G
Guest
Hi,
Firstly, if you set 'X' on the camera and 'M' on the flash then the camera defaults to its flash setting of 1/60 and I believe that the TTL function is switched off. You have to resort to manual calculations.
If you simply switch to AE Mode on the camera and 'TTL' on the flash the camera will still default to 1/60 while ever the flash is switched on and charged. I believe that in this case the camera will meter the exposure providing that the subject to flash distance being within the flash range.
By switching to A/E mode and operating the Exposure Lock the TTL meter will correctly adjust the flash whilst also giving optimum ambient exposure for whatever aperture you select.
However, if you set too wide an aperture for the film speed & light levels you experience, the camera may set too high a shutter speed (faster than 1/60) and result in uneven exposure.
The formulae for flash is simple: Take the GN (Guide Number) of your flash - for a TLA200 it is a GN of 20 when using 100 iso film and divide by the aperture to get the optimum flash to subject distance in metres. Conversely divide the GN by the subject distance to get the optimum aperture.
Hope that helps,
Clive
Firstly, if you set 'X' on the camera and 'M' on the flash then the camera defaults to its flash setting of 1/60 and I believe that the TTL function is switched off. You have to resort to manual calculations.
If you simply switch to AE Mode on the camera and 'TTL' on the flash the camera will still default to 1/60 while ever the flash is switched on and charged. I believe that in this case the camera will meter the exposure providing that the subject to flash distance being within the flash range.
By switching to A/E mode and operating the Exposure Lock the TTL meter will correctly adjust the flash whilst also giving optimum ambient exposure for whatever aperture you select.
However, if you set too wide an aperture for the film speed & light levels you experience, the camera may set too high a shutter speed (faster than 1/60) and result in uneven exposure.
The formulae for flash is simple: Take the GN (Guide Number) of your flash - for a TLA200 it is a GN of 20 when using 100 iso film and divide by the aperture to get the optimum flash to subject distance in metres. Conversely divide the GN by the subject distance to get the optimum aperture.
Hope that helps,
Clive