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Etienne Namur
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, November 16, 2005 - 11:54 am: | 
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Hello,
I' want to use a speedlite 199A flash with a Canon FTb QL . Some peoples said me it could be dangerous to use Ni-Mh battery in this flash , it could burn ......
What do you think of this ? |
Glenn Middleton
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, November 16, 2005 - 02:24 pm: |
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I have used NiMh batteries in both A and T series Canon Speedlites with no problems.The only battery sensitive Canon kit I have experience of is the MA Drive unit, when fitted with the AA battery pack.The use of NiMh batteries in this pack can lead to the motor burning out - but this is a function of how the drive operates when the roll is fully exposed.The motor is held in a powered up, stalled condition until the rewind is operated.Thus with high capacity cells everything can get hot. - not really a battery problem.
As long as the voltage is correct and I do not think you will have any problems with AA NiMh batteries, because the voltage is the same.This is not true of the CR-V3 NiMh batteries which can have a voltage of 3.7 volts instead of the normal 3 volts, but these are from the 'Digital' age and not of concern here. |
Etienne Namur
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, November 16, 2005 - 09:17 pm: |
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Thank for your fast response :-)
A friend has burned two flashs from A séries and each time he used Ni-Mh batterys , it's why i was a little bit affraid .
But I think it was because this flash have not been used during many years they become fragiles . |
Glenn Middleton
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, November 17, 2005 - 05:29 am: |
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Do not use the 2000/2300 range on old flash units.If the electronics are a bit iffy; Instead of the batteries heating up and loosing power, the higher output ones cook the circuit before failing - if you see what I mean.
Well this is what I have found on units that people have asked me to look at. No doubt somebody will have all the scientific facts. |
Stuart Willis
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, November 18, 2005 - 01:23 am: |
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There is seldom any problem with using low reistance cells with flashguns (ie: NiCads, NiMh and similar).
The reason why many flashgun manufacturers caution against the use of such is nothing to do with voltage or physical compatibiity. The danger is the possibility of incorrect insertion as with the contingent risk of short-circuiting. In this case an enormous instant current flows. Enough indeed to burn a hole through your hand - let alone destroy the flashgun.
Hope this post saves someone from disaster !
Stuart Willis |
