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Thread: Low light + Flash

  1. #1

    Default Low light + Flash

    Hi CSer,

    Can i ask bout flash?

    For eg,
    during a low light situation,
    I use wide open aperture. f2.8 (widest for eg),
    then i use the highest ISO = 1600
    then using AV, my shutter speed is 1/30 (for eg)

    Now, if i mount a 580exII, it will not help in the shutter speed right?
    and the flash will not help in anyway besides the object will have more light on it.

    Am i right to say that?

  2. #2

    Default Re: Low light + Flash

    Your shutter speed can become 1/2000 and.. faster? Flash also does other stuff like catch light?
    Meow!

  3. #3
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    Default Re: Low light + Flash

    1/2000 and your picture will become pitch black. The fastest sync speed for flash is 1/250 only. Using flash allow you to lower your iso, also have faster shutter speed. Put it this way, more light into sensor, thus faster shutter speed can be achieved.

  4. #4

    Default Re: Low light + Flash

    thanks. I try it out. Without flash, my shutter is bout 1/30, with 580ex2 my shutter is 1/60. This is in av mode. I had already set my iso highest, and aperture widest at f2.8.

    I go shaky hands. Anyway to achieve faster shutter speed? I tried tv mode. I can set the speed to 1/200, but when i focus, the f2.8 is blinking. Any issues with that. When i low the shutter back to 1/30, the f2.8 stops blinking.

  5. #5

    Default Re: Low light + Flash

    Not quite sure what body you're using, and exactly what is blinking (check manual and let us know exactly what is blinking), but i suspect the blinking is to warn you of under exposure since you mentioned that you were using TV mode.

    The aperture you set does not affect AF speed in any way.

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    Default Re: Low light + Flash

    Quote Originally Posted by magic1980 View Post
    thanks. I try it out. Without flash, my shutter is bout 1/30, with 580ex2 my shutter is 1/60. This is in av mode. I had already set my iso highest, and aperture widest at f2.8.

    I go shaky hands. Anyway to achieve faster shutter speed? I tried tv mode. I can set the speed to 1/200, but when i focus, the f2.8 is blinking. Any issues with that. When i low the shutter back to 1/30, the f2.8 stops blinking.
    f2.8 is blinking i think because u set ur shutter speed to 1/200 and u r on Tv mode..hence ur aperture couldn't go any wider..

    1 advice for flash photography is to shoot in manual mode..
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    Default Re: Low light + Flash

    Quote Originally Posted by magic1980 View Post
    Hi CSer,

    Can i ask bout flash?

    For eg,
    during a low light situation,
    I use wide open aperture. f2.8 (widest for eg),
    then i use the highest ISO = 1600
    then using AV, my shutter speed is 1/30 (for eg)

    Now, if i mount a 580exII, it will not help in the shutter speed right?
    and the flash will not help in anyway besides the object will have more light on it.

    Am i right to say that?
    yes, absolutely... y? cos the 580exII is not a sun replacement.

    but do note something, if you actually put on a flash unit onto any cam, by default it will automatically go to 1/60 for flash, unless u use AEL or rear sync, causing the background to be darker, and your subject is well illuminated.
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  8. #8
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    Default Re: Low light + Flash

    Quote Originally Posted by magic1980 View Post
    thanks. I try it out. Without flash, my shutter is bout 1/30, with 580ex2 my shutter is 1/60. This is in av mode. I had already set my iso highest, and aperture widest at f2.8.

    I go shaky hands. Anyway to achieve faster shutter speed? I tried tv mode. I can set the speed to 1/200, but when i focus, the f2.8 is blinking. Any issues with that. When i low the shutter back to 1/30, the f2.8 stops blinking.
    ooh, din see this...

    ok, just to add on, like i say before, most camera default will use 1/60 unless you press AEL or use rear sync, or manual mode.

    the truth about this thing is, if you have got shaky hands, then use a tripod. nuff said.

    When the f2.8 start blinking means it goes beyond it's range... for eg, its suppose to use f1.4 but your lens is max f2.8, so its telling you there will be error.

