Advice on flash photography
- Thread starter enyu
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Problems with flash ... I always wonder how is the camera gonna calculate flash output power when most of us adopt the bounce or angled flash?
I noticed that once you tilt your flash, the distance meter on the flash will not be able to detect the distance anymore. And since the flash is going to be bounce there is no way for the camera to know how high or reflective is the ceiling so it cant really know and control the output power right? In that case, the TTL or ETTL feature is pretty redundant isnt it?
Is my understanding correct?
I noticed that once you tilt your flash, the distance meter on the flash will not be able to detect the distance anymore. And since the flash is going to be bounce there is no way for the camera to know how high or reflective is the ceiling so it cant really know and control the output power right? In that case, the TTL or ETTL feature is pretty redundant isnt it?
Is my understanding correct?
there is an EL button on the D70, Hope I was doing the right thing, I point at the place that i wanted the camera to meter & have correct exposure, pressed the EL button and than focus on my subject who is under shade and shoot with fill flash, hoping that the SB-600 TTL will the rest for me.
I don't know how it works in Canon (eTTL), but in Nikon with iTTL, it will do pre-flash before the real flash. From the pre-flash, the camera (and/or flash) will determine the correct output from flash to iluminate subject. This mean, in bounce or angled flash, the flash will still correctly iluminate the subject.ianpaice said:
Regards,
Arto.
enyu said:
no la i only use 12-24 on the scenery mostly... all the performance were shot using 80-200 at f2.8 and iso 1600 (very inconsistant lighting, so i don wanna risk going at iso800 which sometimes can't even achieve 1/40")
and yes all without flash except on the gal who got scorpio on her body. the contrast was very poor without flash so i ended up using built in flash
enyu said:aperture mode... plse advice am i doing the right thing
camera should have been able to select the shutter speed (up till 1/500s x-sync speed - D70 does not support high speed flash sync unlike the higher end Nikon bodies) to properly expose the background.
next time u try, meter with and without flash and see the results (shutter speed). if even at the limit of 1/500s and lowest ISO, the background is still overexposed at the aperture used, you either have to step down or add neutral density (ND) filters.
Set you flash in "iTTL BL". Usually we under-exposure flash for 0.5-2ev, depends on your like. Set your camera metering on "Centre Weight". Focus on subject. Press EL button to lock exposure. Compose. Click...enyu said:
.But I suggest you not to take photo when the sun is on the top. Pity the subject, also not so good lightning (too strong, unless there are much clouds). The good time is morning (before 11:00am) and afternoon (after 4:00pm). With plenty of white clouds.
Regards,
Arto.
ianpaice said:
Not really right. Showing the distance on the flash is separate from the ability for proper flash exposure.
Under ETTL, whether you tilt or not, the camera fires a pre-flash and "measures" this reflected pre-flash to determine the duration of main flash needed for proper flash exposure and fires off the main flash accordingly.
Under TTL (through the lens), whether you tilt or not, the camera "mesasures" the reflected flash through the lens to determine the proper flash exposure and cut off the flash accordingly.
do i adjust my aperture (in aperture priority mode) until i get a corrersponding shutter speed of 1/60s (flash speed) so as to get correct exposure. ?
between f1.8 to f5, i am getting a HI (over-exposed sign)
between f5.6 to f16, i am getting a shutter speed from 1/500s down to 1/60s, with a correct exposure sign
anything above f18, i am getting an under-expose sign ,
am i right to say that i can use any aperture between f5.6 ~ f16 and my pic will be correctly exposed ??
(SB-600 set to TTL/BL and D70 flash mode set to TTL.)
between f1.8 to f5, i am getting a HI (over-exposed sign)
between f5.6 to f16, i am getting a shutter speed from 1/500s down to 1/60s, with a correct exposure sign
anything above f18, i am getting an under-expose sign ,
am i right to say that i can use any aperture between f5.6 ~ f16 and my pic will be correctly exposed ??
(SB-600 set to TTL/BL and D70 flash mode set to TTL.)
I can distinguish between pre-flash and real flash. Pre-flash is not a single burst. It is several bursts (looks like strobe), while the real flash is single burst (and, while not always, it is usually brighter). Yes, there is a delay between pre-flash and real flash.ianpaice said:
Also real flash is together with shutter release 'snap' sound. So if you look at viewfinder, when you press shutter release, you will see the pre-flash (and not the real flash) in the viewfinder.
Regards,
Arto.
err... this is weird. On my system, I cant distinguish between preflash and manin flash (20D with 580ex). There is no several strobe of light when using the 580ex. If using the in-flash, there is several strobe of light but I thought that is only used to help the camera to acheive focusing?
Bro artosoft, what equipment are you using?
Question to all:
What is the purpose of pressing the "FEL" button when I thought ETTL will automatically fire a preflash for each shot?
Bro artosoft, what equipment are you using?
Question to all:
What is the purpose of pressing the "FEL" button when I thought ETTL will automatically fire a preflash for each shot?
Artosoft said:
there is a diff in exposure between my SB-600 to iTTL & iTTL/BL mode, although the BL (Automatic Balanced) mode is suppose to automatically adjust the flash output power so to have a well balanced exposure of the main subject & bkgnd, but i noticed the pic seems to be a bit over-exposed when i used iTTL as compared to iTTL/BL mode on both centre-weighed & matrix metering mode, is this normal ??
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