Light meters
Minolta Autometer Professional User manual
User manual for Minolta Autometer Professional. 20 pages in English. Read the original PDF, download or print a copy without registration.
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Document details
- Brand
- Minolta
- Model / document
- Minolta Autometer Professional
- Document type
- User manual
- Language
- English
- Pages
- 20
- File size
- 2.3 MB
- Category
- Light meters
- Document date
- Not specified in catalog
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Page 2 · Read text
MINOLTAwww.ophancameras.comAUTOMETER
PROFESSION
OWNER'SMANUAL
eView original page 2Page 3 · Read text
I www.ophancameras.com
CONTENTS FEATURES
S P E C I F I C A T I O N S 1 . Your Minolta Autometer Professionalfea-
NAMES OF PARTS 2 tures effortless one-hand operation with a
B E- l Fr Ol r n ER E UL r r )SE E 3 battery-powered, moving scale that gives
lnserting battery 4 instant direct readings completely auto-
Checking Battery 5 matically - no needle reading or manual
Setting film speed 5 dial alignment necessary.
HOW TO USE This Prometers sensitive CdS cell and
For Normal Photographic Incident Light high-gradeintegrated circuit give both inci-
Measurement............. ..................6 dent- and reflected-lightreadingswith high
For ReflectedLight Measurement....................B accuracy over an unusually high range.
Under- and OverexposureWarning Lamps The light, sturdy unit features automatic
and High and Low Setting ...........10 over- and underexposure warning lamps
USE OF ACCESSORIES 1 1 that flash when light is above or below
Disk-TypeDiff user for llluminanceMeasuring.. l2 acceptablerange.
Pinpoint Receptorfor MeasuringLight
on Groundglass........... ..............13
To Determine (Subject of Lighting)
Contrast Ratio .......14
To Read Exposurefor Small Areas ...................14
Spot Mask to DetermineEnlargingExposure ... 16
C A R E A N D S T O R A G E . . . . . . . . . . . . . . . . . . 1 7View original page 3Page 4 · Read text
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SPECIFICATIONS
Type: Special high-sensitivityCdS-cell incident-light measuring type that also measures
reflected light with attachment and gives instant direct readingsfrom a scaledialthat
moves itself continuouslyand automaticallyby battery power
Measuringrange: lncident: Low range-3EV to 7EV; high range7EV to 17EV
Reflected:Low range0EV to lOEV; high range 10EV to 20EV
Light receptors: Incident with sphericaldiffuser
Reflected light attachmentwith 10o angleof acceptance
Scaleranges: Film speeds:ASA 6 to 25,000, DIN 9 to 45
Apertures: F1 to F90
Cine frame speeds:8 to 128fps
EV: -7 to 25
Shutter speeds:1/8000sec. to2hr.
Power source: One 6v silver oxide battery, Eveready No.544, Mallory No.PX-28, or equivalent
S i z e : 4 2 x 6 7 x 1 3 1 m m ( 1 - 5 l B x 2 - 5 l B x 5 - 1 / 8 i n . )
Weight: 30Og (10.4 oz.l
Accessories: Ref lected light attachmentwith 10o angleof acceptance
Disk-typediffuser for illuminancereadings
Spot mask attachment for enlargerexposure
F iber-optics-typepi npoi nt receptor
Others: Over-andunderexposurewarning lamps
Battery check button and indicator lamp
Rotating receptor head
EV, Lux, ft-c conversiontable on back of bodyView original page 4Page 5 · Read text
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NAMES OF PARTS EV, lux, f t-c Conversion
Tab le
MeasuringButton Incident/Reflected
H igh MeasuringR ange Setting Function Selector
Rotating Light Receptor Head
G u ide N otch f or R ef lected L ight
MeasuringAttachment
Overexposure Warn ing Lamp
U nderexposure Warn ing/
Battery Check Lamp
ASA Film Speed Scale
Low MeasuringRange Setting
High/Low Range I ndicator
ReferenceNumber Scale
for Accessories
EV N umber Scale
Film SpeedSetting Disk Grip
Cine Scale
Shutter Speed Scale
Lens Aperture Scale
DIN Film SpeedScale
High/Low RangeSelectorDial
Incident/Ref lected Battery Chamber Cov
Setting I ndicator W indow Battery Check ButtonView original page 5Page 7 · Read text
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BEFOREUSE
Inserting Battery 2. f nsert a 6v silver oxide battery (Eveready
No.544, Mallory No.PX-28, or equ ivalent)
