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[4] Manual Mode
In the manual modes, the aperture must be calculated from the guide number. The
aperture is then set using the electronic input dial of the T90. The shutter speed
is automatically set to 1/250 sec.
Aperture = Guide Number/Shooting Distance
Note: To find the correct aperture, the same
unit must be used for the guide number and the subject distance. For example, meters
and meters or feet and feet. Since the guide number changes depending on film speed
and the position of the flash head, the 300TL has two stickers giving the guide numbers
in both feet and meters for various film speeds and flash head positions. The sticker
should be attached to a convenient place on the flash unit.
Guide Number Table (m)
G.No. (Manual Hi)
|
f/ISO |
25 |
50 |
64 |
100 |
200 |
400 |
800 |
1000 |
1600 |
|
24mm |
12.5 |
17.5 |
20 |
25 |
35 |
50 |
70 |
79 |
100 |
|
35mm |
15 |
21 |
24 |
30 |
42 |
60 |
84 |
94 |
120 |
|
50mm |
17.5 |
24 |
28 |
35 |
49 |
70 |
99 |
110 |
140 |
|
85mm |
20 |
28 |
32 |
40 |
56 |
80 |
113 |
126 |
160 |
Note: G.No. (Manual Lo) = G.No. (Manual Hi) divided by 4
Guide Number Table (ft)
G.No. (Manual Hi)
|
f/ISO |
25 |
50 |
64 |
100 |
200 |
400 |
800 |
1000 |
1600 |
|
24mm |
41 |
58 |
65 |
82 |
116 |
164 |
232 |
259 |
328 |
|
35mm |
49 |
69 |
78 |
98 |
138 |
196 |
277 |
310 |
392 |
|
50mm |
57 |
80 |
91 |
114 |
161 |
228 |
322 |
360 |
456 |
|
85mm |
65 |
92 |
104 |
131 |
185 |
262 |
370 |
414 |
524 |
Note: G.No.
(Manual Lo) = G.No. (Manual Hi) divided by 4
Operations in Manual Mode
1) Make sure the aperture ring of the lens is set to the "A" mark.
2) Set the T90 to the aperture-priority AE mode.
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|
3) Turn the main switch ON. (" |" mark)
4) Set the mode selector to Mode Set position, and set the sync position selector switch to first curtain sync.
5) Set the control mode set button to either Manual Hi or Manual Lo and make sure the control mode confirmation lamp lights up.
6) Focus the subject and read the shooting distance from the lens' distance scale.
7) Use the guide number formula to determine the aperture value and set the aperture on the T90 by turning its electronic input dial.
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|
Notes:
* Immediately after the pilot
lamp lights, the flash is not yet fully charged. If you want to take a picture at
that time, open the aperture by a half or a whole f/stop to make up for the weakened
flash power.
** If the calculated aperture value is in between
two values on the aperture ring, set the larger aperture of the two.
Intermediate Operation
FEL mode + H/S Control
Just as exposure compensation is necessary under certain conditions during normal
photography, exposure compensation is also sometimes necessary during flash photography.
With the Canon Speedlite 300TL, exposure can be effectively controlled by using the
FEL Mode with the H/S control.
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Operation |
3) Center the main subject in the spot metering mark, press the spot metering button and activate the FE lock.
4) Check the viewfinder information.
a. The fixed dot (
) displayed at the triangle index
in the viewfinder indicates the exposure level for the main subject.b. The free dot (
) displayed next to the fixed dot indicates
the exposure level for the background relative to the exposure level for the main
subject.
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 |
5) If both the fixed dot ( ) and the free
dot () are
aligned with the triangle index, both the main subject and the background will be
correctly exposed.
6) If the fixed and free dots are not aligned with the triangle index, they can be
moved as follows to balance the exposure:
 |
a. Pressing the H/S control button moves the free dot up and down for the background exposure. |
 |
b. Operating the electronic input dial moves the fixed dot up and down to control the exposure for the main subject. |
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Slow Sync
Flash Photography
If a photograph is taken of a subject in front of a dark background, the background
will normally appear black. In such cases, the background exposure can be easily
adjusted using the following procedure:
When the T90 is in the shutter-priority AE mode, the shutter speed can be set to
as long as 30 seconds. In the aperture-priority AE mode, the aperture is set automatically
between 1/250 and 30 seconds. The 300TL can be set to either A-TTL or FEL mode.
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Note: If
the shutter is set to a speed faster than 1/250 sec., the setting will be changed
to 1/250 sec. automatically. Slow-sync flash cannot be used with the pro-
gram AE modes of the T90.
Second Curtain Sync Flash Photography
With focal plane shutters, flash synchronization is made when the first curtain is
fully open. With the combination of the T90 and the 300TL, however, it is also possible
to make the flash synchronization immediately before the second curtain starts running.
This is called second curtain flash sync and is effective when a slow shutter speed
is used. To use this function, set the sync position selector to the right side,
as shown in the photo.
When second curtain flash sync is used with a moving subject and a slow shutter speed,
the light from the flash clearly illuminated the subject for a sharp image but there
is also a trailing image created by the exposure from ambient light for a flowing
effect.
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Note: The
second curtain sync flash photography is NOT
possible in the Full
Auto mode.
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Canon TTL Flash Models:-
300EZ | 300TL | 420EZ | 430 EZ | 480EG | 540EZ | other non-TTL Canon flash models
|
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Credit: 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.
Mr. Richard Yeow, General Manager
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to all the T90 users worldwide. Maintenance
Team: Kaipin, Terry Carraway & Dr Strangelove; Tom Scott, for his images
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to scan and prepared the T90 manual in PDF format. My staffs Miss Wati and Mirza for helping the basic setup
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