Will not pre-flash

Yes. You can use the flash in auto or manual mode by setting the camera to manual shutter speed within the x-sync range and then selecting the aperture prescribed by the flash guide number or the displayed automatic f-stop on the flash. The flash can provide auto exposure with the camera in manual mode, but you need to be aware of the amount of ambient light which will not cause any exposure corrections by the camera in this mode. Another alternative is to select Aperture preferred automatic on the camera and the f-stop shown for the auto flash settings. This will allow the camera to vary the shutter speed but may cause long exposures if the camera is not sensitive to real-time flash readings.

Digital Camera Fully Compatible, Newly Developed S-TTL System "S-TTL" enables TTL auto shooting by an external strobe for a digital SLR camera as well as for a point & shoot digital camera.
INON S-TTL auto strobe supports any manufactures' model providing highly accurate exposure control.
Film camera era without strobe selection problem TTL stands for "Through The Lens" and TTL auto strobe system controls flash amount to provide correct exposure based on calculation by camera's internal sensor metering reflecting strobe light from a subject through the lens. This TTL system meters actual light amount reflecting from a subject providing accurate exposure.
When we start with the history of underwater TTL auto strobe, underwater camera?"NIKONOS V" released in 1984 was the first to provide automatic TTL flash control for underwater strobe SB-102, SB-103 succeeded by NIKONOS V compatible underwater strobes form other manufactures. The 5 pin electrical sync connector for NIKONOS V is most popular and widely adopted to connect an underwater strobe and underwater film camera (underwater camera/housing).
A film SLR camera has flexibility to select an underwater strobe. As far as housing has NIKONOS type electrical sync connector and properly wired, automatic TTL flash control is usable with any TTL auto strobe like Nikon SB-105, INON Z-220, Z-22 connected via electrical sync cable.
NIKONOS type 5 pin electrical sync connector and NIKONOS V with INON Z-22 strobe

Film camera compatible strobe is not usable for a digital camera!? Underwater TTL strobe circumstances have been drastically altered with the spread of digital camera among divers. Some underwater housing for digital SLR camera has NIKONOS type electrical 5 pin sync connector as same as film camera housing. Since the housing has same NIKONOS type sync connector, existing film camera compatible underwater strobe has been considered compatible with a digital SLR camera via 5 pin sync cable but happened to experience error message on the digital camera or blackout on an image even the strobe worked. Why this happened?
This is because automatic TTL strobe system difference between a film camera and a digital camera.

The film TTL auto system makes single flash while digital TTL auto system employs pre-flash type making two to three flashes. Film TTL auto strobe system starts firing at the same time the shutter opens and reflecting strobe light from a subject is recived at a film. The reflecting light on the film is metered by the sensor to determine when to cease firing for correct exposure. This process takes only about 1/1000 second.
In contrast, digital TTL auto strobe system can not calculate adequate exposure based on reflecting light from a subject since image sensor (CCD/CMOS) reflectivity is comparably low comparing to a film. So digital TTL strobe system gives preliminary flash for very short period of time (pre-flash) just before the shutter opens metering reflecting light from a subject by the sensor to calculate necessary amount of light for correct exposure and starts emitting main flash at the same time the shutter opens. Canon E-TTL and Nikon i-TTL employs this system.

When we connect conventional film camera compatible TTL strobe to pre-flash type digital SLR via sync cable, the strobe makes full dump by pre-flash signal then the shutter opens before the strobe has been fully charged resulting in quite under exposed image only with ambient light. Even two time flash compatible strobe like INON Z-220 strobe, does not fully support a digital TTL and force to use Manual flash mode.





Film SLR:
A strobe starts firing at the same time the shutter opens and quenches firing when correct exposure has been obtained.
A film compatible TTL strobe connected to a pre-flash type digital SLR via electrical cable flashes does not support TTL auto exposure resulting in synchronization only with first pre-flash or totally uncontrollable.

