Olympus-OM
[Top] [All Lists]

Re: [OM] John Lind is back - was OM TTL flash behaviour

Subject: Re: [OM] John Lind is back - was OM TTL flash behaviour
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Thu, 19 May 2011 16:13:24 -0400
Welcome back to the keeper of old Sunpak TTL flash info.  :-)

Dr. Flash


On 5/19/2011 3:45 PM, John Lind wrote:
> Thanks - may remain mostly in background and fairly quiet - but always 
> lurking!
>
> Sent from my iPhone
>
> On May 19, 2011, at 2:03 PM, "Piers Hemy"<piers@xxxxxxxx>  wrote:
>
>> Subject says it all - an old stager is still around, albeit quiet for so
>> long.
>>
>> Good to see you again, John.
>>
>> Piers
>>
>> -----Original Message-----
>> From: John Lind [mailto:j-a-lind@xxxxxxxxxxx]
>> Sent: 19 May 2011 18:41
>> To: Olympus Camera Discussion
>> Subject: Re: [OM] OM TTL flash behaviour
>>
>> The amount of light admitted to the film plane in TTL is ambient @ selected
>> f-stop&  1/60th plus the necessary duration of flash to satisfy the TTL
>> metering.
>>
>> There are some occasions for desiring to increase ambient by using 1/30th
>> (versus opening aperture by a stop) and you cannot do this in TTL, only in
>> "Auto" or "Manual" modes. TTL always sets shutter speed to 1/60th *if* it
>> needs to fire the flash to get enough light. If ambient is sufficient TTL
>> will use shutter speed 1/60 or faster based on selected aperture; flash can
>> be forced by stopping down if possible, the increased DoF is acceptable, and
>> flash is desired. I've done the latter to force fill by stopping down just
>> barely enough to activate the flash.
>>
>> -- John
>>
>> Sent from my iPhone
>>
>> On May 19, 2011, at 10:42 AM, "Walters, Martin"
>> <Martin.Walters@xxxxxxxxxxxxxxxxx>  wrote:
>>
>>> In spite of the eloquence and expertise of Dr Flash and others on the
>>> list, flash remains something of a "black art" for me. As I rarely use
>>> flash, my usual approach is to simply put my non-Oly dedicated flash
>>> on TTL and fire away.  For info, the flash is a Braun 340 SCA (full
>>> TTL with the correct adapter shoe), in auto it has two selectable F
>>> stops (F4, F8), a swivel/bounce head with zoom (28-50-100). The filter
>>> set includes a diffuser (coverage for 21mm), ND4, and coloured filters.
>>>
>>> So, I'm taking a flash 101 course, which looks to cover pretty much
>>> all the topics.  I'm in an interesting position as the only film
>>> shooter in the group (we're 8-10). Some of the CanNikon gang appear to
>>> have serious gear, and some of those camera/flash combinations are
>>> probably more intelligent than I am.
>>>
>>> After a couple of courses it's obvious that I'll have some challenges
>>> and some of the concepts will be theoretical rather than practical
>>> (e.g,, flash compensation, though the instructor lent me an EOS to
>>> work with; varying sync speed). My dedicated flash has some
>>> significant limitations, especially no or only very basic power
>>> control (filters on the flash). That being said, the instructor was
>>> quite intrigued that I had full TTL capability both on and off camera.
>>>
>>> One of the things we've looked at is compensation (both exposure and
>>> flash). So, this weekend I'm planning to spend some time test shooting
>>> to see what happens with various setups under TTL. In the meantime,
>>> I'd be grateful for some info on how exposure compensation on an OM2N
>>> affects TTL flash. I assume that it will affect both metering and
>>> flash, which is controlled by the meter (I believe modern N*kon
>>> bodies, for example, treat the two independently). Is this correct?
>>> However, that brings up another question: if exposure compensation is
>>> active, how does the OM actually compensate, when it automatically
>>> fires as 1/60 with a dedicated flash?
>>>
>>> As a third question, AG and Dr Flash have talked about underexposing
>>> the background by 1 or 2 stops. One method mentioned was to set the
>>> aperture for 1/30 exposure, and letting the OM fire at 1/60.  I
>>> understand the concept - and here my ignorance is showing - but does
>>> this work in straight auto or in TTL as well?
>>>
>>> In anticipation of suggestions to get a different flash....  Yes, I've
>>> thought about a T32, though it appears only slightly more flexible
>>> than the Braun, and a Vivitar 285, which doesn't do TTL but allows
>>> control of flash intensity. However, the lazy side of me doesn't want
>>> to throw away TTL.
>>>
>>> As far as sync speed is concerned, I could always get out my Pen F,
>>> which syncs at all speeds. Of course, no TTL, and life is probably too
>>> short to deal with other challenges!
>>>
>>> Martin
>>>
>>>
>>> --
>>> _________________________________________________________________
>>> Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
>>> Archives: http://lists.thomasclausen.net/mailman/private/olympus/
>>> Themed Olympus Photo Exhibition: http://www.tope.nl/
>>>
>>
>> --
>> _________________________________________________________________
>> Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
>> Archives: http://lists.thomasclausen.net/mailman/private/olympus/
>> Themed Olympus Photo Exhibition: http://www.tope.nl/
>>
>> --
>> _________________________________________________________________
>> Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
>> Archives: http://lists.thomasclausen.net/mailman/private/olympus/
>> Themed Olympus Photo Exhibition: http://www.tope.nl/
>>
-- 
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/

<Prev in Thread] Current Thread [Next in Thread>
Sponsored by Tako
Impressum | Datenschutz