lars_bergquist Posted March 30, 2007 Share #1 Posted March 30, 2007 Advertisement (gone after registration) Hi everybody. I have heard some griping about the pre-flash used with M-TTL or 'GN control' (which to me sounds like something you calculate in the head, not like anything the flash does …) The problem sems to be that the pre-flash alerts the subjects so that they stop saying cheese. – Now my question is: How long is the delay between pre and main flash? Does anybody know in quantitative terms, i.e. not just 'too damn long'? Is it worse than the red eye preflash of compacts? The old man from the Age of Flashpowder Link to post Share on other sites More sharing options...
Advertisement Posted March 30, 2007 Posted March 30, 2007 Hi lars_bergquist, Take a look here M-TTL question. I'm sure you'll find what you were looking for!
leicamr Posted March 30, 2007 Share #2 Posted March 30, 2007 I'm not convince that the M-TTL works on my camera. I use a Metz 40 MZ2 with an SCA 3502 M4 SCA adapter. I set the GN, press the M8 shutter release. The flash fires just before the shutter fires and the result ends up as a non flash exposure. The only way I can get the flash exposure is with the flash set to 'A' mode using the flashes inbuilt TTL sensor. Any advise on the M-TTL functionality will be most welcome. Mark Link to post Share on other sites More sharing options...
robsteve Posted March 30, 2007 Share #3 Posted March 30, 2007 Mark: You might want to check with Metz, but I think you need a newer flash such as a MZ54 to get GN flash with the M8. On the 54, GN shows up on the lcd where the manual power levels are. Link to post Share on other sites More sharing options...
cbretteville Posted March 30, 2007 Share #4 Posted March 30, 2007 My experience with the M-TTL using a Metz 44MZ2 and an SF24D is that 'A' works better. I've stopped using the GNC mode on both my D2 and M8. Much less hazzle with 'A' and better results all around. You still get ISO settings and some other stuff from the camera to the flash via the SCA-foot. Link to post Share on other sites More sharing options...
lars_bergquist Posted March 31, 2007 Author Share #5 Posted March 31, 2007 Thanks, but no answer to my question. I do note however that enthusiasm seems to be pretty limited … The old man from the Age of Flash Powder Link to post Share on other sites More sharing options...
robsteve Posted March 31, 2007 Share #6 Posted March 31, 2007 The delay between the preflash and the camera taking the exposure is fractions of a second but it seems like a long time. It also depends on the distance. If the subject is further away it sometimes has to fire multiple flashes to calculate the exposure. All in it probably takes somewhere around a quarter of a second give or take a bit. As others suggested, the A of the flash works more easily. You also can not dial in exposure compensation when in GNC mode. In regards to GNC and exposure accuracy, I have found it very accurate when I tested it. I am using UV-IR filters on the lenses. A few months back there was a comment that the flash exposures were not accurate using GNC mode if you do not have the UV-IR filter on the lens. Link to post Share on other sites More sharing options...
george + Posted March 31, 2007 Share #7 Posted March 31, 2007 Advertisement (gone after registration) Flash powder, eh . . ? That was good too. Having started like this, let me continue saying that I only have an SF20 and that seems to work fine in A mode - if you really want to use a flash. But it does need some experimentation - and the settings are a bit limited. As to YOUR question on the preflash, no matter what you do it will tend to increase the delay and irritate the natives. And as another asides, for whatever it is worth, I never used it on the D2 or other built-in-flash cameras. After having tested it. Link to post Share on other sites More sharing options...
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