Additional information on Canon T70 Camera, 1984
Part IV - Flash Photography and Command Back 70

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277T flash Front.jpg
Programmed Flash Flash photography is another area where it makes the T70 shines. Contact are provided for conventional electronic flash units + special contacts for dedicated Speedlites. A new programmed Speedlite gives stunning results under all conditions.

277T SideView.jpg

Attach the Speedlite 277T to the camera and you have a combination in simplicity and versatility. Indoors or syncro-lightlight photography the combination of T70 and 277T works very well. (Fully automatic flash if couples with dedicated Canon Speedlites). The automation measures the subject's own reflectivity and the ambient lighting. And while other flash units offer three or perhaps four automatic apertures, the 277T has an incredible
8 automatic apertures.

speedlite300TL8mdm.jpg Speedlite277T1mdm.jpg 199Aflashbmdm.jpg

Various Canon
Speeedlite models.

With Instruction Manuals Links

Somehow, it works like the current AF flash (It looks great too). In the Program AE mode, the aperture is set automatically. Press the shutter button gently and the unit fires a low-intensity infrared preflash to measure the distance. The aperture chosen by the flash is indicated in the finder and on the 277T's back panel. If the viewfinder LED flasites a warning, move closer to the subject. Now focus and shoot. The shutter is automatically released at the 1/90 sec sync speed. Electronic Flash AE is equally easy. Just key in the desired aperture and leave the rest to the 277T. (Manual selection is also possible if automatic flash is not desirable, which it works from f/2 to f/22 in 8 steps) LCD 90sec.gif

277T flash Backview.jpg

Auto Shooting ranges with FD 50 mm f1.4

Flash range chart.jpg (12k)

: The 277T features 8 automatic apertures (f/2 to f/22) for greater coverage and maximum control of depth of field.


Guide numher: 25 (ISO 100/21°, ASA 100 m) or 82 (ISO 100/21°, ASA 100-ft) Flash coverage angle: Coversthe field of view of 35 mm lens in the 35 mm format.
Recycling time: 0.5 sec to 8 sec (full flash -when using alkaline batteries, 0.5 sec to 6 sec (full flash) when usmg Ni-Cd batteries.
Number of flashes: 200 (full flash) when using alkaline batteries, 65 (full flash) when using Ni-Cd batteries.
Flash aperture: Automatically set: f/2, 2.8, 4, 5.6, 8, 11, 16, 22. (Manual selection is also possible from f/2 to f/22 in 8 steps)
Auto shooting distance range: (ISO 100/21°, ASA 100): 0.5 m to 12.5 m (1.6 ft to 41 ft) (varies according to the aperture and fllm speed.)
Out of auto shooting distance range: With Program flash AE if the subject is too far away, the aperture value flashes in the viewfinder when the shutter button is pressed halfway.
Film speed scale: ISO 25/15° to ISO 400/27° (ASA 25 to ASA 400)
Power source: Four AA size alkaline batteries (6v) or Ni-Cd batteries (4.8v) Dimensions: 66 (w) x 97 (H) x 64.5 (D)mm (2-5/8" x 3-13/16" x 2-9/16") Weight: 280 g (9-7/8 oz) with batteries

COMMAND BACK 70 Module for remote photography and data recording

Another interesting and innovative effort by Canon designed for the T70 was a new, awesome trend-setting system film back in the Command Back 70. More than just another data back. It also functions as a control center to take time exposures or regular shots up to 24 hours in advance. Interval shooting, until film end or for a pre-determined number of frames, is also possible. It is a combination of regular databack, intervalometer and remote back. It can be quickly and easily interchanges with the standard back to become the
nerve center for a host of quartz-controlled data imprinting and timer functions. An LCD readout and push buttons on the slim unit let you input instructions for self-timed shutter release between 1 second and 23 hours, 59 mins, 59 secs. Interval shooting over the same time frame is also possible and an invaluable asset in such fields as close-upphotography or scientific research applications. The camera can be set to take pictures at fixed intervals until the film runs out or for a predetermined number of frames. Time exposure control, in combination with other command functions if required, allows long exposures of up to several hours duration.