The birth of digital fully compatible S-TTL S-TTL auto compatible INON D-2000 strobe and Z-240 strobe works in TTL auto mode by simply setting their main dial to S-TTL position. A film camera seems to depend more on photographer's skill, experience and feel since the camera does not allow checking images on site. A digital camera allows us to check images right after shooting and enable to try to shoot again as much as we like. And high capacity memory card further allows to shoot hundreds of images. The digital camera makes entry level of underwater photography getting down and nowadays more people buy a digital SLR camera and underwater housing even they have just started underwater photography. However underwater photography gets more difficult because underwater strobe does not work in TTL auto.
INON is among the first to support digital TTL auto system with "S-TTL" auto mode equipped D-2000 strobe and Z-240 strobe.
The proper name of S-TTL is "Optical Synch TTL". S-TTL enables to perform in TTL auto exposure as same as genuine TTL strobe from camera manufacture, based on camera's built-in flash light to use as a signal to be transmitted to a strobe. S-TTL uses digital camera's built-in flash light not as a light source but as like a controller to trigger S-TTL strobe.
The built-in flash of a digital camera makes weak flash (pre-flash) before main-flash to calculate exposure. This pre-flash is transmitted to S-TTL strobe to control the strobe to make pre-flash to a subject. The reflecting light from the subject goes through the camera's master lens to an image sensor then a processor calculates main flash light amount for correct exposure.?Finally the built-in flash makes main-flash which is transmitted to the S-TTL strobe to cause main-flash of the S-TTL strobe.


Digital camera's built-in flash lights are transmitted via an optical fiber to the
S-TTL strobe to make pre-flash and main-flash instead of the built-in flash.

Your 40D requires that you use an ETTL-II type flash like the Canon 380-EX. What flash are you using?

This one got me too. I assumed it wouldn't need the built-in flash if it was a wireless remote. I still want to know why this is is so. If it needs a pre-flash to set exposure, surely it can pre-flash with the remote SB600?

The flashing is the HIGH KEY area or highlights .Read camera manual on exposure for highlights also read the section on histograms to help you understand the relationship of exposure and contrast.

Flashig areas show HIGH KEY or HIGHLIGHTS in image, these areas indicate where exposure compensation can be made. They also change to normal function on first magnification point.

Check the manual on highlights also good reading in the histogram section and you will start to understand about contrast and exposure.
Have FUN.

GORDO

Use the bracket exposure method. or read the apeture off then up a stop.

I read in another Toshiba forum where some users were putting a small piece of electriacal (black) tape over the flash sensor, and their indoor photos with flash turned out spectacular, since it allows the camera to apply more light . Actually fools the camera but it works. You might want to experiment with it..

The DiMAGE A1 employs three metering modes; ADI (Advanced Distance Integration) flash metering, Preflash-TTL metering and Manual. The ADI flash metering mode combines distance information from the autofocusing system with information from a pre-flash exposure. On the other hand, in Preflash -TTL metering mode, the exposure is calculated with a pre-flash only. Flash emission control is manually selectable in three levels from 1/1, 1/4, 1/8, 1/16. Pre-flash TTL metering must be used when a diffuser is attached to an external flash or a filter to the lens. Attachment of those accessories may cause error in distance information necessary for ADI (Advanced Distance Integration) metering due to reduced entering light. While manual output control is active, pre-flash will not burst.

The ADI flash metering mode combines distance information from the auto focusing system with information from a pre-flash exposure. On the other hand, in Preflash -TTL metering mode, the exposure is calculated with a pre-flash only. Flash emission control is manually selectable in three levels from 1/1, 1/4, and 1/16. Pre-flash TTL metering must be used when a diffuser is attached to an external flash or a filter to the lens. Attachment of those accessories may cause error in distance information necessary for ADI (Advanced Distance Integration) metering due to reduced entering light. While manual output control is active, pre-flash