Modern Classic SLRs Series :
Canon T90 - Camera Instruction Manual

Part XIV

Shooting with the Lens off "A" Mark


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Manual Override
 

l ) Set the display panel to "tv".

2) Set the desired shutter speed by turning the
electronic input dial.

3) Remove the lens from the "A" mark. An " CD "
will then be displayed on the display panel.

4) Set the desired aperture value to the lens manually, referring to the aperture displayed in the viewfinder. You must rely on your own experience for setting the exposure.
This is a creative mode in which you can control exposure by setting both the shutter speed and the aperture as you like.

Stopped-down AE
 

1 ) Set the display panel to any one of "Av", "P",
or "Program".

2) When using an FD lens, remove the aperture ring from the "A" mark.

3) Set the desired aperture value to the lens
manually.
It is necessary to use the stopped-down AE mode when using close-up accessories which have no FD signal pins, such as extension tubes or bellows in combination with an FD lens. You can take a picture while confirming the depthof-field by pushing in the stop-down lever. This mode is also useful when using the Canon Reflex Lens or FL lenses and when using simple FD lenses.  

4) Push in the stop-down lever. A " A'' mark
will then be displayed on the display panel.

5) The camera sets the shutter speed automatically according to the apertu
If your eye will not be at the viewfinder the moment you press the shutter button, close the eyepiece shutter by pushing the eyepiece shutter lever, to avoid stray light from entering.

When using the stopped-down metering with an FD lens attached directly to the camera body, use an aperture of f/2.8 or smaller.

<Checking Depth-of-Field >
When you check the depth-of-field with the FD lens, stop down the aperture by pushing in the stop-down lever as mentioned above. When you look through the viewfinder with the lever pushed in, you can see the range of sharpness i.e. the depth-of-field.


< Error Display >
When you use the stopped-down AE mode with the FD lens, do not push in the stop-down lever with the lens set on the "A" mark. If you do "E" marks indicating an error will appear to warn you of incorrect operation (EEEE EE in the viewfinder and EEE on the display panel), and the shutter is locked. In this case, either push in the stop-down lever again to clear the stopped-down AE or remove the lens from the "A" mark. The error display will then disappear.



Stopped-down (Fixed Index) Metering
 


The shooting objectives of this mode are the same as for stopped-down AE mode, but this mode needs manual operation.

1 ) Set the display panel to "Tv".
2) Set the desired shutter speed by turning the
electronic input dial.
3) When using an FD lens, remove the aperture ring from the "A" mark
4) Push in the stop-down lever. An "@" mark
will then be displayed on the display panel.
5) Check the exposure in the viewfinder.

In the viewfinder, any one of "OP", "oo", or "CL" is displayed as well as the shutter speed you have set. The meaning of each display is as follows:

0P: underexposure (Open the aperture.)
oo : correct exposure
CL: overexposure (Close the aperture.)
6) Turn the aperture ring of the lens until the "oo" is displayed.

7) Press the shutter button.
To the right of the viewfinder, "<" dot is displayed and it moves upward or downward as the aperture is changed. When the "oo" mark is displayed at the bottom of the viewfinder, the "<" is aligned with the triangle index.
If the " OP" is still displayed when the aperture ring is turned to the maximum aperture of your lens, set a slower shutter speed on the display panel.

If the " CL " is still displayed when the aperture ring is turned to the minimum aperture of your lens, set a faster shutter speed.

* Notes for this mode and the situations in which the error is displayed are all the same as for stopped-down AE mode.
underexposure display: indicates that the aperture must be opened.
overexposure display: indicates that the aperture must be closed.

< Manual Diaphragm Control >

Stopped-down metering is necessary whenever you insert accessories, such as Extension Tubes M, between the camera and the FD lens for close-up photography.

1 ) Insert the slot of the accessory manual diaphragm adapter (optionally available) over the tip of the automatic aperture lever at the rear of the lens.

2) Push the lever counterclockwise and lower
the adapter into the groove.

3) Mount the lens as it is onto the accessory.


Do not mount the lens with the manual diaphragm I adapter directly onto the camera or the Auto Bellows I etc.



< Film Plane Indicator >
This mark, engraved on the top of the camera body, indicates the exact position of the film plane. It is useful for measuring the exact shooting distane from film to subject in close-up photography. Distane on the lens' distance scale are calibrated from this mark.



Bulb (Long Exposure)
 


It is posible to make an exposure longer than 30secs when doing such types of photography as astro or night photography. 1) While pressing the shooting mode selector, turn the electronic input dial until "buLb" appear on the display panel.
2) Manually set an aperture.
3) The shuttle will remain open as long as you press the shuttle button.


The Canon T90 is desingned so that bulb exposure requires relatively little power, thus saving energy.



When using an FD lens, be sure to remove the aperture ring of the lens from the "A" mark.



30 seconds

-Bulb operation time is display on the display panel by a series of 3 bars and the numbers 1-30. Each bar mark(-) indicates 30 seconds. Exposure time up to 120 seconds is posible( 3 bars plus 30)
-It is possible to control the exposure time within a range of 23hours 59 minutes 59 seconds by using the command Back 90 (optionally avaiable)
-Use of a tripod and cable release is recommended when making long exposures.

Two views of the SPC that handle the TTL flash at the mirror box.

-
Tom Scott -

40 seconds

120 seconds

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Credit: Mr. Richard Yeow, General Manager -Optical Division of Canon Marketing, Tony Kano, former regional head of Canon in Asean Region, for granting special permission to reproduce this manual into HTML format in his site as a form of obligation to all the T90 users worldwide. Pawel Nabe for his image on the Data Memory Back. EEwyn Foo, my nephew, who has spent quite a number of nights converting the original manual in HTML format. Maintenance Team: Kaipin, Terry Carraway & Dr Strangelove; Tom Scott, for his images of the SPD cell, Chris Tutti for his initial effort to scan and prepared the T90 manual in PDF format. My staffs Miss Wati and Mirza for helping the basic setup work. * Canon, T90, FD Lenses, Canon Marketing are registered trade names or trademarks of Canon Inc. Japan.

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