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Asahi Pentax MX
posted 2-29-'04
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SMC Pentax lenses and Pentax accessories are engineered and produced meticulously to precise Asahi Pentax specifications. Lenses and accessories from other manufacturers are not produced to these precise specifications and, therefore, may cause difficulties with - or actual damage to - a Pentax camera. Asahi Pentax cannot assume any responsibility for difficulties resulting from the use of any other brand of lenses or accessories with an Asahi Pentax camera.
CONTENTS
Nomenclature 2
Specifications 4
Lens Mounting 6
Inserting Batteries 7
Basic Operating Instructions 8
Film Loading and Winding 10
Setting ASA Film Speed 11
Setting the Shutter Speed Dial 12
Composing and Focusing 13
Exposure Measurement 14
Holding the Camera 15
Unloading Film 16
Flash Synchronization 18
Depth-of-Field Preview Lever and Scale 20
Depth-of-Field Table: SMC Pentax-M 50mm f/1.4 Lens 21
Meter Coupling Range 22
Helpful Hints on Exposure Problems 23
Dual Control Exposure System 23
Shutter Button Lock 24
Manual Shutter Operation 25
Self-timer 26
Infra-red Photography 27
Multiple Exposure 28
Interchangeable Focusing Screens 29
Using Screw-mount Takumar Lenses 30
Open-aperture and Stop-down Metering Lenses 32
Resistance to Temperature Extremes and Changes 33
Camera Maintenance 34
Warranty Policy 36
1. Exposure counter
2. Shutter button lock lever
3. Shutter-cocked indicator
4. Shutter release button
5. ASA window
6. ASA dial lock button
7. Shutter speed dial
8. Shutter speed index
9. Rapid-wind lever
10. Aperture read-out prism window
11. Hot shoe X contact
12. Film rewind knob/Back cover opener
13. Film rewind crank
14. Lens release lever
15. Self-timer lever/Depth-of-field preview lever
16. Upraised alignment dot
17. Focusing ring
18. Distance scale
19. Aperture/Distance index
20. Depth-of-field scale
21. Aperture ring
22. X-sync terminal
23. FP-sync terminal
24. Neck strap ring
25. Viewfinder eyepiece
26. Film pressure plate
27. Guide pin channel
28. Winder/Motor Drive direct contact terminal
29. Film chamber
30. Battery chamber
31. Motor Drive/Tripod receptacle
32. Film rail
33. Film guide rail
34. Shutter curtains
35. Film rewind button
36. Film transport coupler
37. Bulk magazine guide pin channel
38. Sprockets
39. Film take-up spool
40. Back cover
SPECIFICATIONS
Type
35mm full-frame SLR camera with open-aperture center weighted
Lens mount
Through-The-Lens meter.
Pentax K bayonet.
Standard lenses
SMC Pentax 50mm f/1.2
SMC Pentax-M 50mm f/1.4
SMC Pentax-M 50mm f/1.7
SMC Pentax-M 40mm f/2.8
Shutter
Horizontal-run, rubberized silk focal-plane shutter; speeds from 1
Flash synchronization
to 1 /1000 sec. plus B; shutter lock and "Cocked" indicator.
FP and X sockets, plus hot/cold accessory shoe for X contact; 1/60
sec. X synchronization.
Self-timer
Delays shutter release t04- 12 seconds; self-timer starter button provided.
Viewfinder
Silver-coated pentaprism finder; split-image microprism focusing screen (8 interchangeable screens); 95% of picture-taking area visible
and 0.97X magnification with 50mm lens at infinity); -1.0 diopter
eyepiece. Information viewfinder shows f/stop, shutter speed and
tri-colored LED read-out dots. Correction lens adaptor M, Magnifier
M and Refconverter M fit the viewfinder frame.
Mirror and diaphragm
Instant return mirror and automatic diaphragm. Depth-of-field preview with self-timer lever.
Film wind and rewind
Ratchet-type rapid wind lever, plastic-tipped for winding comfort. www.4butkus.org
162° throw with a stand-off angle of 20°. Rewind crank for
speedy film rewind.
Film loading
New magic-needle quick/sure loading.
