Minolta Booster II User manual

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BOOSTER
               OWNER'SMANUAL
               BEDIENUNGSANLEITUNG
             MODED'EMPLOI
              MANUALDEINSTRUCCIONES


         Er-I
   =rEt

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Your Minolta Booster II connectsto the Minolta Auto Meter II/IIVIIIF  or Flash Meter II/III
to greatly increasetheir versatility for specialized metering functions.  lf also increasesthe
sensitivity of the Flash Meter IIIIII. Attachments included with the BoosterII enable positive,
accurate measurementof actual brightnessat an SLR eyepiece,on an SLR focusing screen or
view camera groundglass,through the eyepiece of a microscope or telescope,or at the film
plane of a full-frame 35mm camera. The booster can also be used for conventional reflected
light measurementsof 60 degreesor greater.
   Before using the Booster II  for the  first time, please read this manual carefully whil6
installing the battery, handling and acquainting yourself with the attachments and features of
your booster. In this way, you can get correct readingsand begin to realize its potential right
from the start.

                  *

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NAMES OF PARTS               POWER SWITCH

    Compensationscale                           The M inolta Booster II  is equ ipped with twoo
    F ilmp lane measurement setting                power switches to help prevent battery drain.
   Max im um-sensitivitysetting                     Power switch A  activates the booster when@o
@ Ord inary reflected-light setting                  pressed;ten seconds later the booster is automati-
    (no attachmentsused)                              cally turned off. This feature is particularly useful
   Power switch B                           when making on ly  one  or two measurements.o
    Battery-chambercover                    When using power switch  A, make sure powei
    Light receptor                                 switch B is set to "OFF"@o                                                                                                                                                            t.
    Attachment mou nti ng th read                many measurements, slide power  switch B  to@o Receptor hood                                   For continuous measurementor when making -
   Connectingplug                                    after use.@o Power switch A                               "ON". Be sure to slide the switch back to "OFF"
@ Spot-probe attachment
(D Eyepieceattachment                   NOTE
(E M icroscope attachm ent                      When using power switch A, be sure to pressit
(D Film plane attachment                               for about one second or the power may not turn
                                                   o n .

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METERING ON VIEW€AMERA GROUND.
GLASS OR SLR FOCUSINGSCREEN

Flash Meter II When equipped with the spot-probe attach-
Set the measuring-modeselector of the meter ment, the Booster II enables the user of a view
so that "CORD" appears in the mode indication camera or of an SLR camera with an accessible
window. Pressthe meter'smeasuringbutton. lf the focusing screen to make precise reflected light
over-rangewarning lights or a number appears in readings of electronic or bulb flash or of continu-
the f-number readout window, the battery is ous illumination by measuringthe luminance oh
serviceable;if the under-rangewarning comes on, the focusing screen. Because the light reading is_-
replace the battery with a fresh one. taken at the film plane with view cameras,it is not-.
necessaryto make exposure correctionsfor bellows
Flash Metor III extension when taking close-upphotomacrographs.
Slide the measuring-modeselector of the meter (For close-up readings with SLR cameras see
so that "CORD" or "AMBl" appearsin the display "Metering through a bellows," p.17.1
window. Pressthe meter's rneasuringbutton. lf the Calibration with any of the four meters must be
over-range signal or an f-number appears in the done under continuous-light conditions. Even
display window, the battery is serviceable;if the when you plan to measure electronic or bulb flash
under-range warning appears, replace the battery with a flash meter, continuous-light calibration
with a fresh one. must be completed fi rst.

f i i l . , .

