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Surprising data on power consumption of EOS bodies in Bulb mode 


Date sent:        16 Oct 96 14:22:17 EDT
From:             "Chuck Westfall (Canon)" <71170.1056@CompuServe.COM>
To:               Willem-Jan Markerink 
Subject:          Re: (Fwd) Re: ?: Battery lifetime at longtime expos
Willem-Jan,

The maximum time-exposure length varies according to camera, temperature conditions and power supply. We have only partial data on hand: 


                   Power        Maximum Operating Time
Camera             Supply       During Bulb Exposure 
------------------------------------------------------
EOS 600 series     2CR5         Unlimited*
EOS 700/750/850    2CR5         16 hours
EOS 1              2CR5         60 hours (50 hours with PDB E1/alkaline) 
EOS-1N/RS          2CR5         60 hours (50 hours with PDB E1/alkaline)
EOS 5/A2/A2E       2CR5         6 hours                
EOS 10/10s         2CR5         Unlimited*
EOS 50/Elan II     2CR5         15 Hours 
EOS 100/Elan       2CR5         6 Hours
EOS 500N/500       CR123A x 2   6 Hours
EOS Rebel G/XS     CR123A x 2   6 Hours
EOS 1000/1000F     2CR5         6 Hours
EOS Rebel/Rebel S  2CR5         6 Hours
EOS 1000N/1000FN   2CR5         6 Hours
EOS Rebel II/S II  2CR5         6 Hours
EF-M               2CR5         6 Hours
EOS 5000/888       CR123A x 2   6 Hours

[addition WJ]
EOS 3		   2CR5		1000 hours [see below]
EOS 300
EOS 1v		   2CR5		1000 Hours
EOS 30/33/7E/7
*The EOS 600 series and EOS 10/10s use a shutter release mechanism that only draws power to open or close the shutter curtains. No power is consumed when the shutter is at rest, whether it is open or closed. (This can be proved by disconnecting the battery during a long exposure.) Consequently, these models are better suited than other EOS cameras for extended time exposures such as those required for astrophotography.

It should be noted that the figures quoted are presumably accurate for operation at room temperature only. I would expect poorer performance in cold temperatures. Also, there is very little data available for performance with alternate power supplies. For example, we have no idea how the performance of the EOS-1/1N/RS series would be affected by the use of Ni-Cd Pack E1 or AA-size lithium cells in Power Drive Booster E1, or with BP-E1. Presumably, Ni-Cd would perform worse than alkaline at room tmeperature, but better in cold conditions. Similarly, there's no information available on bulb exposure performance for the EOS 5/A2/A2E or EOS 50/Elan II series with their respective D-cell power packs, though these accessories increase shooting capacity for regular photography up to 700% compared to the 2CR5.

Regards--Chuck 







Date sent:        Sat, 31 Jul 1999 22:16:54 +0800
From:             Dinesh 
To:               EOS List 
Subject:          EOS: Eos 3's shutter is best!
Send reply to:    eos@avocado.pc.Helsinki.FI
The following is a quote from the British magazine 'Amatuer Photographer' dated 26th June 1999.

Start quote:-

"Tests conducted by French photographic monthly Chasseur D' Images prove that Canon's EOS 3 has a more durable shutter than it's main rival SLRs.

The magazine tested the EOS3's shutter - and those of the Minolta Dynax 9 and Nikon F100 - after Canon claimed it would operate for over 100,000 exposures.

A shutter testing machine was hooked up to a computer to count the number of shutter fires that each camera was capable of.

The Minolta's shutter failure was recorded at 82,586 firings, equivalent to taking 900 pictures a year over 90 years. This is pretty good but a pro shooting ten 36-exposure rolls per week would finish off the Dynax's shutter in four and a half years.

The Nikon F100's shutter failed after 130,847 exposures which works out at around 145 years with 900 exposures per annum. The ten-roll-a-week pro would have to replace its shutter after around seven years.

The shutter mechanism on the EOS 3, however, was shown to be able to last for 424,477 exposures. This equates to 471 years of shooting at 900 exposures per year and a professional lifetime of around 22 years.

The secret of the EOS 3's durability lies in a re-design of the mechanism. What Canon calls a 'rotary magnet shutter' deploys an electronically controlled, non-contacting rotary magnet to activate the first and second curtain movements. The design is claimed to be free of sticking problems caused by dust and grit - which helps to make it more reliable.

The set-up also needs no power to hold up the second shutter curtain open during a bulb exposure and this helps to increase the life of batteries. Canon claims that an exposure of up to 1000 hours (more than 41 days) is possible from a single battery. However, that claim has yet to be tested by any magazine."

End quote. 


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