But wouldn't electronic switch chatter be faster than what the motor
drive and camera could respond to? I have little experience with
debouncing switches in software but my recollection is that we're
talking times of a few milliseconds at most. Since the motor drive can
only run about 5 frames/sec it can't respond to events of less than
200ms duration without having some form of memory to capture the switch
bounce. What's the flaw in my logic? Is it the user's thumb that's
doing the chattering at a much slower rate than switch contact bounce?
Chuck Norcutt
John Hermanson wrote:
> Maybe, possibly could be a dirty (chattering) switch in the T-45. It's
> making partial contact so the motor thinks the button was pushed two or
> more times when it is only being held down.
>
> ___________________________________
> John Hermanson
> Camtech Photo Services, Inc.
> 21 South Lane, Huntington NY 11743
> 631-424-2121 | Olympus OM Service since 1977
> http://www.zuiko.com | omtech1 AT verizon.net
>
>
> John Morton wrote:
>> Ah - okay; no, I haven't had any problems with the motor drive when
>> using it on the camera alone. Also, I haven't had any problems with
>> the flash used on the camera alone. Just with the flash and motor
>> drive together.
>>
>> I first noticed something amiss when shooting some film of a band in
>> a club: set to single frame, the motor drive was taking two exposures
>> every time I took a shot with the T-45 flash.
>>
>> A month or two later, I tried to take a few frames of a Monarch
>> butterfly on some Echinacia I have growing in my backyard. "A couple
>> of shots" instead turned into a whole roll; and not long afterward,
>> while visiting my daughter in British Columbia (end of August), the
>> same thing happened again when taking some photos of her playing
>> ping-pong: 'a shot or two' became the whole roll.
>>
>> It is a used flash (KEH) and I've had it for less than a year, so I
>> don't really know what to expect from it. I certainly didn't expect
>> that; but it is a really nice flash (well, as a concept) and I would
>> like to be able to use it with the motor drive.
>>
>> John M.
>>
>>>>>> <<<<
>> Date: Tue, 02 Oct 2007 09:04:19 -0400 From: John Hermanson
>> <omtech1@xxxxxxxxxxx> Subject: [OM] Re: Is Dr. Flash in jeopardy?
>>
>>
>> I mean, when you use the body and motor drive by itself, does the
>> camera shoot more than one frame when set to single mode? Does the
>> multiple firing with the T-45 and motor drive happen on more than one
>> body? As Chuck said, the button on the T-45 is just a switch. If the
>> motor is set to single, and it fires more than one frame, it usually
>> indicates a defect in nicad pack or md switch in the camera body.
>>
>> ___________________________________ John Hermanson Camtech Photo
>> Services, Inc. 21 South Lane, Huntington NY 11743 631-424-2121 |
>> Olympus OM Service since 1977 http://www.zuiko.com | omtech1 AT
>> verizon.net
>>
>>
>>
>>
>> John Morton http://OriginOfWriting.com
>>
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