[rollei_list] Re: Flashbulbs
- From: Allen Zak <azak@xxxxxxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Tue, 31 May 2005 21:02:12 -0400
On May 31, 2005, at 6:20 PM, Don Williams wrote:
> At 03:08 PM 5/31/2005, John Jensen you wrote:
>> My vague recollection is that M is 15-20 milliseconds
>> delay, F about 5 milliseconds, and X zero
>> milliseconds.
>>
>> The purpose of the F bulbs was for a short lighting
>> time for action shots (not as quick as an electronic
>> flash, however).
>>
>> John
> Yup, those numbers do sound right when I think back. Now about
> everything
> but the M2 bulbs I use underwater is set for X.
>
> My recollection is that what you refer to as "delay" was the delay
> allowed
> for the bulbs, and would actually be an advance contact trigger time
> before
> full shutter opening.
>
> What I don't recall is what designation was used for bulbs used for
> focal-plane shutters. Of course now most focal plane shutters can use
> just
> about any bulb at 1/30 or 1/60 sec, some even shorter exposures.
>
> DAW
>
> (I'm supposed to be working today but decided to sort of unwind from
> the
> past few days- I work at home anyhow)
At 1/25 sec., a leaf shutter could open up to all the light from a
flashbulb and required no delay. The "M" setting was for flashbulbs at
shutter speeds higher than 1/25th sec. It started the filament burning
a few milliseconds before the shutter opened so the flash could be
caught at its peak. "F" was for gas filled bulbs that burned a lot
faster, about 1/200 ms., requiring less shutter delay.
Allen Zak
---
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