@ neuartig, MFG, Knofie und alle andern, die Probleme haben ...
Zur Blitztechnik der Nikon D1X, die bis vor kurzem das Topmodell von Nikon war, schreibt das renommierte Magazin "PHOTOGRAPHIE":
"Erste Praxistests zeigen bei den neuen Modellen in der Tat eine Verbesserung, auch wenn das Optimum noch längst nicht erreicht ist"
Hier das sehr ausführliche und technisch aufschlussreiche Antwortschreiben von Canon, das ein User hier gepostet hat. Obwohl es ein "altes" Modell betrifft, sind darin die technischen Vorgänge gut beschrieben. Sie unterscheiden sich in einigem vom klassischen analog-TTL, und wie Canon schreibt, ist es wichtig zu wissen, was die Cam in der jeweiligen Situation "denkt"; dann habe man auch weniger Probleme ... Im Prinzip misst die Dynax 7D genau gleich, und wer den zitierten englischen Text wirklich durcharbeitet, dürfte einiges verstehen, was ihm vorher unerklärlich war.
Ich gehe aber mit den Kritikern einig, dass die komplexe, (über-?) intelligente Berechnung zu inkonsistenten Resultaten führen kann, wenn man nicht genau versteht, was die Cam macht.
Ausgedeutsch steht unten z. B., dass die Canon D30 (und wohl auch alle Nachfolger) ...
+ KEINEN TTL-Sensor hat, der das vom Bildsensor reflektierte Licht messen könnte
+ Dass man deshalb die gewohnten (alten) TTL-Blitze nicht mehr verwenden kann
+ Dass die Blitzbelichtung auf den Informationen des gerade aktiven AF-Sensors beruht (Das gilt auch für die Dynax 7D! @neuartig: sind Deine unterschiedlichen Belichtungen darauf zurückzuführe, dass bei verschiedenen Pics vom gleichen Motiv mal dieser, dann jener AF-Sensor aktiv war?)
+ Dass der Kameracomputer also entscheidet, welchen Teil des Bildes er "richtig" belichten will (in Kombination mit dem gerade aktiven AF-Feld)
+ Dass die Kamera-Algorithmen je nach Situation, AF-Art und Blitzmesstechnik variieren
ZITAT06-03-2001, 05:57 AM
Dear EOS D30 User,
We have checked your EOS D30 for flash exposure problems and have found that the exposure and all functions are within the factory specified standards. please take the time to read the following letter. It contains a wealth of information on use of the EOS D30 with the Canon Speedlite EX series flashes.
We hope you enjoy your Canon product for many years to come.
The EOS D30 has no sensor to read flash illumination reflected from the CMOS during exposure. If you want auto flash exposure through the lens, you must use one of our EX-series Speedlites. Top of the line right now is the 550EX, and we also offer 420EX, 220EX and Macro Ring Lite MR-14EX. (We had a 380EX that was replaced recently by the 420EX.) For more info on these products including specs, check out our web site at:
http://www.usa.canon.com/camcambin/cameras...litc/550ex.html
...and go from there. You can combine manual shutter speed and aperture settings with auto flash exposure on the D30 together with any EX-series Speedlite, and you won't have to dial down the flash exposure compensation unless you're trying for a special effect.
* When the lens is set for AF, E-TTL flash exposure is based primarily on the metering zone covering the active focusing point.
* In the case of FEL with the D30, flash exposure is always measured from the center of the picture area, with a metering zone that roughly corresponds to the partial metering circle in the viewfinder.
With these concepts in mind, the next issue is how to determine the active focusing point. The D30 offers 2 basic methods of focusing point selection: manual and automatic.
* When the photographer manually selects an individual focusing point, E-TTL flash exposure remains linked to that point regardless of changes in composition prior to exposure. This is why FEL is so valuable in 'focus lock & recompose' scenarios.
* When the D30 is set for automatic focusing point selection, the camera's algorithm for selection varies according to the user-selected AF mode. When One-Shot AF is combined with automatic focusing point selection, the camera selects the closest readable subject. When AI Servo AF is combined with automatic focusing point selection, the camera expects the photographer to identify the main subject. To do this, the outer focusing points are shut off at first. Once the center focusing point has picked up a subject, the outer focusing points are activated and the D30 is then able to track subject movement from the center to the left or right as well as from near to far or vice versa. When the D30 is set for automatic focusing point selection in One-Shot AF or AI Servo AF, E-TTL flash exposure tracks from point to point along with the AF system.
It's obvious that no single arrangement can work perfectly for every conceivable flash photo, but the range of settings available do cover the vast majority of typical shooting situations.
Here's an analysis of the choices:
1. When you're working with a still subject and there's plenty of time to set up the shot, consider FEL as the best choice because it allows complete freedom in composition under this situation.
2. For point-and-shoot simplicity with stationary subjects, consider E-TTL set for One-Shot AF together with automatic focusing point selection.
3. When you're working with subjects moving laterally across the frame and you are using flash, consider E-TTL combined with automatic focusing point selection. This combination of settings allows the D30 to give you as much assistance as possible in terms of placing maximum metering sensitivity, act the active focusing point.
The choice of One-Shot AF or AI Servo AF with automatic focusing point selection is up to the photographer, but we would suggest trying both to get a feel for how well they work in specific applications.[/quote]