Thursday, 1 July 2010

Flash and max shutter speed

I have started reading a book by Neil Van Niekerk, a South African wedding photographer based in New Jersey USA (see Blog link: Planetneil).

The book explains techniques on use of 'on camera flash' in which he explains the benefit of using the camera maximum flash sync speed, on my canon 5D MKII this is 1/200 sec, as the datum then adjusting the other parameters to suit to enable the ambient background light to be seen whilst using the flash in TTL mode to fill in at it's optimum efficiency, thus improving battery life, recycling speed and a fast enough shutter speed to reduce camera shake.

in the following Images which I have taken to show this effect I used my ever willing model (my daughters make up doll) with one 100w bedside light set at 90 degrees to the models left (right of the images) creating some tungsten side and ambient light. all of the following image are uneddited apart from converting to Jpg. As I always shoot in RAW I have plenty of scope for editing for white balance etc.

F/4.0
1/4 sec
ISO 800
3100k / cloudy

we can see here a warm colours prevailing in the ambient light, with no flash and plenty of modelling on the face. a slightly soft image even with the help of IS on the Canon 24-105mm lens



F/4.0
1/200 sec
ISO 1600
5550k/ Tungsten

we can see not much change in ambient lighting, but because of the the faster shutter speed I think a noticeably sharper image and better modelling because of the bounced fill flash



the following set shows that the only changed parameter is the shutter speed, the fill flash is taking up the slack filling in / adding to the ambient.

f/4.0
1/8 sec
ISO 2000
5550k / Cloudy
no flash


f/4.0
1/8 sec
ISO 2000
3100k / Tungsten 
no flash



F/4.0
1/200 sec
ISO 2000
5550k / cloudy
bounced fill flash over my left shoulder and 45 degrees up, again I think noticeably sharper. You will notice that the ambient lighting is still present in the background.

F/4.0
1/200 sec
ISO 2000
5550k / cloudy 
bounced fill flash over my left shoulder and 90 degrees across



I will be using this in my flash wedding photography along with other tips from Neil's book, more to come.....

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