Automatic winder
MX camera body accepts Winder MX for up to 2 frames-per-second
Exposure counter
(single-frame and consecutive exposure operation possible) and
Motor Drive MX for up to 5 frames per second (single-frame and
consecutive exposure operation possible), for automatic, speedy
film wind and shutter cocking.
Automatic reset type.
Exposure meter
Open-aperture, center-weighted Through-The-Lens meter, with
Power source
GPD cells for fast light response, with tri-colored LED exposure
read-out, rapid wind lever and shutter release button acting as meter
switch. Exposure range: EV1 - 19 (ASA100, f/1.4), Film speed
range: ASA25. 1600.
Two 1.5V silver oxide batteries (G13); LED's double as battery check lamp.
Back cover
Standard back with memo holder, interchangeable with Magazine
Body size
Back MX, Dial Data MX for data recording on film.
135.5mm x 82.5mm x 49.5mm.
Body weight
495 grams.
LENS MOUNTING INSERTING BATTERIES
1. Remove the rear lens and body caps.
2. Match the red dot on the camera body with the red dot on the lens. Insert the lens into the body and turn it clockwise until the lens locks with a click.
3. In the dark, when the red dots are difficult to see, align the upraised white dot on the lens barrel with the lens release lever by touch. Then turn and lock as above.
4. To detach, hold the camera with your left hand. Depress the lens release lever while turning the lens counterclockwise with your right hand. www.4butkus.org
CAUTION: If you have to put the lens down without the rear lens cap, place place it front-element down never front element up.
BATTERIES
Two silver oxide batteries are packed separately. Be sure to insert them into the battery chamber before operating the camera.
CAUTION: The battery is like a phonograph record, it can be damaged by skin acids. Handle by the edges with a dry cloth before insertion into the camera. Also be especially sun to wipe off the battery with a cloth when they are salted. The battery is not rechargeable Do not throw a dead battery into a fire, as it may explode. Also keep it beyond the reach
children.
INSERTION: Open the battery chamber cover with a coin. Insert the two batteries into the battery holder of the cover as shown above, each with (+) side facing up.
CHECK: One set of batteries will last about one year, or operate the shutter about 10,000 times. To check battery life, depress the shutter release button halfway, while looking through the viewfinder. If the batteries are dead, the LED dots will not glow. For replacement, use
Eveready S76E or Mallory MS76H or equivalent.
BASIC OPERATING INSTRUCTIONS
1. Set Film Speed
While depressing the tiny button atop the shutter dial, turn the rim of the shutter dial until the ASA number of the film you are using is centered in the ASA window.
2. Cock Rapid-Wind Lever
Cock the rapid-wind lever all the way until it stops. The "Cocked" indicator will turn red, showing that the shutter is cocked.
3. Set Shutter Speed
Turn the shutter speed dial until the speed you want to use is opposite the index mark. Generally, you should use the fastest possible shutter speed to avoid blurred pictures caused by camera movement. Try starting with 1/125 sec. outdoors in daylight and 1/30 sec. indoors. www.4butkus.org
4. Composing and Focusing
While viewing through the finder, turn the focusing ring until your subject comes into sharp focus and choose the most pleasing composition.
5. Turn on Exposure Meter and Rotate Aperture Ring
Pull out the rapid-wind lever slightly (20°) and depress the shutter release button halfway to turn on the exposure meter. The preselected shutter speed plus the two adjacent speeds ("60" and
"250" in the case of "125") are visible on the right-hand side of the viewfinder. Turn the aperture ring until the central green LED dot glows which indicates proper exposure. (The f-stop you have selected is also visible in the small window above the focusing screen). If the central green dot does not glow no matter how far you turn the aperture ring, change the shutter speed.
6.Release Shutter
Hold your camera firmly and trip the shutter. Then cock the rapid-wind lever for the next picture. (As long as the lever is at its pre-advance angle, the light meter stays ON. If you push it back to the completely closed position, the meter is turned OFF.)
FILM LOADING AND WINDING SETTING ASA FILM SPEED
1. Open the back by pulling up the rewind knob until the back opens.
2. Place the film cartridge in the film chamber, and push down the rewind knob. Insert the film leader in between any of the white plastic pins surrounding the film take-up spool.
