GRbenji said:
Yes bro. All will affect ambient exposure.
But by using shutter speed adjustments, you can adjust ambient exposure without affecting flash exposure.
Lightings
- Thread starter canonmono
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Yes bro. All will affect ambient exposure.
But by using shutter speed adjustments, you can adjust ambient exposure without affecting flash exposure.
allenleonhart
Senior Member
and seconds this. unless u decided to not have HSS and u overshoot sync speed
this is still relatively managable. wait till u get to zooming flashes hahahaha
GRbenji
New Member
Hi Bert,
This I agree.
But what I meant was one can also use aperture to adjust ambient exposure and then adjust flash power accordingly (or let eTTL meter and adjust flash power automatically).
Hmm, wasn't thinking hard enough on the ambient light would be affected by aperture and iso. Sorry
I've a question though, if I'm on manual flash at 1/128, aperture at F/2.8 & ISO at base (100), if I got my subject overexpos. Without changing aperture (keeping DoF), is there anyway to reduce exposure on the subject? Will a ND filter help?
I've a question though, if I'm on manual flash at 1/128, aperture at F/2.8 & ISO at base (100), if I got my subject overexpos. Without changing aperture (keeping DoF), is there anyway to reduce exposure on the subject? Will a ND filter help?
GRbenji
New Member
I guess that's the only other way. Encounter this previously when I didn't have a handy softbox or wall. The white bounce card in my flash didn't help much either. Since shutter speed does not affect subject exposure in this case, longer exposure should bring back the ambient while not affecting the subject, right?
But I guess with longer exposure means possibly some subject movements + camera shake (e.g. 0"3).
'
hey, thanks for you & the rest for breaking it down further. I don't really go in depth with what systems do what, hand me any camera and flash and I just use it the same way. I did make it a point to say it was the main way when in TS context, since he didn't seem to get that shutter speed would affect ambient light too. There are too many variables and conditions possible to list out, if we're trying to be detailed. I just wanted to give the basic concept and have TS learn from there, understand if you or others think differently. Cheers
GRbenji said:Hi Bert,
This I agree.
But what I meant was one can also use aperture to adjust ambient exposure and then adjust flash power accordingly (or let eTTL meter and adjust flash power automatically).
Yes bro, you are right on the money.
Aperture and iso will allow adjustment to overall exposure (including flash subject and ambient)
Shutter speed only affects ambient.
But this is assuming shooting in M mode with flash on fixed power manual mode.
Of course if any auto mode is selected like Av or Tv or eTTL, the equation changes somewhat.
In Av mode, ambient will stay the same because shutter speed will be auto adjusted by the camera. If flash is on fixed power manual mode, exposure on flash subject will be affected. If flash is in eTTL mode, flash meter will readjust to the new aperture value somewhat.
Hope this helps TS.
spree86
Senior Member
GRbenji said:Thanks Bro Bert. Had a qns for you. Do you set the aperture to suit the flash power or the other way round?
I think it's the other way round. Aperture settings directly affect how your pictures will turn out, it would be better to suit the flash settings to the aperture settings.
Thanks Bro Bert. Had a qns for you. Do you set the aperture to suit the flash power or the other way round?
Bro it really depends on what you are trying to achieve. If you are shooting in a studio with controlled background and lighting, usually set the aperture to suit the flash power (after flash power is set to a reasonable power). If outdoors, and thin DoF is required, flash is adjusted to aperture setting.
just a thought, let's say we have such a scenario here:
Environment indoors with ambiance lighting, normal height ceiling or somewhere around normal HDB height
direct flash with minimum power, widest aperture, iso at 100, shutter speed at 1/60 for minimal or no motion blur
maybe something like a wedding dinner scenario?
exposure on the subject turns out ok, but the background turns out to be dark.
anyone met this kind of situation, or any suggestion?
PS: i've not encountered such situation yet, since i rarely do indoor shooting
just a thought that came up.
Environment indoors with ambiance lighting, normal height ceiling or somewhere around normal HDB height
direct flash with minimum power, widest aperture, iso at 100, shutter speed at 1/60 for minimal or no motion blur
maybe something like a wedding dinner scenario?
exposure on the subject turns out ok, but the background turns out to be dark.
anyone met this kind of situation, or any suggestion?
PS: i've not encountered such situation yet, since i rarely do indoor shooting
just a thought that came up.
Kenneth67C
New Member
Normally you would be shooting with ETTL, so at the very least the subject will be correctly exposed.
If your background turns out dark, then lengthen the exposure, but 1 stop or so.
Occassionally you may actually want it to be slightly darker to maintain focus on your subject. That's when the faster shutter speed helps to underexpose the background, or stopping down by 1/3 or 1/2 stop.
Shutter speed is 1/60 because you are using Av mode? Switch over to M mode and meter for the ambient lighting.
According to my understanding, I believe this scenario applies if you are using direct flash on the subject and the shutter speed is too fast for the sensor to capture the ambient light resulting in black background. Bounced flash (assuming HDB ceiling) should reduce this kind of "alone in the dark" effect.
*Not sure if my understanding is right. Been reading up some flash articles on David Lee's blog (please correct me if wrong :sweat
*i'm considering shutter speed to be 1/60 for the scenario where the subject is not stationary, thus 1/60 to minimize motion blur from the subject.
actually i should be thinking any shutter speed is fine so long i don't get any motion blur from the subject?
but too long a shutter speed will get motion blur from the subject, although trade-off gets the background will get better exposed?
According to my understanding, I believe this scenario applies if you are using direct flash on the subject and the shutter speed is too fast for the sensor to capture the ambient light resulting in black background. Bounced flash (assuming HDB ceiling) should reduce this kind of "alone in the dark" effect.
*Not sure if my understanding is right. Been reading up some flash articles on David Lee's blog (please correct me if wrong :sweat
i'm thinking if bouncing the flash from the ceiling or using a sort of diffuser/soft box will help, any ideas?
GRbenji
New Member
Let assume your scenerio and settings are facts. Doesn't matter whether in Av, Tv or M mode, as with this combination you get this exposure issue.
1. If the ambient or background is under and aperture already widest, nothing you can do to the aperture other than changing to a faster lens. The other options are either slow down the shutter or raise ISO.
2. Slowing the shutter will not affect the flash, but as you've mentioned may cause motion blur. So unless subject is relatively in the shadow and the flash can freeze it, this option may be out too.
3. Raise ISO will affect flash. And since flash is already at the lowest power, you can't lower it further. So either have a less powerful flash, diffuser it or bounce it.
Options are always limited when you are at the limits of your equipment.
PS - of course one can use many slave flashes to light the entire scene up too.
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