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Calibrating for view cameras
1 . Auto Meter II: Flash Meter II/III:
Set film speed and move the incident/ Note the measuring time and f-number in
reflectedselectorto "lNC." the display window.
AUIO MEtEr III: 6. Move the receptor hood back to its recessed
Set f i lm speed. position and screw the spot-probe attachment
Auto Meter IIIF: onto the Booster II.
Slide mode-selectorswitch to "AMBl" and 7. With the camera attached securely to a tripod,
set film speed. focus at infinity and point the lens at the same
Flash Meter II: surface as in step 4.
Set f i lm speed and move the measuring- 8 . Set the lens aperture at t15.6, or if the lens'
- mode selector so that "COR D" appears in maximum aperture is smaller than f 15.6,set the
the mode indication window. m ax im u m aperture.
Flash Meter III: 9 . Using a focusingcloth or other suitablematerial
Set the film speed and slide the measuring to shield the groundglassfrom stray light, place
mode selector so "AM B l" appears in the the tip of the spot-probe attachment f lat
display window. against the groundglass and push the meter's
2 . Plug the booster into the meter's accessory- measuring button.
receptor jack.
3 . Extend the booster's receptor hood as far as it
will go and turn the compensationdial so that
the index is opposite the "L".
4. Turn on the booster's power and point its light
receptor toward an evenly illuminated surface
(such as a wall or l8-percent gray card). Press
the meter's measuringbutton.
5 . Auto Meter II/ilI/IIIF:
Note the exposure value or the shutter-
speed/f-nu mber combi nation.
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Calibration for SLR cameras
10. Turn the compensation dial until the reading is CAUTION
the same as the one obtained in step 5. perform the calibration BEFORE loading film
Auto Meter II/III/IIIF: into your SLR camera.
Continue pressing the measuring button
while turning the compensationdial. 1. Auto Meter II:
Flash Meter II/III: Set film speed and move the incident/
Press the measuring button every time the reflectedselectorto "lNC."
compensation dial is moved to check each Auto Meter III:
new reading. Set fi lm speed. )
Record the setting obtained on the booster's Auto Meter IIIF:
compensationdial. Slide the mode-selectorswitch to "AMBI"
speed'
NorE ,.":llr':llrm
o lf the reading obtained in step 5 cannot be Set film speed and move the measuring-
matched even with the booster's compensation mode selector so that "CORD" appears in
dial set at "H", pleaserefer to p.21 . the mode indicationwindow.
o Becauselight transmissionthrough the ground- Flash Meter III:
glassmay not be uniform at different ooints on Set the film speed and slide the measuring
its surface, it is best to calibrate and .make mode selector so "AMBI" appears in the
readings at the same point when using the display window.
booster with the spot-probe attachment.

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2. Plug the booster into the meter's accessory- 7 . Turn on the booster's power and press the
receptor jack. meter's measuringbutton.
3 . Screw the film-plane attachment onto the Auto Meter II/II/IIIF:
booster and move the compensationdial so that Note the exposure value or the shutter-
the index is opposite the "C". speed/f-numbercombi nation.
4 . With the camera attached securely to a tripod, Flash Meter II/III:
focus on an evenly illuminated surface (such as Note the measuring time and the f-number
a wall or 18-percentgray card). in the displaywindow.
5 . Set the aperture ring of the lens to f/5.6 and 8. Remove the film-plane attachment from the
the camera's shutter-speedselector to "bulb". camera's film f rame aperture. U nscrew the
Open the shutter. attachment counterclockwise from the booster.
A lockable cable re{ease, such as Minolta's Close the shutter and the back cover of the
Cable Release II, can be used to hold the cam era.
shutter open. 9 . Screw the spot-probe attachment onto the
6. Open the back cover of the camera. Fit the booster. Using a focusingcloth or other suitable
raisedframe guide of the film-plane attachment material to shield the focusing screen from
into the camera's film-f rame aperture and press stray light, place the tip of the spot-probe
lightly to hold it in place. attachment flat on the focusing screen.

