-----Ursprungligt meddelande-----
Från: Frank van Lindert <lindertv@xxxxxxx>
Till: olympus@xxxxxxxxxxxxxxx <olympus@xxxxxxxxxxxxxxx>
Datum: den 4 november 1998 22:20
Ämne: Re: [OM] IS-3 and IS-3000 not identical cameras?
>On Wed, 04 Nov 1998 13:37:53 -0500, John Hermanson <omtech@xxxxxxxxx>
>wrote:
>
>>I will be testing the next IS-3000 that comes in for service (whenever that
>>might be.)
>>
>>John
>>
>I found the relevant page in the English edition of the Magic Lantern
>Guide called Olympus IS2 & 3 (by Richard Huenecke and Bob Shell)
>
>On p. 118 it says:
>
>FAST FLASH SYNC
>(IS-3000 only, not on IS-3)
>
>This feature allows you to use flash or fill flash at any shutter time
>up to 1/2000 second. Unfortunately, due to patent licensing
>difficulties, this feature is not found on North American IS cameras.
>In operation, this system works by pulsing the flash rapidly at
>shutter speeds faster than 1/100 of a second producing the appearance
>of flash synchronization at speeds faster than the true maximum sync
>speed.
>This system allows some types of photography which would be impossible
>otherwise, but with very limited flash power in this mode. Even with
>ISO 400 film your maximum shooting distance is only around ten feet.
>
>end quote
>
>In the German edition of this book by R.Huenecke (alone this time),
>devoted only to the IS-3000 and with about double information content,
>the super FP flash as it is properly called there described in more
>detail.
>
>BTW, it only applies to the built-in double flash - not the G-40.
>
>Frank van Lindert
>Utrecht NL.
Thanks Frank for solving this query. It wasn´t the first time you´ve solved a
mystery for us here on the list, and I gather it won´t be the last either. So
it was the super FP capability that was the difference. Amazing. I´ve always
thought the IS-3 had this too. I must admit I havent tried it out yet, but in
light of this I certainly will as soon as I can. Here´s what my IS-3000 manual
has to say about it:
-quote-
"Super FP Emission
The emission time of a conventional flash is very short. So an SLR´s focal
plane shutter can only synchronize with the flash at a slower shutter speed
which allows the shutter curtains to be fully open. The IS-3000 has a new
emission system called the super FP which makes the duration of emission
longer, achieving full synchronization even at shutter speeds so fast that the
shutter curtains are not allowed to fully open. The Super FP Emission is
especially ideal for daylight synchro such as when the subject is backlit. This
function lets you easily take natural looking daylight synchro pictures that
benefit from an illumination effect similar to that of professionally used
silver reflectors. Select a wide aperture to make your subject stand out
against a blurred background."
-end quote-
There is also a chart with combinations of aperture setting and shutter speed
when there is no natural lighting using color negative film. With a shutter
speed of 1/125 you have a working distance from 1m (3.3ft) to 8m (26.2ft)
depending on aperture setting and film speed. With 1/250 from 1m to 5.6m
(18.4ft), with 1/500 from 1m to 4m (13.1ft), with 1/1000 from 1m to 2.8m
(9.2ft) and with 1/2000 from 1m to 2m (6.6ft). When there is natural lighting
the camera-to-subject distance increases beyond the above data. Note that the
Super FP Emission is only available when using manual exposure or portrait
exposure mode.
It is somewhat contradicting however that the Magic Lantern Guide talks about
"this system works by pulsing the flash rapidly at shutter speeds faster than
1/100 of a second producing the appearance of flash synchronization at speeds
faster than the true maximum sync speed", while my manual says "the super FP
makes the duration of emission longer, achieving full synchronization even at
faster shutter speeds". Is it not a true synchronization then, but merely a
flash technic that produces results as if it was true synchronization?
I guess the super FP capability of the built-in G28 flash suffers from weak
output in much the same way as with the F280 flash. I wonder how the above data
compares to the F280 in super FP mode? Wait a minute. They have the same output
GN 28, doesn´t they? Don´t tell me it´s basically the same flash! Do the F280
have dual light emitting tubes as well? Maybe this is the secret connection
between the OM and the IS system. :-)
>Per, your entire OM equipment would certainly have been too much.
>But one IS-3000 (with super FP!) is always welcome...
>
>Frank van Lindert
>Utrecht NL.
Frank, I sincerely hope that you´re not too disappointed now for having bought
the IS-3 instead of the IS-3000 ;-)
I presume you were not aware of this difference then?
Per Nordenberg
Kolmården, Sweden
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