usw. sind sie ungeeignet.The known devices of this type have the disadvantage that at it is not possible for them to expose the screen sufficiently for focusing. At most, they are sufficient for focusing (distance measurement). For evaluation the focusing screen image on the structure of the picture, room distribution, regulation of lighting, They are unsuitable for achieving sufficient depth of field, etc.
Eine Einrichtung, die neben der Licht- oder Helligkeitsmessung diesen wichtigen Ansprüchen gerecht werden soll, verlangt eine verhältnismäßig große Freifläche der Mattscheibe. Dies wird durch den in den Abbildungen dargestellten Erfindungsgegenstand erreicht.A device that, in addition to measuring light or brightness, can do this If important requirements are to be met, a relatively large open space is required the screen. This is made possible by the subject matter of the invention shown in the figures achieved.
Abb. i zeigt den Grau-, Farbkeil o. dgl. b auf der Mattscheibe angebracht, paraliel zur Querachse der Mattscheibe verschiebbar in den Führungsschienen des Mattscheibenrahmens d, Abb. a den Graukeil o. dgl. drehbar um seine Mitte angeordnet, Abb. 3 wie nach Abb. i, jedoch parallel zur Längsachse der Mattscheibe verschiebbar. Schnitt A-B zeigt den in einem federnden, in Scharnieren endenden Klappenhalter d gleitenden Graukeil, Farbkeil b o. dgl. gegen die Mattscheibe b angedrückt. Die Wirkungsweise der Vorrichtung ist folgende: Man betrachtet das Mattscheibenbild durch den Farb- oder Graukeilmesser, welcher über die Mattscheibe gleitend bewegbar angeordnet ist, so daß nahezu an jeder Stelle der Mattscheibe die Messung auf Lichtdurchlässigkeit vorgenommen werden kann. Da die Führung des Grau- oder Farbkeiles in aufklappbaren, federnden Halteleisten gleitet, kann der Farbkeil im Bedarfsfalle mit einem Griff herausgenommen werden zur Messung von auf anderem Wege nicht erfaßbaren Stellen.Fig. I shows the gray, color wedge or the like b attached to the focusing screen, parallel to the transverse axis of the ground glass slide in the guide rails of the Ground glass frame d, Fig. A the gray wedge or the like arranged rotatably around its center, Fig. 3 as in Fig. I, but displaceable parallel to the longitudinal axis of the ground glass. Section A-B shows the flap holder in a resilient, hinged end d sliding gray wedge, colored wedge b or the like pressed against the ground glass b. the The mode of operation of the device is as follows: The focusing screen image is viewed by the color or gray wedge knife, which can be slid over the ground glass is arranged so that the measurement for light transmission is carried out at almost every point on the screen can be made. Since the guidance of the gray or color wedge in hinged, resilient retaining strips slides, the color wedge can if necessary with a handle can be removed for the measurement of places that cannot be detected in any other way.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE539147T |
Publications (1)
Publication Number | Publication Date |
---|---|
DE539147C true DE539147C (en) | 1931-11-23 |
Family
ID=6558457
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DENDAT539147D Expired DE539147C (en) | Device for determining the exposure time |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE539147C (en) |
-
0
- DE DENDAT539147D patent/DE539147C/en not_active Expired
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