Speedlite 580EX II E - TTL mode problem

Hello

My speedlite has recently started to produce photos that are underexposed in E - TTL mode. Compared to the previous pictures, the difference is of about 2/3 - 1 full stop.

I have done a number of tests using my EOS 40 d and an EF 24-105 f4/L IS USM lens.

I used the fully charged batteries in the camera and speedlite (two alkaline batteries or NiMH in flash). I checked the exposure compensation and flash exposure compensation settings as well as all other parameters of the menu camera and custom in the speedlite and camera functions. Everything is in order and there is no conflict between the camera and the speedlite.

I shoot in RAW and as a test, I took a number of pictures in the manual, Tv and Av modes, both without flash and using the flash on the camera. All were well exposed (with no exposure or flash exposure compensation).

I tried recycling the speedlite to full power several times - time 5 seconds. Thus, it seems that the batteries were working well.

I then carried out a number of tests in the manual, Av and Tv modes at various shutter opening and ISO settings to compare flash shipped with the speedlite E - TTL mode performance. Each of the photos taken with the built-in flash has been well exposed with a good histogram. Each comparison with the speedlite photo is underexposed, with a bad histogram and reduced file size. With some tests, it was necessary to set the exposure compensation to + 2/3 to + 1 stop flash to achieve results globally comparable to the onboard flash.

However, this workaround solution produce satisfactory results for the subject distances over 20 feet, even at high ISO and long shutter speeds. The output of the speeedlite was much too low. These tests were done inside.

Then, I made tests with the speedlite in manual mode with all of the production in full. A range of shutter speeds, apertures and ISO settings photos were completely blown out. The same result was obtained with the speedlite in sync and manual high speed selected if the shutter speed is equal to or less than 1/250 second (max height available for the on-board flash shutter speed).

As a solution, I put the manual speedlite with sync high speed and set faster than 1/250 second shutter speeds and

tried the exhibitions at different distances from the object. In General, the sync high-speed kicks. I have not yet checked performance to subject more than 30 feet, but a comprehensive exhibition was obtained in all tests to date, (mostly better with flash exposure compensation of-1/3). However, according to the ambient light auto focus was sometimes impossible.

These tests, it seems that the device works well, the speedlite is capable of generating a full release and in manual/high-sync mode, it will produce a correct exposure with high shutter settings.

While the two workaround solutions - E - TTL mode with timing of compensation and flash exposure manual/high speed - work, some experiments are required and both have their drawbacks. There are moments where I would like to make with the speedlite in manual, but for the most part, I was pleased with the results in E - TTL mode and I want to be able to restore my speedlite complete state.

I wonder if anyone can shed light on fault (sensor/transistor?) and repair.

I'm sorry to have provided a lot of details, but I wanted to avoid unnecessary questions or solutions that I've tried. Any assistance from members who are aware of this problem would be greatly appreciated.

It is not a fault. It seems that if the flash does not work correctly.

You realize, not you, the ETTL flash works differently in mode to manual exposure, it does in the automatic exposure modes?

When you have the ETTL flash game and the camera to Tv or Av or P, the camera will expose by ambient light as if the flash is not there, and the flash is treated as a FILL light. The flash output is reduced by something like 1.5 or 1.7 stops full power, unless you overrided with + or - Flash Exposure Compensation.

When you have the flash in ETTL and Manual, the flash is FULL and processed by the camera, as if it were the only light source. The ambient light is ignored (but according to the selected parameters can still be a factor in your images). Once more, you can substitute with FEC, if you wish.

If I read your description, you see the difference between manual/FULL flash and AE/TTL. As long as you keep in mind these, you can configure the camera and flash in ETTL mode easily to many different situations.

You will notice that the flash often recycle much faster when it acts as a FILLER, because it is drawn to the decline in production. I often use the fill outdoors during the day and can get two or three 'pop' quick lightning before it slows down for recycling.

If you want the 580EX II to recycle faster, use of quality instead of alkaline batteries rechargeable batteries. For faster recycling, a CP - E4 battery pack is a nice addition. He added 8 AA plus size batteries that flash can appeal.

I never use the built-in flashes, so I don't really know how they compare.

***********
Alan Myers

San Jose, California, USA.
«Market softly and carry a great lens.»
MATERIAL: 5DII, 7D(x2), 50D(x3), some other cameras, various lenses & accessories
FLICKR & REPROGRAPHY

Tags: Canon Camera

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