Miranda Sensorex
Posted on April 28, 2003

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For reference use on many Sensorex manual focus and metering cameras

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    We thank you for selecting our MIRANDA Sensorex as your companion and hope that it gives you much pleasure and satisfaction for a long time to come.

    As the pioneer of single-lens reflex in Japan and as a specialized manufacturer of this type of camera, the Miranda Camera Company has been continually developing its products with new ideas and great originality.

    MIRANDA Sensorex which has become your companion from today offers a new standard for quality cameras. It provides the advantage of through-the-lens light measuring at open aperture, closed aperture or through selective spot or average reading, and is equipped with a lens of an extremely high resolution, a bright and easy-to-use viewfinder. With a wide interchangeability of both viewfinders and lenses, and distinctive features found only on high grade cameras, it rightly deserves being called the perfect SYSTEM CAMERA.

    It has, moreover, a built-in self-timer, an almost noiseless shutter and vibration-free mirror mechanism, a compact easy-to-hold body, and a complete line of convenient accessories to suit all occasions.4www.butkus.org

    We firmly believe that it is able to meet any requirements of the amateurs or professionals.

    Before taking your first picture, however, we earnestly advise you to read this Manual carefully as it would enable you to make best use of the remarkable capabilities of this MIRANDA Sensorex Camera.

CONTENTS

I. Name of Parts

2. Special Features of MIRANDA Sensorex

3. Outline of Camera Operation

4. Film Loading

5. How to Use Film Advance Lever

6. Setting the Shutter Speed

7. Setting the Lens Aperture

8. How to Use Cds Meter

9. Automatic Diaphragm and Depth of Field Preview Lever

10. Quick-Return Mirror

11. Picture Composition and Viewfinders

12. Adjusting the Focus

13. How to Hold Camera and Press Shutter Button

14. Shooting at Slow Speeds

15. Self-Timer Operation

16. Shooting with Flash

17. Film Rewinding

18. Depth of Field

19. Lens Interchanging

20. MIRANDA Interchangeable Lenses

21. MIRANDA Sensorex Accessories

22. MIRANDA Sensorex technical data



SPECIAL FEATURES OF MIRANDA SENSOREX

 
  1.. The Superb 50mm fl.8 AUTO MIRANDA Len

     AUTO-MIRANDA 50mm f/l.8 lens is a fully automatic diaphragm lens embodying Miranda's highest technique and enjoying the highest reputation in all parts of the world It is a large aperture Gauss type lens of 6-element 4-group construction, which gives sharp definition even at wide open aperture and is totally free of any focus-shift at the smallest aperture. Moreover, as it is perfectly corrected for aberrations, it yields sharp images of the main subject and makes it therefore most suitable for color pictures.4www.butkus.org


2. AUTO Miranda 50mm f 1.4

     A new high speed 50mm fI.4 standard Auto Miranda lens has been developed for use on the Miranda Sensorex. It is a gauss type lens, consisting of 8 elements in 6 groups, diaphragm calibrations from 1.4-I 6, minimum focusing distance is 43 cm or 17 inches. Angle of view is 45°. It is advisable to use a lens hood with this lens to avoid reflection on the front element.


3. Instant-Return Mirror

     One of the advanced features of the MIRANDA Sensorex is the instant-return mirror. When the shutter release button is pressed, the mirror swings up, permitting the light rays from the lens to reach the film as the focal plane shutter opens. Immediately after the film is exposed, the mirror returns to the viewing position. When the mirror is up, the view through the viewfinder is momentarily blacked out, but, at speeds of I/I 5 second and faster, the mirror returns to the viewing position so quickly that the photographer hardly notices the interruption.

 
4. Convenient Interchangeable

Viewfinder
     For an SLR system to manifest its fullest capacity, it is absolutely necessary that its viewfinder be interchangeable with other types. MIRANDA Sensorex has this capability. For close-up, copying and low-angle shooting, its penta-prism viewfinder can be interchanged with three types of viewfinders. Selective use of these viewfinders assures utmost convenience in taking pictures of special effects under all conditions.


