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Settings on camera when using 580EX II
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I bought a few months back the 580EX II and I must say, I love it. A great flash and has taken my photography to new levels. Although I'm still new at using this flash, their is something that I haven't been able to figure out yet and maybe someone can offer some advice.
If I use for example, my Canon 50mm f1.8 lens with the flash, I would tend to set my camera to AV mode with the aperture around 2.8 or lower, depending on what I want to shoot. If I'm doing people shots indoors, this has worked in my favor at times. If I change my settings to M mode, I notice that it's showing I'm underexposed by 2 stops, even if I haven't changed the aperture and I have a shutter speed of about 1/80. The pictures still come out great but I was wondering why it is that it's flashing I'm underexposed. Does the flash compensate for that? Guess I'm missing something here. Thanks for the help...
Posted at 9:07PM, 9 March 2008 PDT
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In Av mode, the flash acts as a fill-in flash. In M mode, it will be using ETTL. Set the aperture and shutter speed to the desired setting and the flash will adjust its power for the right exposure.
Posted 51 months ago.
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Ah that's why. OK. That makes sense. All the more reason to shoot mainly in M mode instead of AV. Thanks for the help.
Posted 51 months ago.
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I have a rebel Xti and a bought a 580ex II Flash , for know I thing I did a bad chose...because is not working with E-TTL just TTL so I will like to know if I can use this camera in M mode like that :Set the aperture and shutter speed to the desired setting and the flash will adjust its power for the right exposure.
Thanks
Posted 51 months ago.
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how do you know your XTi is not doing ETTL?
Posted 50 months ago.
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Aubrey_Williams [deleted] says:
XTI's don't support ETTL with the 580s.
I shoot ETTL with a 40D almost always.
Posted 48 months ago.
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This might be helpful regarding the XTI,
www.imaging-resource.com/PRODS/XTI/XTIFLASH.HTM
according to that, the XTi supports ETTL ll with the 580EX ll.
Posted 48 months ago.
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All Canon DSLRs i support E-TTL...
Shadou: have you got an example image of your 2 stop underexposure? I can't see why this would happen, unless:
- you don't have enough power to light your subject (check flash exposure confirmation light)
- the subject is very white (in which case you need to dial in FEC)
Fill in flash isn't determined whether its in Av or M mode, its determined by the EV of the scene, Canon unfortunately doesn't disclose to its users how it calculates it unfortunately (1-series camera has the option to disable this). i.e bright/high EV scene - flash will "fill", dim/low EV scene - flash will aim to correctly expose.
Great link here:
photonotes.org/articles/eos-flash/
Posted 48 months ago.
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the full function of ETTL II is dependent on the type of lens attached to the camera body since ETTL II takes distance information from the lens to calculate the flash output in relation to the zoom factor for both the flash zoom head and the lens zoom factor. It computes both variables and decides on the proper flash power output to use depending on the EV you set.
Also, pay attention on your metering mode, if you used spot and aim it on a dark tux with a bride, the bride's gown will be overexposed.
set metering to evaluative.
Posted 48 months ago.
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Something strange I noticed once is when I used my 100mm macro with the 580 it said the zoom distance was 80mm....unless I was doing something wrong (I've only had it about a month and still trying to figure it out).
Posted 48 months ago.
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The rebel is a Type A camera and can fully utilise the 580 EX II functions. I just picked mine up yesterday and have no idea how it works just yet but I have faith and you should too. Time, practice and perseverance and all becomes clear eventually :-)
Rebel xti user guide confirms the rebel is compatible for any doubters, p.152 :-p
You can also download the guide if you have lost it like I have lol
www.usa.canon.com/consumer/controller?act=ModelInfoAct&am...
Originally posted 47 months ago.
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ΛεωνÃδαs edited this topic 47 months ago.
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