Flash with telephoto lens


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munkey

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Apr 25, 2007
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#1
Hi all, simple question before knocking off..

Assuming I was using the 70-200 IS, and a 580ex CANON, for some indoor photography. Would You switch the IS on or OFF, with the flash already firing that is.

Been bugging me for a while, haha thanks.
 

nixontkl

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Nov 12, 2007
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#2
its pretty much up to yourself if u want the flash or no flash to keep the natural color of the setting.

IS just help u stabilize your shots, thus allowing u to shot at slower shutter speed but if your subject is moving around, u will need faster shutter speed and the flash comes in to help u brighten up your picture, with faster shutter speed the need for IS is not a must unless you are shooting at the tele end, as small shake can easily blur a picture even if your shutter speed is 1/60 with flash thus the IS will help in this case
 

GavinTing

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Oct 16, 2007
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#3
IS also helps you to compose your shot, and makes it "easier to focus" for me, as I can aim properly
 

munkey

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#4
Ok ok so i assume that once you are using a lens with IS, the IS function is almost always on? yes/no?
 

gymak90

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Jan 5, 2008
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#5
Why switch off IS when it helps you to shoot at slower shutter speeds?

It is highly unlikely with flash, you can reach shutter speeds of 1/focal length indoors.

IS should be switched off when you mount lens on a tripod.
 

J-Chan

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Sep 21, 2005
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#6
depends on how much ambient light you want to let in.. more ambient = longer shutter speed = IS useful
 

GavinTing

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#11
1/1000 is the time taken to "record" the picture. Framing is the process where you look into your viewfinder, and compose and focus.. It takes quite some time to do this.
 

munkey

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Yup I figured i'll just leave it on all the time, except with the tripods. Trivia - would a 580 bounced reach up to the 200mm focal? I dont really get the Guide Number jargon. bahhh RTFM
 

lennyl

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#13
Yup I figured i'll just leave it on all the time, except with the tripods. Trivia - would a 580 bounced reach up to the 200mm focal? I dont really get the Guide Number jargon. bahhh RTFM
The distance to subject is the important part, not the focal length (except when we're talking about ultra wide angles and the inability of flash to cover the whole frame).
 

GavinTing

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#14
Yup I figured i'll just leave it on all the time, except with the tripods. Trivia - would a 580 bounced reach up to the 200mm focal? I dont really get the Guide Number jargon. bahhh RTFM
GN refers to the distance. for example, GN of a 580EX is 58m. This means 58m at ISO 100, 50mm 1.4 I think. Can't really remember.

It really depends. How high are you bouncing? What kind of photos are you taking? a 200mm used to take a house, or to take a face-shoulder portriat? or macro of ants? Yup. it all depends
 

munkey

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#15
Okayy simple scenario im shooting at 200mm to get a headshot of the guy on the stage/podium. Im standing say 20-30m away .. bouncing 45 deg, it should reach rightttt
 

lennyl

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#16
Okayy simple scenario im shooting at 200mm to get a headshot of the guy on the stage/podium. Im standing say 20-30m away .. bouncing 45 deg, it should reach rightttt
Guide number = distance * f-number at ISO 100 (according to Wikipedia)

For 580EX/EXII, your GN is 58, if the flash is zoomed in all the way.

For subject 20-30m away, your light has to travel 30-40m. You will lose quite a lot of light bouncing as well.

At that distance you're better off illuminating directly. And if you have strong backlight, you'd want to do what wildlife / bird photographers do and use a Better Beamer :)
 

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