5. Variable CdS Sensing Area  

     The CdS sensing area is positioned behind the mirror right in alignment with the optical axis, for precise light reading. The sensing area occupies only 5% of the mirror.

 



6. Unique Type of Lens Mount

     The lens mount of MIRANDA Sensorex has on its outside a 4-claw bayonet mount and on its inside a screw mount of 44mm inner diameter (All MIRANDA cameras and lenses have the same standard lens mount).

     The bayonet mount is for attaching the auto lenses (having automatic diaphragms) extension bellows, etc., quickly and easily by merely giving I/8 of a full turn after mounting. The inner screw mount is for preset lenses and most of other accessories.

     As the Miranda mount has a wide diameter and a short flange back (distance between lens attaching plane and film surface), it permits the use of most lenses made for other SLR cameras by means of Miranda adapters.

 

7. Bright, Easy-to-View and Accurate Viewfinder

     MIRANDA Sensorex is equipped with a penta-prism viewfinder which shows the subject's image right side up and right way round. It was Miranda Camera Company which first developed and adopted this system in Japan. It was Miranda also which first perfected a method of improving the penta-prism's eyepiece to permit easier viewing.

     Miranda's viewfinder accurately shows the actual image and background blurs exactly as transferred to the film, and is therefore most useful in portraits, close-ups, copying and color shots, and particularly when shooting with telephoto lenses or through the microscope4www.butkus.org



8. Complete Line of Interchangeable Lenses and Accessories

     MIRANDA Sensorex is one of the highest grade SLR cameras embodying many outstanding features within its compact easy-to-use body, but furthermore, it is provided with 19 interchangeable lenses ranging from 25mm to 800mm focal lengths, along with a full assortment of useful accessories to make it deserve being called the full-scale System Camera. Besides ordinary shooting, it boasts of remarkable versatility in close-ups, copying and photomicrography in the fields of science, medicine, industry, education and other activities.


OUTLINE OF CAMERA OPERATION

1. Open the back cover

While pressing lock button pull up clip lever at ton to open back cover.

2. Load the film

Insert film cartridge, with the spool projection facing down.

3. Set the ASA speed indicator

 


4. Wind film advance lever

Continue winding until film counter shows figure " I".

 

5. Set the lens selector dial and turn on the meter switch

 


6. Obtain exposure by looking through viewfinder

While looking through the viewfinder turn shutter speed dial or diaphragm setting lever until the needles coincide.4www.butkus.org


7. Adjust the focus

Turn focusing ring until the jagged glitter disappears from the center focusing spot.


8. Decide the composition by looking through viewfinder and gently press shutter button.


 
FILM LOADING

· Always load or unload the film in the shade. If no shade is available, do it in the shadow of your own body.

· Whenever possible, avoid loading and unloading in a dusty place or at the seaside where strong salty wind is blowing.

· When loading or unloading, take care not to touch the shutter curtains.

 

     The 35mm film is advanced through rotation of the sprocket and not by direct winding of the spool; therefore, the sprocket must engage the film's perforation perfectly. To check whether the film is advancing properly, the rewind knob is first turned slightly to take up any play in the film; then if the advance lever is wound the rewind knob should rotate. But if the rewind knob fails to turn it indicates that the film is not properly loaded and requires reloading.

 

     As soon as you have loaded the camera, be sure to adjust the ASA speed indicator (ASA 25--1600) on the shutter speed dial to the ASA speed of the film you have loaded. Lift the shutter speed dial and rotate it until the required ASA speed is opposite the indicator mark. Setting the ASA speed is essential to exposure determination since the ASA speed indicator is cross-coupled to the meter needle in the viewfinder, along with the diaphragm and the shutter. If the ASA speed is not correctly set, the built-in CdS exposure meter will not indicate correct exposure settings.