1. Slide off battery chamber cover as as indicated by + and - symbols.
cated. Replace cover securely.View original page 7Page 8 · Read text
www.ophancameras.com Checking Battery Setting Film Speed Wh ile depressing measuring button, push Use molded lucite grips to turn film speed battery check button on back of meter. lf setting disk until desired film speed graduation battery check lamp lights, battery is serviceable. line is set opposite ASA or DIN scaleindex.View original page 8
Page 9 · Read text
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HOW TO USE For Normal PhotographicIncident Light Measurement
2. Be sure incident/reflected function selector
on back of meter is set to INC position. INC
should appear in incident/reflected setting
ind icator window on f ront of meter. Selec-
1. Be sure sphericaldiff user is screwedsecurely tor can be turned with a coin or other
into position on receptor head. implement.View original page 9Page 10 · Read text
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3. With spherical diffuser turned toward and
receivingtotal illuminationof light source(s)
from subject position, push measuringbut-
ton. lf either under- or overexposurewarn-
ing lamp light, adjust as indicated.lf neither
lamp lights, simply read indicated exposure
from scale desired when dial stops moving.
- J
\ffi\uView original page 10Page 11 · Read text
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For Reflected Light Measurement
2- Be sure incident/reflected function selector 1. Attach reflected light measuringattachment on back of meter is set to REF position. I
by aligning bracket on attachment with RE F should appear in incident/reflected
notch provided on head and turning the setting indicator window on front of meter.
grooved collar to screw securely into re- Selector can be turned with a coin or other
ceptor socket. implement.
I
IView original page 11Page 12 · Read text
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3. With receptor head turned to desired posi-
tion, look through viewfinder and locate
subject area to be measured within bright
circle and push measuringbutton. lf neither
under- or overexposurewarning lamp lights,
adjust as ind icated. lf neither lamp lights,
releasemeasuringbutton after dial has stop- tu# ped moving, and read indicated exposure
f rom scaledesired.
ii,rView original page 12Page 13 · Read text
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Under- and Overexposure Warning Lamps and
High and Low Range Settings
1 0
lf underexposurelamp lights with h igh/low
range indicator set at H (high range) position,
turn high/low range selectordial until indicator Lighting of overexposure lamp with meter
boss is aligned with L (low range position) and set in high range indicates a light volume above
measure agaI n . meter's responserange.View original page 13Page 15 · Read text
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USE OF ACCESSORIES
Disk-Type Diffuser for llluminance Measuring 6. Convert reading to desired units by referring
t o s cale on back of meter (e.g.,an indicated
1. Screw diffuser into place on light receptor value of EV10 converts to 2500 luces or
7 2 head. 230 foot-candles.) 2. Set function selectorto lNC.
3. Set a f ilm speedof ASA 100.
4. With diffuser disk in desired position, push
measuringbutton.
Read value indicated on EV scafe.View original page 15Page 16 · Read text
www.ophancameras.com Pinpoint Receptor tor Measuring Light on Groundglass General 1. Screw threaded end of receptor into place on meter head (function selector may be at either INC or R E F; f ilm speed may, be at any setting).View original page 16
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To Determine (Subject or Lighting) Contrast To Read Exposure for Small Areas (Down to
Ratios approx. 3mm in diameter)
I 4 1. Use probe to measureareas as desired. 1. Calibrate for transmissionof each different
2. Find the number of steps' difference be- groundglassto be used.
tween readings on reference number scale. A. Use probe to measure brightness of
(lf a reading off one end of the scale is grou ndglass image of a solid-color,
indicated, continue counting steps with medium-brightness surface (such as a
index at other end of scale.) neutral-color wall or most preferably a
3. Determine approximate contrast ratio from standard gray card of 18 percent ref lec-
the following table: tance).