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1 0 . Set the aperture ring of the lens to f/5.6 and NOTE
use the stopdown button or lever on the lens o lf the reading obtained in step 7 cannot be
or camera body to close down the lens dia- matched even with the booster's compensation
phragm. With the camera focused on the same diaf set at "H" , pleaserefer to p.21 .
surface under the same illumination as that lf the focusingscreenor lens used in calibrating
measured in step 4, pressthe meter's measuring the booster is changed, the booster must be
button. recalibrated using the applicable combinatiogt
1 1 . Turn the compensation dial until the reading is to obtain proper exposure readings.
the same as the one obtained in step 7. Becauselight transmissionthrough the focusing'
Auto Meter II/III/IIIF : screen/groundglassor lens in use may not be'
Conti nue pressing the measuring button the same from the center to the edges, spot-
while turning the compensationdial. probe readings should be made, if possible, at
Flash Meter II/III: the same point at which the booster was
Press the measuring button every time the calibrated.
compensation dial is moved to check each
new reading.
Record the setting obtained on the booster's
compensationdial.

" i* *;^

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TMaering
To measure the light passing through a view- Auto Meter II:
camera groundglass or an SLR focusing screen, using the meter scales
proceed as follows: Auto Meter III/IIIF:
1. With the camera attached securely to a tripod, pressing the time increase/decreasebut-
focus on the subject and compose the picture. tons (with Auto Meter IIIF's mode-selec-
2. Set the lens aperture of the camera to f/5.6. lf tor switch at "AMBl")
the mdximum lens aperture of your view- Flash Meter II:
camera lens is smaller than f/5.6, set the using the indicated readings and the
maximum aperture. aperture/speedconversion dial found on
3. For view cameras,move the compensation dial the back of the meter
so that the index is opposite the setting found Flash Meter III:
in step 10 of the view-camera section. When by changing the shutter speed with the
using an SLR, move the dial to the setting meter set to "AMBl" mode
found in step 11 of the precedingsection. For electronic/bulb flash measurements:
4. Plug the booster into the meter's accessory- a. Set the proper flash-sync speed on the
receptor jack and turn on its power. camera.
5. Using a focusing cloth or other suitable material Auto Meter IIIF (electronicf lash only):
to shield the groundglass or focusing screen Slide the meter's mode-selector switch to
from stray light, place the spot-probe attach- "FLASH" (either 1/60 or 1/125 sec.).
ment flat on an image area of the groundglass Flash Meter II/III:
or focusing screen you wish to.reproduce as a Set the flash-sync speed and applicable
mid-tone. Press the meter's measuring button. mode (cord, non cord, or multi) on the
6. For continuouslight: meter.
From the obtained meter reading, select a b. Test fire the flash and set the camera
convenient shutter speed and aperture com- according to the meter readout.
bination.
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METERING THROUGH THE EYEPIECEOF SLR CAMERAS

Fitted with the eyepieceattachment, the booster can make centered,circular, through-the-lensexposure
readings through the eyepiece of an SLR. This is especiallyuseful for SLR cameraswithout built-in TTL
light-meteringsystems or when connected to the Auto Meter IIIF or Flash Meter II or III for TTL measure-
ments of electronic or bulb flash.

Cameras with manual stop4own mechanism 1. Auto Meter II:
Set film speed and move the incideni/
Calibration reflected selector to "lNC." /
Calibration with any of the f ive meters must be Auto Meter III:
done under continuous-lightconditions.Even when Set f ilm speed.
you plan to measureelectronicor bulb flash with Auto Meter IIIF l
a flash meter, continuous-lightcalibration must be Slide the mode-selectorswitch to "AMBl"
completed first. and set f ilm speed.
Flash Meter II:
CAUTION Set film speed and move the measuring-
Perform the calibration BEFORE loading film mode selector so that "CORD" appears in
into your SLR camera. the mode indicationwindow.
Flash Meter III:
Set the film speed and slide the measuring
mode selector so "AMBI" appears in the
displaywindow.
2 . Plug the booster into the meter's accessory-
receptor jack.
3 . Screw the f ilm-plane attachment onto the
booster and turn the compensation dial so that
the index is opposite the "C".

