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06/08/2004 04:21:35 AM · #1 |
I'm thinking of buying a flash unit for my Digital Rebel and I have a few questions that hopefully some of you can answer:
1. What's the difference between a dedicated and a non dedicated flash unit?
2. What is a Radio Slave System?
June
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06/08/2004 06:52:45 AM · #2 |
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06/08/2004 07:33:00 AM · #3 |
The following link may be of interest to you:
Canon EOS Beginners FAQ - Part IV - Flash
This may not answer every question, but it is a good start. |
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06/08/2004 07:49:25 AM · #4 |
June...a dedicated flash unit is one that is made to specifically operate with your model camera. The camera's on-board computer and eTTL (electronic through the lens metering system) figure out the correct exposure settings without much, if any, photographer input. It makes life a lot easier for the photographer and also makes these decisions faster than a human does. That's all controlled by the camera's computer. Your camera's manufacturer makes dedicated flashes for it's cameras but there is also third party flash manufacturers that produce dedicated flash units from manufacturers such as Metz and Sunpak.
Non-dedicated model flashes do not use the eTTL metering or camera computer to make these exposure settings. There are two types: manual and automatic. Manual requires the photographer to use a flash meter to make settings and automatic has a sensor on the flash unit that tells it when the subject received enough light and when to shut off the light. You have to set ISO, shutter speed, aperature for correct exposure.
A slave system is one in which a non-connected to the camera flash(s) has either an integral or added sensor that is set off with either light from another flash, or a radio wave.
Originally posted by chiqui74:
I'm thinking of buying a flash unit for my Digital Rebel and I have a few questions that hopefully some of you can answer:
1. What's the difference between a dedicated and a non dedicated flash unit?
2. What is a Radio Slave System?
June |
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06/08/2004 09:05:29 AM · #5 |
Thanks, that was really helpful.
June
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06/12/2004 07:10:09 PM · #6 |
Message edited by author 2004-06-13 11:41:47. |
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