    From what i think now, i guess you are shooting in complete darkness or the background is very dark, and your exp comp is either 0 or +1, cos its iso1600 with a f2.8 setting giving 1/30... but if i was shooting, i might even go 1/4... if my lens have IS/VR or body have stabiliser.

    To let you know your work about... damnit late for work, wat the heck...

    Just to give you a better idea...

    you should illuminate the background, if you have a light meter or maybe just use your camera's, like now, it shows, f2.8 1/30 iso1600. you take a shot, you see if the background is nicely illuminated... if it is, good... next step.

    now to lightup your subject. using the same setting before, you dun use the normal flash sync, instead, use rear sync flash, esp for any speed lower than 1/60, y? cos if you use front sync (forgot the name, since not rear, must be front), you will get your subject over exposed (most of the time), cos your flash goes pop 1st and then it wait for 1/30 or more to close shutter, instead, we should illuminate the background, meaning, shutter open, expose background, flash pop, illuminate the subject, then close, this is especially good if your subject tends to move.

    anyway, try it and you will know what i mean...
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    Default Re: Low light + Flash

    Quote Originally Posted by Dream Merchant View Post
    Not quite sure what body you're using, and exactly what is blinking (check manual and let us know exactly what is blinking), but i suspect the blinking is to warn you of under exposure since you mentioned that you were using TV mode.

    The aperture you set does not affect AF speed in any way.
    not canon user, but i think most camera if it shows blinking mean its beyond the range. like if i set Aperture mode, the shutter blink 1/8000 mean the meter actually read it to need more than 1/8000 but the setting max out, so asking you to do either lower the iso or make the aperture smaller.

    same goes for his f2.8 blinking, probably his lens is f2.8 wide open, so if his 1/30 is ok, when the flash mounts on to force 1/60, his f2.8 need to go f1.4, so the lens can't do it, so the error indicator.
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    Default Re: Low light + Flash

    Quote Originally Posted by Del_CtrlnoAlt View Post
    not canon user, but i think most camera if it shows blinking mean its beyond the range. like if i set Aperture mode, the shutter blink 1/8000 mean the meter actually read it to need more than 1/8000 but the setting max out, so asking you to do either lower the iso or make the aperture smaller.

    same goes for his f2.8 blinking, probably his lens is f2.8 wide open, so if his 1/30 is ok, when the flash mounts on to force 1/60, his f2.8 need to go f1.4, so the lens can't do it, so the error indicator.
    For nikon cameras it indicates 'Lo'/'Hi' for shutter speed and aperture when on Av and Tv mode..'Lo' means u r likely to get underexposed and 'Hi' means over exposed..
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    Default Re: Low light + Flash

    Quote Originally Posted by blazer_workz View Post
    For nikon cameras it indicates 'Lo'/'Hi' for shutter speed and aperture when on Av and Tv mode..'Lo' means u r likely to get underexposed and 'Hi' means over exposed..
    ar, learn something new... i din know that lo hi thing, i thought its some extra feature... like iso tweaker (i am not a nikon user, i am only a holder)
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    Default Re: Low light + Flash

    Quote Originally Posted by magic1980 View Post
    during a low light situation,
    I use wide open aperture. f2.8 (widest for eg),
    then i use the highest ISO = 1600
    then using AV, my shutter speed is 1/30 (for eg)

    Now, if i mount a 580exII, it will not help in the shutter speed right?
    and the flash will not help in anyway besides the object will have more light on it.

    Am i right to say that?
    For Canon (maybe others as well, no experience there), in Tv and Av mode, the camera meters for the available light, then fires the flash as fill flash. So you're right, your shutter speed will not go up.

    To use the flash in full auto mode, use M mode (counter intuitive, I know) set the aperture and shutter speed you want, and then set the flash to ETTL. Use FEC (on flash) to adjust exposure.

    There's an EOS Flash bible out there. Google for it - I don't have it handy. Heavy reading, but lots of good stuff.

    Totally off topic : Del_CtrlNoAlt's sig, was the red triangle to the left in earlier days of CS?
    Last edited by lennyl; 29th July 2008 at 09:31 AM.

