Then, upon closer inspection, I noticed that if I set the shutter for 1/160 and Aperture for say, F1.8, when I press the shutter halfway down, the camera picks it's own shutter speed and aperture to get the right exposure. I used the canon speedlite to test all this.
Is there something wrong with my code? I really want to be able to lock the shutter speed and aperture and have the flash do the adjusting. Seems to be working backwards right now. Any assistance would be greatly appreciated.
I'm obviously way out of my league on this one. Is there a help file or area that could take me through the process? Does anyone here fix code for monetary compensation? I have a dive trip coming up and I'd really like to get this fixed.
Just for clarification, eTTL works in auto Av, And Tv mode out of the box without CHDK. I really need it to lock the settings I choose with the wheels and adjust the flash power only....
I want to be able to select the shutter speed and aperture using the wheels on the camera. Whatever I choose I want it to stay locked until I modify it using the wheel (just like M mode does today) with those "fixed" I want the camera to meter the flash for proper exposure. DSLR have this feature available in Av, Tv, AND M mode. Some other point and shoots (Olympus for example) activate eTTL in M mode. Canon doesn't activate this by default. I'm pretty sure their thinking is they don't want their high end point and shoots to eat into their SLR market.The eTTL should turn the flash on then do its best to give proper exposure by turning off the flash before the image over exposes. There has to be a way to be able to do this. In Av And Tv mode, when you press the shutter halfway, the user selected shutter or aperture is locked, the camera selects the free variable (if in Av mode the camera would select the shutter speed for example) so before I even press the shutter fully, the shutter speed and aperture are locked. When the shutter is pressed, the camera turns the strobe on until the picture is properly exposed and then shuts it off.All that would be different here is that instead of the camera picking one of the variables, I pick both using the wheels and the camera ttl logic handles the strobe power/time.
Sport divers get away with what they have because they're not interested in the control over the photos some people want. Some people want to control motion blur and depth of field. Most photo divers are happy if a picture just turns out . The people who really care get really expensive SLR's.
I wish we could view the actual camera firmware. I have a feeling the base firmware is the same on the G15 as the SLR's they just deactivate a bit in the firmware to remove a mode or feature.
I tried this on my G12 & G1X by modifying the C code rather than using a script.
Normally setting the camera to M mode sets the external flash to Manual as well; but by forcing the PROPCASE 121 to 0 it switches the flash to Auto mode.
Quote from: philmoz on 27 / June / 2013, 07:27:02I tried this on my G12 & G1X by modifying the C code rather than using a script.Did you go that route because you could not get a script version working? Or was it just easier for you?
QuoteNormally setting the camera to M mode sets the external flash to Manual as well; but by forcing the PROPCASE 121 to 0 it switches the flash to Auto mode.Is thjs general enough to be a candidate for a "built-in" CHDK feature?
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