ii**lin;-. , ,

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4. With the camera attached securely to a tripod, 7 . Turn on the booster's power and press the
foius on an evenly illuminated surface (suchas meter's measuringbutton.
a wall or 18-percentgray card). Auto Meter II/ilI/IIIF:
5. Set the aperture ring of the lens to f/5.6 (or if Note the exposure value or the shutter-
the lens' maximum aperture is smaller than speed/f-numbercombi nation.
f15.6, set the maximum aperture). Set the Flash Meter II/III:
camera'sshutter-speedselector to "bulb". open Note the measuringtime and the f-number
the shutter. A lockable cable release,such as in the display window.
Minolta's Cable ReleaseII, can be used to hold For cameraswith a lens that has a maximum
the shutter open. aperturesmallerthan f 15.6:
6. Open the back cover of the camera. Fit the Auto Meter II:
raisedframe guide of the film-planeattachment Note the shutter speed opposite f/5.6.
into the camera's film-frame aperture and press Auto Meter III/IIIF; Flash Meter II/III:
lightly to hold it in place. Change the shutter speed so that f 15.6
- "';":ii'. appears in the display window. Note that
irult'
,i! \i;:. shutter speed.
8 . Remove the film-plane attachment from the
camera'sfilm aperture. Unscrew the attachment
counterclockwise from the booster. Close the
shutter and back cover of the camera.

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9 . Screw the eyepiece attachment onto the 1 1 . Turn the compensationdial until the readingis
booster and slide it over the camera's eyepiece the sameas the one obtained in step 7.
f rame.
1 0 . Set the aperture ring of the lens to f/5.6 (or to For cameraswith a lens that has a maximum
the maximum aperture if smaller than f/5.6) aperture smallerthan t 15.6:
and use the stop-down button or lever on the Auto Meter II:
lens or camera body to close down the lens Turn the booster's compensation dial until
diaphragm. With the camera focused on the the shutter speed noted in step 7 is oppositb
same surface under the same illumination as the lens'maximum aperture. /
that measured in step 4, press the meter's Auto Meter III/IIIF; Flash Meter II/IIIi .
measuringbutton. Set the shutter speed noted in step 7. Turn
the compensation dial until the f-number
equal to the lens' maximum aperture
appearsin the meter'sdisplay window.

Record the setting obtained on the booster's
compensationdial.

N O T E
lf the reading obtained in step 7 cannot be
matched even with the booster'scompensation dial
set at "H", pleaserefer to p .21 .

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Metering
1. With the camera attached securely to a tripod, Flash Meter II:
focus on the subject and compose the picture. using the indicated readings and the
2. Set the lens aperture to 115.6 (or to the aperture/speedconversion dial found on
maximum aperture if smaller than f/5.6). Use the back of the meter
the stop-down button or lever on the lens or Flash Meter III:
camera body to close down the lens diaphragm. by changing the shutter speed with the
3. Screw the eyepiece attachment onto the meter set to "AMBI" mode
booster and slide it over the camera's eyepiece For electronic/bulb flash measurements:
frame. a. Set the proper flash-sync speed on the
4. Move the compensation dial so that the index is camera.
opposite the setting found in step 11 of the Auto Meter IIIF (electronicflash only):
precedingsection. Slide the meter's mode-selectorswitch to
5. Plug the booster into the meter's accessory- "FLASH" (either 1/60 or 1/250 sec.).
receptor jack and turn on its power. Push the Flash Meter II/III:
meter's measuring button. Set the flash-sync speed and applicable
6. For continuouslight: mode (cord, non cord, or multi ) on the
From the obtained meter reading, select a meter.
convenient shutter speed and aperture com- b. Test fire the flash and set the camera
bination. according to the meter readout.
Auto Meter II:
using the meter scales
Auto Meter III/IIIF:
pressing the time increase/decreasebut-
tons (with Auto Meter IIIF's mode-selec-
tor switch at "AMBl")
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Cameras without manual stop-down mechanism