  13. #13

    Default Re: Low light + Flash

    I usually shoot manual if using flash... either adjust the shutter speed or appreture depending on the lighting and distance of the subject...manual move is usually in very very low light...eg. near total darkness and my subject is within my flash range.. bounce flash need another set of adjustment...
    Leica M4P/ M2 / Summarit 35mm f2.5 / Summicron C40mm f2 / Kobalux 21mm f2.8

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    Default Re: Low light + Flash

    Quote Originally Posted by lennyl View Post
    Totally off topic : Del_CtrlNoAlt's sig, was the red triangle to the left in earlier days of CS?
    Well, i think now default is avatar on top, you can go Edit Options-Avatar Placement- click left and save settings.
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  15. #15

    Default Re: Low light + Flash

    wow, thats a lot of knowledge to digest.

    I will try google for the EOS bible first.
    Thanks pal.

    I dont really like M mode cos, i have to take note of both the Aperture and shutter speed. and if i forget to adjust, sometimes over/under expose.
    there for i like Av mode, and let them auto adjust the shutter speed for best exposure....

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    Default Re: Low light + Flash

    Quote Originally Posted by magic1980 View Post
    wow, thats a lot of knowledge to digest.

    I will try google for the EOS bible first.
    Thanks pal.

    I dont really like M mode cos, i have to take note of both the Aperture and shutter speed. and if i forget to adjust, sometimes over/under expose.
    there for i like Av mode, and let them auto adjust the shutter speed for best exposure....
    then AEL is your best friend...
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    Default Re: Low light + Flash

    Quote Originally Posted by magic1980 View Post
    I dont really like M mode cos, i have to take note of both the Aperture and shutter speed. and if i forget to adjust, sometimes over/under expose.
    there for i like Av mode, and let them auto adjust the shutter speed for best exposure....
    Actually, when using flash, in M mode and flash in ETTL, the camera will adjust the flash output to make sure you have a perfectly (in the camera's opinion) exposed shot.

    The only way you can be overexposed is if you will be over-exposed even without flash (unlikely), and underexposed if the flash is not going to be bright enough no matter what (e.g. trying to bounce off a 50 ft ceiling).

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    Default Re: Low light + Flash

    Quote Originally Posted by lennyl View Post
    For Canon (maybe others as well, no experience there), in Tv and Av mode, the camera meters for the available light, then fires the flash as fill flash. So you're right, your shutter speed will not go up.

    To use the flash in full auto mode, use M mode (counter intuitive, I know) set the aperture and shutter speed you want, and then set the flash to ETTL. Use FEC (on flash) to adjust exposure.

    There's an EOS Flash bible out there. Google for it - I don't have it handy. Heavy reading, but lots of good stuff.

    Totally off topic : Del_CtrlNoAlt's sig, was the red triangle to the left in earlier days of CS?
    Quote Originally Posted by magic1980 View Post
    wow, thats a lot of knowledge to digest.

    I will try google for the EOS bible first.
    Thanks pal.

    I dont really like M mode cos, i have to take note of both the Aperture and shutter speed. and if i forget to adjust, sometimes over/under expose.
    there for i like Av mode, and let them auto adjust the shutter speed for best exposure....
    There is a workaround, but it is not guaranteed to work 100% of the time. In Av mode, you set your exposure compensation to -1 EV. This means the camera will take a reading of the scene, but instead of metering for correct exposure (0 EV) it will give you a group of settings that will make your image underexposed by one stop (-1 EV). The flash will then fill that one stop for you.

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    Default Re: Low light + Flash

    Quote Originally Posted by calebk View Post
    There is a workaround, but it is not guaranteed to work 100% of the time. In Av mode, you set your exposure compensation to -1 EV. This means the camera will take a reading of the scene, but instead of metering for correct exposure (0 EV) it will give you a group of settings that will make your image underexposed by one stop (-1 EV). The flash will then fill that one stop for you.

    Good work around..but not everytime work.
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  20. #20

    Default Re: Low light + Flash

    flash photography is really a knowledge....

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