RemoteLCD Illus.gif

1) Mode selector
2) Position selector
3) Number set button
4) Film speed selector
5) Data/timer selector
6) Start/stop/clear button
7) LCD display panel

Command Back 70.jpg
Highly Recommended External Link: Instruction Manual for Canon T-70, T80 and even T-90 Command Back. An excellent Canon FD resource page brought to you by Christian Rollinger from Luxembourg.

Data recording is a convenient feature for professional and amateur alike where it needs to have that equiped. A built-in calendar in the Command Back 70 keeps track of leap years and different month lengths up to the year 2029. Perhaps Canon has learnt the lesson on the Databack MA designed for the A Series models which its input dial for Years expired in 1987. The day/month/year can be recorded on the film in three different orders to document important events.

For an up-to-the-minute record, the day, hour and minute can be imprinted. An alphanumeric coding mode lets you assign any 6 digit code including the letters A through F. The frame counter is also recordable. All data imprinting functions can be used in conjunction with the command modes.

Credit: Images courtesy of Mr. Claudio®. who is a collector for Canon photo gear, he also has an Ebay Section as well as maintaining a website on his own where occasionally trading some photo equipment. Image(s) copyright © 2003. All rights reserved.

Data recording
LCD date.gif
Auto-date automatically records the date up to the year 2029 in year/month/day, day/month/ year or month/day/year order.
LCD date.gif
Record the time, to the exact minute, when you took the picture. The digital clock also gives the day.
LCD date.gif
Encode important pictures for efficient filing and retrieval. The letters A through F can be included in the 6-digit code.
LCD date.gif
Sequential numbering of the ffames up to 9999 is possible in the frame counter mode.
LCD off.gif
Data imprinting function off.

Command Modes
LCD time.gif
Delayed shutter release of any set time from I sec to 23 furs, 59 mins, 59 sees is possible in self-timer mode.
LCD time2.gif
Program the Command Back 70 to take repeat shots at fixed intervals.
LCD time3.gif
Long exposures can be made unattended and with extreme accuracy.
LCD 36.gif
The number of pictures to be taken is programmable with the frame counter mode.

Specifications for Command Back 70

Type: Fully automatic data back wits LCD display, quartz digital auto calendar, and camera control function usable with T70.
Data Recording functions: Four modes plus non-recording (OFF).
Year/month/day (switchable to day/montb/year or month/day/year) Day/hour/minute
Record number (up to six digits, or the letters A through F, or a space)
Frame counter: Max. 4 digits (additive)
Command function: Three timer modes and a frame counter mode. Seff-timer
Interval timer
Long release timer: These three can be set in 1-second units from 1 sec to 23 hours, 59 minutes, 59 sees.
Frame counter setting: (the number of exposures can be set from 1 to 99.) Any combination of these command modes is possible, however, the long release mode and the frame counter mode cannot be used Without the interval mode. Data recording and command functions can be used in combination.
Power source: 3V provided by one coin-type lithium battery. (CR2025). Battery Life: About 4 years.
Dimensions: The Command Back 70 increases the overall depth of the camera by 3.4 mm.
: 65 g (2-5/16 oz) (compared to 50g (1-3/4 oz) for the ordinary camera back.)

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Shared Resources (some links are from Christain Rollinger site): Canon Command Back for T-series Models Instruction Manual; Canon Remote Switch 60 Manual Speedlites (Canon Flash models:- Canon 300TL flash(1.5MB); Macrolite ML-1(HTML); Macrolite ML-2; Macrolite ML-3; Speedlite 133a; Speedlite 155a(HTML); Speedlite 177a; Speedlite 188a(HTML); Speedlite 199a; Speedlite 244t; Speedlite 277t (HTML); Speedlite 533; Speedlite 577) & Macro photography.Others:- Canon Auto Bellow Unit Manual; Canon Macro Photography Guide, Canon Slide Duplicator Manual, Canon Angle Finder User's Manual Canon Macro Photography Guide

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