 

 

1. Open the back cover
      Press lock button in the center of right edge of back cover and pull up clip lever at top at the same time, which immediately opens the back cover. When back cover is opened, counter automatically returns to "S" (start) mark.


2. Insert cartridge into film chamber

     Pull up rewind knob and insert cartridge, taking care that the projecting end of cartridge faces down.4www.butkus.org


3. Push back rewind knob to original position

     If the knob does not go all the w ay down turn it a little to the left or right.





 
4. Position take-up spool slit
     Turn the bottom knurled flange of take-up spool with a finger until slit appears.

 

5. Insert tip of film into spool's film slit
     Insert end of film making sure that one perforation is caught by the claw at the entrance of the film slit. Also see that the sprocket engages the film perforation.
6. Turn film advance lever until perforations on both sides of film are engaged by the sprocket
     If one winding fails to make sprocket catch the perforations on both sides of the film, press shutter button and wind again.

 
7. If film is advancing properly, close back cover
     Upon closing, push down clip lever, which will automatically engage the lock button and the back cover becomes securely locked

 

8. Turn film advance lever several times to wind up the fogged portion of film
     Shoot several blanks and continue winding the film until film counter indicates ''I''. Then, slightly turn rewind knob in the direction of arrow to take up any slack.
9. When film counter indicates "1" it means film loading is completed.
      From here, film counter will move e frame by frame for each shot to indicate the number of pictures which have been taken.

 


TO USE FILM ADVANCE LEVER--

Before winding (WHITE)
Turn film- advance lever until it goes no further. One full turn of I80 is necessary to advance one frame. Insufficient winding may make the shutter button unworkable, or even if it does work it may not permit proper opening of the shutter curtain. This point requires careful attention.

      One full winding also cocks the shutter and changes the color in the signal window from white to red. It returns to white again when 4 the shutter is released.

After winding (RED)
One full winding of film advance lever:
I. Advances one frame of film.
2. Makes film counter advance one number
3. Changes color in signal window from white to red.
4. Cocks the shutter.
5. Sets the automatic diaphragm of lens and mirror mechanism.4www.butkus.org


SETTING THE SHUTTER SPEED--
To set the shutter speed, the shutter speed dial is turned to the left or right until the desired speed number lines up with the shutter speed indicator. The dial rotates in either direction.

The marks "B. I, 2....... 1000" indicate" indicate Bulb, I sec., 1/2 sec ....... ...... 1/1000 1/1000 sec. shutter speed positions.

· The red "60" indicates the shutter speed for synchronization with electronic flash.

· Shutter speed can be freely changed before or after winding.

 When turning the shutter speed dial, see that it falls correctly into click stop position. If set to intermediate positions, the shutter will not operate at an accurate speed.



S APERTURE I

· Adjustment of the aperture scale to a point midway between the settings would give an intermediate f-value.

· The aperture may be set either before or after film advance.
Because the diaphragm mechanism of the MIRANDA Sensorex is coupled to the metering system, refer to sections on the CdS exposure meter and method of light measurement for further details on aperture setting.
The aperture scale of the standard lens has calibrations from f/I.8 (I.4) to f/I6. To adjust the aperture according to the light intensity, shift the aperture setting lever in either direction. The red indicator on the lens mount or the diaphragm setting lever is used for reading the aperture setting.

· The larger the aperture value the less light is transmitted to the film plane. The calibration on the scale is arranged so that setting to the next larger value reduces the volume of incoming light by half. If, there fore, the scale is adjusted in succession to the next larger value, the volume of light transmitted through the lens would be decreased in progression of 1/2 I/4, I/8, 1/16 and so on.4www.butkus.org


How to Use the CdS Meter

1. Mercury Battery
The CdS meter of the MIRANDA Sensorex  is powered by a mercury battery. Before using your new Sensorex, therefore, load the mercury
battery which is supplied with it in the battery compartment of the camera.

I. Take off the battery compartment lid of the camera by turning it in a counterclockwise motion.
2. Place the mercury battery in the compartment, seeing to it that the (+) side faces the camera back, and close the lid.
3. The meter will be activated by turning on the meter switch.

