Rumors > Speedlites, Printers, Accessories
Continuous blow out, with ETTL troubleshooting
DHL1313:
I have 2 580EXII's. One of them I blew up with a pocket wizard using the HSS too much. Canon fixed it but every now and then it does the same thing. I just open the battery door, then it resets. I need to send in 5D3 for metering thing and I'm sending the flash in with it. If no luck I'm getting all 600's.
muldereric:
Try using a pre-flash to determine exposure when using your 580's in a dark(er) environment. If you have the 5D3 it can be triggered using the M.fn button (next to you firing button). It causes your flash to fire while your camera records over- or underexposure when actually flashing. It adjusts it's settings and fixes them for the upcomming shot (indicated by the * you see in your viewfinder's display).
Edit: Small question. You flashing straight towards your "object", or have you tilted/rotated your flash aiming somewhat towards the ceiling? If tilted upwards, you using the flash's white bounce card?
olivander:
I shoot straight no bouncing, or rotating of the flash head, I don't mess around, and I've tried preflash, it ups the accuracy but I still miss 1/4 of the shots due to incorrect exposure, and then every 5/10 shots it'll just go out for the kill with full blow out, no detail stored. It still doesn't expose correctly, I've tried every metering mode, it just won't give me accurate exposure.
I've checked my hot shoe mount, it's not damaged.
I'm sure this problem would be easier to diagnose if I had another flash with TTL.
Biffbim:
I too have very mixed flash results with my 5D3.
First try was using a Yongnuo ST-E2 on the 5D3 and a 580EXII in my hand for fill flash. The flash fired but
the exposure is way, way underexposed. This was in sunlight, spot metering, ETTL, Av, auto ISO.
A thread on dpreview indicates that others have had similar results. The Yongnuo ST-E2 is fine on my 500D.
Second try. Next day I dropped AU$800 on a 600EX-RT and tried some more fill flash in sunlight. This time
I used the 600 on a hot shoe cable. Faces not in full sun exposed well, however, faces in full sun were
blown right out. 3 or 4 stops at a guess.
I'll put this down to me not knowing what the hell I'm doing.
Third try, inside in soft light with the 600EX on a wire bouncing some fill. The 580EXII was group B as a key
with a beauty dish in close and I had a 430EX group C as a rim flash.
I got consistent pleasing results. Maybe I'm getting a clue or maybe the camera in Av is just good at this.
So I wonder why the sunlight fill flash results were so over exposed.
TotoEC:
--- Quote from: Biffbim on May 29, 2012, 05:46:42 AM ---I too have very mixed flash results with my 5D3.
First try was using a Yongnuo ST-E2 on the 5D3 and a 580EXII in my hand for fill flash. The flash fired but
the exposure is way, way underexposed. This was in sunlight, spot metering, ETTL, Av, auto ISO.
A thread on dpreview indicates that others have had similar results. The Yongnuo ST-E2 is fine on my 500D.
Second try. Next day I dropped AU$800 on a 600EX-RT and tried some more fill flash in sunlight. This time
I used the 600 on a hot shoe cable. Faces not in full sun exposed well, however, faces in full sun were
blown right out. 3 or 4 stops at a guess.
I'll put this down to me not knowing what the hell I'm doing.
Third try, inside in soft light with the 600EX on a wire bouncing some fill. The 580EXII was group B as a key
with a beauty dish in close and I had a 430EX group C as a rim flash.
I got consistent pleasing results. Maybe I'm getting a clue or maybe the camera in Av is just good at this.
So I wonder why the sunlight fill flash results were so over exposed.
--- End quote ---
I have the 600EX-RT and have not (yet) tested it outside under the sunlight.
I have to ask: were you using spot metering? were you using manual AF point selection? did the main subject get the correct exposure as intended?
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