Approx' Brightness B. Preferably on color reversalfilm, make 6 steps' Difference on Ratio of Brighter trial exposures, f irst at the exposure ReferenceS^l^-")cale Area to Darker One ind icated by the meter (e.9., F8 at 1 l15
sec.) with each succeedingone only half
1 2 : 1 as great, i.e., 1 EV number less (e.g., FB at 113O,1160, 11125 and 11250,succes- 1-1l2 3 : 1 sively).
2 4 : 1 C. After f ilm has been processed,determine
3 B : 1 the most satisfactory trial frame and the
4 1 6 :1 number of stops' less exposure it re-
5 32:1 ceived than that directly indicated by
and so on. the reading with the probe (e.g., 3 stops
if best exposure was F8 at 1 1125 when
meter indicatedF8 at 1115).View original page 17Page 18 · Read text
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2. After making each subsequent reading with
probe on same groundglass, f ind correct
exposure by moving scale to set opposite
index a guide number that is largerthan the
one indicated by a number of stepsequal to
the number of stops' difference determine;
under lC above (e.9., 3 steps to the left
from guide number 3 to G to indicate an
exposure of F8 at 1160 if uncorrected
readingis F8 at 1/8).
The appropriate number of stops' corrective
adjustment can of course be set using the
EV scale or directly on the aperture and
shutter speed scalesif desired.
C A U T I O N:
It is important to ensure that extraneous
light from back or side does not influence
readingsthrough groundglasswhen using pin-
potnt receptor.View original page 18Page 19 · Read text
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Spot Mask to Determ ine Enlarging Exposure
1 . Screw mask into place on light receptor 3. Then project each following negative on
head (function selector may be set at either easel and, after adjusting image size and
I N C o r R E F ) . focus and setting lens to aperture to be used
1 6 2. To calibrate, make a satisfactory test en- for exposure, place spot on easel under a
largement without meter and set aperture med iumdensity area.
and time used to ma ke it on meter by 4 . Push measuringbutton.
turning film speedsettingdisk. 5. Read exposure time opposite aperture-scale
F-stop number at which enlarger lens is set.View original page 19Page 20 · Read text
www.ophancameras.com CARE AND STORAGE o Do not touch receptor surfaces; keep them l f y o u h a v e a n y q u e s t i o n s , a s k y o u r M i n o l t a clean by using a soft brush from time to dealer. He is knowledgeable in all aspects of time. lf they become soiled, remove loose photography, and he can help you with all of matter with a blower brush, then wipe you r photograph ic needs. gently with a soft cloth. o Do not subject your Autometer Professional to vibration or shocks. M i n o l t a C a m e r a C o . , L t d . 1 8 , 4 - c h o m e , S h i o - o The unit should never be placed or left in m a c h i d o r i , M i n a m i - k u , O s a k a , J a p a n glove compartment or other places in motor M i n o l t a C o r p o r a t i o n , 2 O O P a r k A v e n u e S o u t h , vehicles or elsewhere in wh ich it may be N e w Y o r k , N . Y . 1 0 0 0 3 , U . S . A . subject to relatively high temperatures. M i n o l t a C a m e r a H a n d e l s g e s e l l s c h a f t m . b . H . , Further, do not store it in humid places or 2 H a m b u r g ' 1 , S p a l d i n g s t r a s s e 1 , W e s t G e r - near corrosivechemicals. m a n y o lf the Prometer is left unused for more than a month, be sure to remove the battery. o When the unit is to be stored for a long time, it should ideally by placed in its original package and sealed in an air-tight container with an appropriate quantity of a dehumidifying agent such as silicagel.View original page 20
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