· The meter will not function if the polarity of the mercury battery is reversed.

 

· Under ordinary circumstances, the mercury battery will provide sufficient power to work the meter over a duration of about two years. The battery power declines sharply when it nears the end of its life-span, resulting in sluggish movement of the meter needle seen through the finder. In this case, replacement of the mercury battery is necessary.

· When replacing the mercury battery, use Mallory # 625 or equivalent.

· Remove the mercury battery from its compartment when the camera is to be left unused over any great length of time.

2. Setting the Film Speed
The CdS meter of the MIRANDA Sensorex is coupled to the film speed dial. After loading the film, therefore, see that the film speed dial is set properly. Failure to adjust this dial according to the speed rating of the film loaded in the camera will prevent the meter from giving correct exposure reading.

· Lift and turn the knurled outer ring of the shutter dial in either direction until the desired figure comes directly opposite the indicator.
· It is unnecessary to re-adjust the film speed dial unless film of a different speed rating is loaded in the camera.
· The same film speed setting is employed when using filters or in close-ups and photomicrography.
· Intermediate settings on the dial denote film speeds given in the illustration.

3. Switching on the Meter
The CdS exposure meter is activated by pushing toward the camera front the meter switch located on the base of the film rewind knob.

· The meter switch has click stop to prevent it from accidentally slipping out of position.

· The On/Off indicator is on the flash synchronizer selector. Regardless of whether the flash synchronizer selector is set to FP or X, the indicator will show at a glance whether the switch is turned on or off.4www.butkus.org


· Be sure to adjust the flash synchronizer selector accurately to the click stop settings at FP or X. Failure to do so will prevent the On/Off indicator from giving the On or Off setting accurately.
· It is unnecessary to turn off the meter switch after each exposure; however, to prevent battery drain, it is advisable to shift the lever to Off position when the camera is to be left unused.

4. Open Aperture Light Measuring

    The MIRANDA Sensorex is the only camera in the world permitting open aperture light reading with either exclusive Miranda lenses or other brands of preset diaphragm lenses. The method employed in light measurement is basically the same with any of these lenses.
· The exposure computer system of the MIRANDA Sensorex is adjusted perfectly to the Auto-Miranda lens or other preset diaphragm lens in use, simply by setting the lens selector dial on the camera front according to the maximum aperture of the lens. If, for instance, a 50mm f/I.8 lens is mounted on the Sensorex, turn the dial until the figure I.8 appears in the window.

The lens selector dial has the following settings:

1.4 - 1.8 - 2.8 -  3.5 -  4 - 5.6 -  8

    The CdS meter of the MIRANDA Sensorex is cross-coupled to the shutter speed and diaphragm mechanisms. Therefore, exposure is determined according. to one of the following methods:

1. An appropriate shutter speed is pre-selected and the diaphragm setting lever is turned until the two needles in the finder are matched perfectly.

2. By pre-selecting the lens aperture, the meter needles are matched by turning the shutter speed dial.

3. In case of preset diaphragm lenses, the diaphragm setting lever is manipulated and the aperture reading where the two needles coincide is then transferred to the aperture scale of the lens.

5.- Closed Aperture Light Measuring
 In ordinary situations, the open aperture light reading is more convenient as it enables bright viewing of the subject area and also effectively provides against inaccuracy of light measurement resulting from strong backlight entering through the viewfinder eyepiece. Nevertheless, closed aperture light reading is necessary in photomicrography or when using lenses of undeterminable f-number.

    The method of closed aperture light reading is identical with any type of lens used.
1. Adjust both the lens selector dial and diaphragm setting lever of the camera to f/1 .4.

