Leica User Forum - View Single Post - Leica D2 and Nikon SB-28

leicapfile · 09/04/06, 06:38 PM

Hong Toh,

Just as a curiosity, I did some trials with my D2, mounting the SF24D. Did so when I checked closely the pop up camera flash and could see no sensor there.

Mounting the Metz 54 on the D2, and covering the flash mounted sensor, the pictures were dark, as if no flash mounted. Set on A, it was obvious that the D2 did not communicate properly with the 54.

Took some indoor shots with the SF24D mounted sensor covered. Came out perfect, leading me to conclude that the flash pulse was controlled internally within the D2, with the only possible source for entry of the light being through the lens.

Now, what happens inside and how, I know not. Obviously the light is reflected off/read by something and correct pulse time calculated. But as we both agree, not off the digital sensor.

Therefore, I'd conclude that in order to avoid confusion with what happens with true TTL flash exposure on a film camera, Leica/Metz use the terminology of GNC (Guide Number Control). If you parse GNC, you can see that is what is happening to control the timing/intensity of the flash anyway, under any scenario where the readings take place based on light coming through the lens.

Simply a matter of using terminology that is specific to what is happening and how it occurs.

Best,

Jerry

09/04/06, 06:38 PM	#9 (permalink)
leicapfile Erfahrener Benutzer Join Date: 10/05/02 Posts: 188	Re: Leica D2 and Nikon SB-28 Hong Toh, Just as a curiosity, I did some trials with my D2, mounting the SF24D. Did so when I checked closely the pop up camera flash and could see no sensor there. Mounting the Metz 54 on the D2, and covering the flash mounted sensor, the pictures were dark, as if no flash mounted. Set on A, it was obvious that the D2 did not communicate properly with the 54. Took some indoor shots with the SF24D mounted sensor covered. Came out perfect, leading me to conclude that the flash pulse was controlled internally within the D2, with the only possible source for entry of the light being through the lens. Now, what happens inside and how, I know not. Obviously the light is reflected off/read by something and correct pulse time calculated. But as we both agree, not off the digital sensor. Therefore, I'd conclude that in order to avoid confusion with what happens with true TTL flash exposure on a film camera, Leica/Metz use the terminology of GNC (Guide Number Control). If you parse GNC, you can see that is what is happening to control the timing/intensity of the flash anyway, under any scenario where the readings take place based on light coming through the lens. Simply a matter of using terminology that is specific to what is happening and how it occurs. Best, Jerry