3. Advance the film by alternately advancing the rapid wind lever and depressing the shutter button until both top and bottom sprockets engage the film perforations. Close the back by pressing it firmly.
4. Cock the rapid-wind lever, and confirm that the film rewind knob turns counterclockwise, indicating that the film is properly loaded and is moving from cartridge to take-up spool. Trip the shutter. Advance the film until the exposure counter turns to "1 ", indicating that the first picture is ready to be taken.
SETTING THE ASA FILM RANGE
MEMO HOLDER
As a reminder of the type of film in your camera, tear off the top of the film box and insert it into the Memo Holder on the back of the camera.
The ASA film speed rating of all 35mm films is given in the data sheet packed with each roll of film. The higher the ASA number, the more sensitive the film is to light. While depressing the ASA dial lock button, turn the rim of the shutter dial until the ASA number of your film is aligned with the index mark.
Be sure to set the ASA film speed because it is coupled to the exposure meter system. www.4butkus.org
SETTING THE SHUTTER SPEED DIAL COMPOSING AND FOCUSING
Turn the shutter speed dial clockwise or counter-clockwise to the shutter speed desired. The shutter speed may be set either before or after cocking the rapid-wind lever. As you cock the shutter by turning the rapid-wind lever, the "cocked" indicator turns red showing that the shutter is cocked. The color of the cocked indicator changes to black after tripping the shutter. For use of the X setting on the shutter speed dial, refer to page 18.
With the shutter speed dial set on B (bulb), the shutter will stay open as long as you depress the shutter button. As you release your finger from the shutter button, the shutter closes. When a long exposure is desired while using the 8 setting, set the shutter button lock by moving the lever to the left (an "L" becomes visible) while depressing the shutter button. Alternately, use a cable release with a locking device for a time exposure.
CAUTION:
At long speeds, longer than 1 /30 (1/15 - 1 sec.) support your camera rigidly to prevent camera movement. To protect the shutter mechanism, trip the shutter before putting the camera away for any extended period.
COMPOSING AND FOCUSING
The standard focusing screen of your MX has a central split-image circle surrounded by a microprism collar. While looking through the viewfinder, turn the focusing ring until your subject comes into sharp focus. If your subject is not in focus, the image in the split-image circle will appear divided into upper and lower portions, and the image in the microprism collar will appear broken into many small fragments.
EXPOSURE MEASUREMENT
When the rapid-wind lever is pulled out 20° and the shutter button is depressed halfway, the exposure meter is turned ON. Turn the aperture ring to get a proper LED exposure read-out in the viewfinder.
On the right-hand side of the viewfinder, appear the preselected shutter speed plus two adjacent speeds (e.g. "60" and "250" in the case of "125") on a transparent disk which protrudes slightly into the focusing screen area.
On the right-hand side of the shutter speeds shown, there are 5 LED dots which are normally not visible. If you depress the shutter button halfway and the exposure is correct, the central green dot will illuminate. If the exposure is 1 /2 EV over, the orange dot next to "250" (in the above example) will glow; as will the dot next to "60" in the case of 1 /2 EV underexposure. If it is 1 EV or more over or under, the appropriate red dot will glow as a warning for adjustment of either the f-stop or the shutter speed, unless you want to make intentional over or underexposure.
As a general rule, your camera can be held more firmly in the left hand, which does not release the shutter. If you hold your camera with the right hand - the hand that releases the shutter - this may cause camera movement. Often, blurred pictures are due to camera movement. www.4butkus.org
HOLDING THE CAMERA
Horizontal position
Hold the camera firmly with your left hand, and draw your arms close to your body
Vertical position
Hold your camera tightly to your forehead with your left hand, and draw your right arm close to your body.
Vertical position
Hold your camera tightly to your forehead with your left hand, raise your right arm and draw your left arm to your body.
UNLOADING FILM - AVOID DIRECT LIGHT WHEN UNLOADING THE FILM
After the final picture on the roll has been taken, the rapid-wind lever will not advance further, indicating that the film must be rewound. Lift up the rewind crank. Depress the film rewind button and turn the rewind crank as indicated to rewind the film into its cartridge. Rewind until the tension on the crank lessens, indicating that the leader end of the film has been released from the take-up spool. Pull out the film rewind knob (
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