T90 bulb battery drainage

[dpowis]

Hi all,

 

I've heard that the EOS 600 series has the same shutter as the T90,

and that the EOS 600 can do a bulb exposure for unlimited time.

Could anyone confirm, as I am thinking of getting a RS60T3 (or

whatever it's actually called) remote control to do night shots with

my T90.

Thanks.

[awahlster]

It is my understanding the (T90 uses power to open and close the shutter but not to hold it open. Like the A series Canons do. The remote switch works quite well it has a nice locking button.

[jeffrey_winn]

I have a T-70 and can you also do an unlimited exposure with the T-70, as it uses the same remote switch?

 

Thanks,

 

Jeff

[alan_swartz]

The T90 uses a quick pulse of power to open the shutter, then another one to close it. It should be capable of very long bulb exposures with no unreasonable draw. I once measured its consumption during a bulb exposure, and though I don't remember the reading, it was quite low, on the order of 1-2 milliamperes. The batteries ought to last for days at that rate.

 

The A-series cameras use power to energize an electromagnet that HOLDS the shutter open. They can exhaust a battery quickly.

 

I don't know about the T70. The T50 shutter design is different than the T90, and I'd bet that the T70 is more closely related to it. Insufficient data on my part!

[nick_evans1]

I have used a RS60T3 to hold the shutter open on my/girl friends T90 for quite a a while with out any problem. Longest I have done is about 10-15 mins.

 

HTH

 

Nick

[chris_ross2]

I used one for astrophotos, a series of hour long plus exposures all night, 2 night every month plus normal daytime use and the batteries would last a year or more. No problems at all,just needed to keep the dew off the camera.