Calibration Flash Meter III:
Calibration with any of the five meters must be Set the film speed and slide the measuring
done under continuous-light conditions. Even mode selector so "AMBI" appears in the
when you plan to measureelectronic or bulb flash display window.
with a flash meter, continuous-light calibration 2 . Plug the booster into the meter's accessory-
must be completed first. receptor jack.
3. Extend the booster's receptor hood as far as lt
CAUTION will go and move the compensationdial so that
Perform the calibration BEFORE loading film the index is opposite the "L".
into your SLR camera. 4. Point the booster's receptor toward an euenly'
illuminated surface (such as a wall or 18-
1. Auto Meter II: percent gray card). Turn on the booster's power
Set film speed and move the incident/ and pressthe meter's measuringbutton.
ref lected selector to "lNC." 5. Auto Meter II/il/IIIF:
Auto Moter III: Note the exposure value or the shutter-
Set f ilm speed. speed/f-number combi nation.
Auto Meter IIIF: Flash Meter II/III:
Slide the mode-selectorswitch to "AMBl" Note the measuringtime and the f-number
and set film speed. in the displaywindow.
Flash Meter II: 6 . Move the receptor hood back to its recessed
Set film speed and move the measuring- position and screw the eyepiece attachment
mode selector so the "CORD" appears in onto the booster.
the mode indication window.

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7. With the camera securely attached to a tripod,
   focus on  the same surface under the same
   illumination as that measuredin step 4.
8. Slide the eyepieceattachment over the camera's
   eyepieceframe and pressthe meter's measuring
   button.
9. Turn the compensationdial until the readingis
   the same as the one obtained in step 5.
   Auto Meter II/ilI/IIIF:
      Continue pressing the measuring button
     wh ile tu rn ing the compensationd ia| .
   Flash Meter II/III:
      Press the measuring button every time the
      compensationdial is moved.
   Record the setting obtained on the booster's
   compensationdial.

NOTE
      lf  the lens used in calibrating the booster is
changed, the  booster must be  recalibrated to
obtain proper exposure readings.



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Metering
1. With the camera fastened securely to a tripod, Flash Meter II:
focus on the subject and compose the picture. using the indicated readings and the
2. Screw the eyepiece attachment onto the aperture/speedconversion dial found on
booster and slide it over the camera's eyepiece the back of the meter
f rame. Flash Meter III:
3. Move the compensationdial so that the index is by changing the shutter speed with the
opposite the setting found in step 9 of the meter set to "AMBI" mode
precedingcalibration section. )
4. Plug the booster into the meter's accessory- For electronic/bulb f lash measurements:
receptor jack and turn on its power. Push the a. Set the proper flash-sync speed on the
meter's measuringbutton. camera.
5. For continuouslight: Auto Meter IIIF (electronicflash only):
From the obtained meter reading, select a Slide the meter's mode-selectorswitch to
convenient shutter speed and aperture com- "F LASH" (either 1/60 or 1/250 sec.).
bination. Flash Meter II/III:
Auto Meter II: Set the flash-sync speed and applicable
using the meter scales mode (cord, non cord, or multi) on the
Auto Meter III/IIIF: meter.
pressing the time increase/decreasebut- b. Test fire the flash and set the camera
tons (with Auto Meter IIIF's mode- according to the meter readout.
selector switch at "AMBl")

;e"L',..- ..

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METERINGTHROUGH A BELLOWS    METERING THROUGH A MICROSCOPE
   For more  accurate metering when making
close-up photographs with  a bellows and SLR
camera, it  is best to calibrate the booster at each
centimeter graduation on the extensaon rail and
record the  result in graph form  to  follow  for
p reciseresults.





