rayq
Active member
When setting high speed sync on the 420EX, how high can the shutter speed can be set to in XT? Thanks.
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How High the Speed Can Be Set Using 420EX High-Speed Sync?
- Thread starter rayq
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Lemming51
Forum Pro
FP high speed sync works at all shutter speeds, through the XT's fastest 1/4000.
iliask
Senior Member
1/200th sec.
Custom function 3 allows you to set the speed to Auto or 1/200th fixed for Av. In manual mode you can set shutter speed anywhere up to 1/200th.
Ilias
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http://i20.photobucket.com/albums/b207/iliask
Custom function 3 allows you to set the speed to Auto or 1/200th fixed for Av. In manual mode you can set shutter speed anywhere up to 1/200th.
Ilias
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http://i20.photobucket.com/albums/b207/iliask
David Whittaker
Forum Enthusiast
I have the 430EX which I believe operates the same as the 420but with higher power.
In manual and tv mode wityh high speed sync you can go up to the highest shutter speed of 4000. In av you appear limited to 200 by using the custom function.
Regards,
David
In manual and tv mode wityh high speed sync you can go up to the highest shutter speed of 4000. In av you appear limited to 200 by using the custom function.
Regards,
David
iliask
Senior Member
A shutter speed of over 1/200th will not make any difference, i.e. you will not be able to freeze motion more than you would at the camera's max x-sync speed.
Ilias
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http://i20.photobucket.com/albums/b207/iliask
You are only limited to 1/200 when NOT using high speed sync.
With High speed sync, you should be able to take it up to the max shutter speed of the camera, 1/4000.
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-Larry
http://www.pbase.com/lardog
With High speed sync, you should be able to take it up to the max shutter speed of the camera, 1/4000.
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-Larry
http://www.pbase.com/lardog
Rowbear
Senior Member
Lemming51
Forum Pro
Not true. 1/4000 with FP high speed sync will freeze motion in the same way 1/4000 will in ambient light.
iliask
Senior Member
With E-TTL and a compatible body (like the XT) you can exceed the max x-sync at the cost of lower flash output. But it's the flash burst that freezes action, not the shutter speed.
You may want to take a look at this article:
http://photonotes.org/articles/eos-flash/index2.html#xsync
Ilias
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http://i20.photobucket.com/albums/b207/iliask
You may want to take a look at this article:
http://photonotes.org/articles/eos-flash/index2.html#xsync
Ilias
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http://i20.photobucket.com/albums/b207/iliask
Actually it is the shutter speed that freezes action. At 1/4000 second you are capturing that length of time. A flash is only illumination for your subject that happens to be on during that time. It could actually flash for 1/200th of a second (probably does), but the camera will only record 1/4000th of a second somewhere within the flash's 1/200th.
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- Yobrow
http://www.pbase.com/yobrow
You're right that at max x-sync, the duration of the flash is shorter than 1/4000, and will therefore freeze motion better than using high-speed sync. But that wasn't the question. The question was about the highest shutter speed that can be set using high-speed sync mode.
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Jordan
Lemming51
Forum Pro
Good article, but the statement "flash burst freezes action, not shutter speed" only applies to "slow sync" flash, with shutter speeds equal to the x-sync and slower. For FP high speed sync, it is the fast shutter speed that freezes motion.
RCederholm
Forum Enthusiast
from Spinal Tap (the Movie)....
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