2. Stop down the lens to the required aperture and match the needles by turning the shutter speed dial.

3. Take every precaution against backlight entering from the viewfinder eyepiece. Because the light transmitted through the lens in case of closed aperture light reading is often weaker than the backlight, error in exposure reading is liable to occur. To prevent errors in light reading, therefore, the use of the eyecup is recommended.4www.butkus.org

 

6. Partial Average System
 

The Sensing area of the CdS meter of the Miranda Sensorex is placed behind the mirror in alignment with the optical axis of the lens in use, always in position for exposure reading, except for the split second action of the mirror when taking a picture.
    The exposure meter measures an average of a part of the image, eliminating the light-influence of the sky, which could cause over exposure of the picture, especially when color film is used. This light-measuring is performed in a unique way. The single CdS-cell, behind the mirror, in actual fact is composed of 3 separate super sensitive light measuring elements, positioned in the upper portion and left and right side of the mirror.

    As the mirror is placed in the camera at a 45 degree angle, the reflected image in the viewfinder covers the area as shown in the pictures. When photographing it is therefore a prerequisite to have the main subject in the area, covered by the exposure meter,


   

7. Convenient, Efficient Cross Coupled Match-Needle System

    The CdS meter incorporated in the MIRANDA Sensorex is of the match - needle type permitting speedy, accurate light measurement. It is moreover cross-coupled to the shutter and diaphragm mechanisms. By looking through the viewfinder, you can see at a glance whether the prevailing light is sufficient to guarantee correct exposure without extra adjustments. Moreover, since the meter is cross-coupled, light reading can be done through pre-selection of either the shutter speed or lens aperture, depending on the method preferred by the user.
· Aim the camera toward the subject and while looking through the viewfinder turn the shutter speed dial or diaphragm setting lever until the follower needle (with 0 on the tip) coincides with the meter needle. This simple procedure enables accurate light measurement.
To obtain special effect by doubling the exposure, match the upper curve of the O to the meter needle. To decease the exposure by one setting, match the lower curve of the O to the needle.

 · When in case of aperture pre-selection method the needles fail to coincide even when the shutter speed dial is turned, set the shutter speed to the closest setting and then turn the diaphragm setting lever until the needles are perfectly matched. Do not under any circumstances adjust the shutter - speed dial to an intermediate setting.
 


AUTOMATIC DIAPHRAGM AND DEPTH-OF FIELD PREVIEW LEVER.


 ·  The fully automatic diaphragm of Miranda lenses is of special construction which keeps the lens wide open all the time to provide a very bright viewfinder image for easy picture composition and speedy adjustment of focus.

· When the shutter button is pressed, the diaphragm automatically closes down to the aperture to which the lens has been set beforehand and makes it work only at that aperture. But when the shutter closes, the diaphragm automatically reopens.

· The viewing can therefore be done at fully open aperture at all times. But if one desires to actually check the effects of a given aperture on the image, the special lever on the lens barrel can be used. This preview ; lever when depressed stops down the diaphragm temporarily to the aperture which has been pre-selected so that the depth of field and background blurs can be directly checked.

· Miranda's fully automatic diaphragm system is used not only in the standard 50mm lens but also in all other Auto-Miranda lenses. As with the standard lens, they permit viewing at full aperture, no matter what f-stop has been pre-set for the actual shooting. In snapshots particularly, it saves the trouble of having to open the aperture for focusing and to close it down for the shot.4www.butkus.org

· When changing the lens, it makes no difference whether the aperture is stopped down or not, for once it is mounted on the camera the aperture automatically opens fully.



    The mirror is of course of the quick-return type which causes an extremely short viewfinder black-out during shutter action. Due to its original construction, the mirror mechanism on MIRANDA Sensorex is particularly quick acting and the viewfinder black-out at shutter speeds of 1/15 second or faster lasts no longer than the blinking of an eye.

· The coupled action between the automatic diaphragm and the mirror too is very smooth, so that when the shutter button is pressed:

(I) The diaphragm closes down to the preset aperture,

(2) Almost simultaneously the mirror swings up,

(3) Followed by opening of the shutter curtains and film exposure

(4) Then, the shutter closes, mirror returns to normal position and the lens diaphragm re-opens fully.

All the above actions are instantaneous.

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