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With full-frame 35mm SLR and non-SLR cameras
2 . Plug the booster into the meter's accessory-
Calibration receptor jack.
Calibration with any of the f ive meters must be 3 . Screw the filmplane attachment onto the
done under continuous-light conditions. Even booster and turn the compensationdial so that
when you plan to measureelectronic or bulb flash the index is opposite the "C".
with a flash meter, continuous-light calibration 4 . With the camera and microscope adapter
must be completed f irst. securely attached to the microscope, place a
piece of tracing paper or similar material on the
CAUTI ON slide stageand focus on it.
Perform the calibration BEFOR E loading film 5 . Set the camera's shutter-speed selector to r-
into your SLR camera. "bulb" and open the shutter. A lockable cable /'
1 . Auto Meter II: release,such as Minolta's Cable ReleaseII, can
Set film speed and move the incident/ be used to hold the shutter open.
reflectedselectorto "lNC." 6. Open the back cover of the camera. Fit the
Auto Meter III: raisedframe guide of the film-planeattachment
Set f ilm speed. into the camera's film-frame aperture and press
AUIO MEtEr IIIF: lightly to hold it in place.
Slide the mode-selectorswitch to "AMBl"
and set f ilm speed.
Flash Meter II:
Set film speed and move the measuring-
mode selector so that "CORD" appears in
the mode indication window.
Flash Meter III:
Set the film speed and slide the measuring
mode selector so "AMBI" appears in the
display window.

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7. Turn on the booster's power and press the 9. When using an SLR-type camera, screw the
meter's measuringbutton. eyepiece attachment onto the booster and slide
Auto Meter II/IUIIIF: it over the camera's eyepiece frame. With
Note the exposure value or the shutter- non-SLR cameras,screw the microscopeattach-
speed/f-numbercombination . ment onto the booster, remove the micro-
Flash Meter II/III: scope's ocular, and insert the attachment into
Note the measuringtime and the f-number the microscope tube in place of it.
in the display window.

0. Pressthe meter's measuringbutton. Adjust the
compensationdial until the indicated readingis
the same as the one obtained in step 7. Record
the setting obtained.

8. Remove the f ilm-plane attachment f rom the NOTE
camera'sf ilm aperture. Unscrew the attachment lf the reading obtained in step 7 cannot be
counterclockwise from the booster. Close the matched even with the booster's compensationdial
shutter and back cover of the camera. set at "H" , pleaserefer to p .21 .

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Metering F O R S T R O B E :
1. llluminatethe specimenand focus on it. Reduce the light output by placing tracing
2. Move the compensationdial so that the index is paper or similar substanceover the flash guard
opposite the calibration value found in step 10 window or adjust the flash-to-subjectdistance
in the precedingsection. until f /5.6 is indicated.
3. When using an SLR-type camera, screw the
eyepieceattachment onto the booster and slide NOTE
it over the camera's eyepiece f rame. When Becausea reading of f/5.6 is below the Flash
metering for non-SLR cameras, screw the Meter ll's measuring range for film speed settingsz'
, microscope attachment onto the booster. Then of ASA 500 or over, the booster must be adjusted '
remove the microscope's ocular and insert the to yield an f-number within the meter's range when
attachment into the microscope tube in place using these film speeds. To do this, turn the
of it. compensation dial to the setting indicated in the
4. Turn on the booster's power and press the table for the film speed in use. Then turn the
meter's measuringbutton. measuring-timeselectoruntil the f-number indicat-
Auto Meter II: ed for this setting appears in the f-number readout
Set the camera's shutter .speed to the speed window. Set the camera's shutter to the speed
opposite f/5.6 on the meter's dial. shown in the measuring-timewindow.
Auto Meter III/IIIF; Flash Meter II/III:
Adjust the measuring time until f/5.6 is
indicated in the indication display window
and set the camera's shutter to the speed
shown in the measuring-timeindication.

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Minolta Booster II User manual

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