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02/05/2005 03:06:43 PM · #1 |
Hi,
I'm sure my question is simple to answer for a not-newbee but to me it is quite confusing:
When taking a picture using the build-in flashlight (Camera:Canon 300D)in auto-mode i get shutterspeeds from about 1/60.
Now, using the Av-mode with all settings (Aperture, ISO, etc.) exactly the same as the camera uses in auto-mode, i get shutterspeeds of no less then 2,5 seconds. (Needless to say i'm taking pictures of exactly the same subject and lighting conditions)
Is there anyway i can get the same shutterspeed in Av-mode as the camera uses in auto-mode?
And for better understanding: why doesn't my camera use the same shutterspeed when all other settings are the same as in auto-mode?
Mpol. |
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02/05/2005 03:12:07 PM · #2 |
| If it is the same as the 20D there is a setting to tell the camera what to do in Av mode, it can either be set to do a flash fill where it will do a long enough exposure to get the background exposed fully, or you can set it to 1/250 sec. I find that if I want to control the aperture it is best to use full manual mode, the flash will still try and get the exposure right. |
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02/05/2005 03:47:55 PM · #3 |
| Basically what is happening is that when you put in Av mode, the flash will expose the subject and the camera will expose for the background. Thus the darker your background is (without any flash), the longer the exposure time will be. When in auto mode, it assumes that you do not care about exposing the background. If you want to expose only the subject with the flash leaving the background dark while controlling the aperture, your only bet on this camera is to set it in M mode. Anything between 1/60 to 1/200 would suffice. You cannot get lower than 1/200 with the in-built flash I'm afraid (known as X-sync). |
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02/05/2005 03:50:01 PM · #4 |
Scott is right about the 20D but I don't think the 300 has that feature (at least I can't find it). The camera is metering the exposure at the set aperture not counting the flash. the flash should be considered a fill flash with the camera working to properly expose the background.
If you want full control of both the aperture and the speed, use manual. |
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02/05/2005 04:21:35 PM · #5 |
For more information on how the Canon EOS series works with flash, this is a very informative read and will help you choose the best settings for whatever your situation may be... It also explains why you get particular shutter speeds/how the camera decides based on what mode you're in:
//photonotes.org/articles/eos-flash/index.html |
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02/05/2005 04:54:21 PM · #6 |
Thanks for your replies. They really helped me understand what was going on (or wrong...)
Great site about Canon EOS Flash! |
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