Hiee Pals...
Juz got off a conversation and some casual trials with the 7D with a contact....and then rviwed again on weather there is actualy anything wrong with the Dynax 7D metering in Manual Mode "M" with flash.
It really look like there is actually nothing wrong. Why? Lets see...here are some pointers...to consider...
In Manual Mode (M):
Case 1a: Without Flash - Assuming Without Flash in a Dimly Lit Room
User will play/tweak the Aperture and Shutter to make the indicator move to center for a "properly exposed shot". Let say the Settings were as follows: Tv:10" Av: f4.5
Case 1b: Without Flash again - Now in the same room, with a light on the ceiling turned on.
Now based on the Photographer's choice of keeping the Shutter Speed same - Tv: 10"
now the new aperture that corresponds to the same exposure with the light is now at Av: f13.
**The above examples do not have flash as main source of illumination.
Case 2a: Now With Flash (either pop up or 3600/5600) in the same Dimly Lit Room
Now, the metering indicator shows fixed center point on the metering scale. Why? Probably because now the camera (Come on after paying $2500 for a body you would expect some level of automation wonders here....) will "DIE-DIE!" take the shot ...in the dim room...with flash.... And get a properly exposed shot. Hence this equates to the metering indicator to be always in the center. As long as the subject is within the power coverage of the flash, then it will take the shot properly exposed. Therefore.....the camera is now telling you that...
- Okay Leave it to me...I'll do the job....!!!!
With the flash on board or mounted e.g 3600... If the photographer decides to choose the max shutter speed....i.e...the shutter will go to its max at Tv: 1/125sec. Now If the user tweaks the aperture....As long as the flash power is sufficient based on the distance + Aperture combo at specific ISO, the image should be correctly exposed.
However, If the shutter speeds chosen is really slow....say 15sec....and the subject distance is within power range, the subject e.g 1.5metres will be lit with the first blast of flash at exposure time.....and the rest of the 14++ sec or so will then be ambient lighting (maybe from TV or street light etc).....
So if let say i wanna play with DOF then with the specific Shutter speed like flash sync (Tv:1/125sec) i just need to play with aperture ......
From the above cases, it can then be seen that it make sense that the metering indicator in the viewfinder stays in the middle if flash is used in M Mode.... It will move unless the photographer dials in EV compensation +/- which will move the needel left or right respectively. Power of the flash is adjusted during exposure time to ensure the metered scene is properly exposed.
Do feel free to talk more about this....if you think otherwise...
NOTE: Seems like Most of the Under Exposures experienced may be due to using lower guide numbered flash....(using pop up flash) with a combo of small apertures....
rgds,
sulhan
Juz got off a conversation and some casual trials with the 7D with a contact....and then rviwed again on weather there is actualy anything wrong with the Dynax 7D metering in Manual Mode "M" with flash.
It really look like there is actually nothing wrong. Why? Lets see...here are some pointers...to consider...
In Manual Mode (M):
Case 1a: Without Flash - Assuming Without Flash in a Dimly Lit Room
User will play/tweak the Aperture and Shutter to make the indicator move to center for a "properly exposed shot". Let say the Settings were as follows: Tv:10" Av: f4.5
Case 1b: Without Flash again - Now in the same room, with a light on the ceiling turned on.
Now based on the Photographer's choice of keeping the Shutter Speed same - Tv: 10"
now the new aperture that corresponds to the same exposure with the light is now at Av: f13.
**The above examples do not have flash as main source of illumination.
Case 2a: Now With Flash (either pop up or 3600/5600) in the same Dimly Lit Room
Now, the metering indicator shows fixed center point on the metering scale. Why? Probably because now the camera (Come on after paying $2500 for a body you would expect some level of automation wonders here....) will "DIE-DIE!" take the shot ...in the dim room...with flash.... And get a properly exposed shot. Hence this equates to the metering indicator to be always in the center. As long as the subject is within the power coverage of the flash, then it will take the shot properly exposed. Therefore.....the camera is now telling you that...
- Okay Leave it to me...I'll do the job....!!!!
With the flash on board or mounted e.g 3600... If the photographer decides to choose the max shutter speed....i.e...the shutter will go to its max at Tv: 1/125sec. Now If the user tweaks the aperture....As long as the flash power is sufficient based on the distance + Aperture combo at specific ISO, the image should be correctly exposed.
However, If the shutter speeds chosen is really slow....say 15sec....and the subject distance is within power range, the subject e.g 1.5metres will be lit with the first blast of flash at exposure time.....and the rest of the 14++ sec or so will then be ambient lighting (maybe from TV or street light etc).....
So if let say i wanna play with DOF then with the specific Shutter speed like flash sync (Tv:1/125sec) i just need to play with aperture ......
From the above cases, it can then be seen that it make sense that the metering indicator in the viewfinder stays in the middle if flash is used in M Mode.... It will move unless the photographer dials in EV compensation +/- which will move the needel left or right respectively. Power of the flash is adjusted during exposure time to ensure the metered scene is properly exposed.
Do feel free to talk more about this....if you think otherwise...
NOTE: Seems like Most of the Under Exposures experienced may be due to using lower guide numbered flash....(using pop up flash) with a combo of small apertures....
rgds,
sulhan