Camera models and High Speed Sync

Hello,

I don't know if that's the correct group but if someone could help or
just send some links to another group that would be grateful. I am
working on digital image processing but I don't know a lot of things
about digital camera models and High Speed Sync. We want to buy some
equipment to do some indoors experiments in noise reduction and I
would like to ask if someone could suggest such cameras and sync
devices.

We would like to buy a digital camera that can capture few photos (let
say 8) one after the other as fast as possible. For each photo we have
to use a flash and therefore we need to synchronize the flash and each
picture. Is there such devise that can synchronize the camera and the
flash? (or a camera model that produces a signal every time the image
is going to be captured in order to trigger the flash). Also, I would
like to ask what type and model of flash is better for that case.
Instead of using one high speed flash can you use 8 different?

The camera resolution is not an issue since 1Mpixel is more than
enough. The minimum shutter speed could be 1/30 for each picture but
we are looking for something like 1/250 or even 1/1000.

Please, any suggestions for such a camera model and a Sync devise
would be really helpful. Thanks a lot in advance.

vasilis

In article .com,
"vasilis" wrote:

We would like to buy a digital camera that can capture few photos (let
say 8) one after the other as fast as possible. For each photo we have
to use a flash and therefore we need to synchronize the flash and each
picture. Is there such devise that can synchronize the camera and the
flash?

Vasilis-

How fast did you have in mind?

Actual shutter speed may not be a problem since the electronic flash
duration is quite short by comparison. As long as the camera-flash
combination is synchronized, and the flash is the main source of light,
it shouldn't matter.

Your problems will most likely be a) how fast can you fire the camera
for subsequent images, and b) how much time does it take for the flash
to recycle for the next shot. Offhand, I'd say you should be able to
capture one per second with a little effort.

If you had something like ten or more per second in mind, you are
looking for more specialized equipment. Perhaps a movie camera with an
ability to fire a flash for each frame. Try a web search for high-speed
photography, and see what comes up.

Fred

On Apr 2, 7:35 pm, Fred McKenzie wrote:
In article .com,

"vasilis" wrote:
We would like to buy a digital camera that can capture few photos (let
say 8) one after the other as fast as possible. For each photo we have
to use a flash and therefore we need to synchronize the flash and each
picture. Is there such devise that can synchronize the camera and the
flash?

Vasilis-

How fast did you have in mind?

Actual shutter speed may not be a problem since the electronic flash
duration is quite short by comparison. As long as the camera-flash
combination is synchronized, and the flash is the main source of light,
it shouldn't matter.

Your problems will most likely be a) how fast can you fire the camera
for subsequent images, and b) how much time does it take for the flash
to recycle for the next shot. Offhand, I'd say you should be able to
capture one per second with a little effort.

If you had something like ten or more per second in mind, you are
looking for more specialized equipment. Perhaps a movie camera with an
ability to fire a flash for each frame. Try a web search for high-speed
photography, and see what comes up.

Fred

Thanks Fred, thats what we were thinking and as you suggested
we are gonna use a video camera.

Thanks again and for the web search hint
vasilis

vasilis wrote:
Hello,

I don't know if that's the correct group but if someone could help or
just send some links to another group that would be grateful. I am
working on digital image processing but I don't know a lot of things
about digital camera models and High Speed Sync. We want to buy some
equipment to do some indoors experiments in noise reduction and I
would like to ask if someone could suggest such cameras and sync
devices.

We would like to buy a digital camera that can capture few photos (let
say 8) one after the other as fast as possible. For each photo we have
to use a flash and therefore we need to synchronize the flash and each
picture. Is there such devise that can synchronize the camera and the
flash? (or a camera model that produces a signal every time the image
is going to be captured in order to trigger the flash). Also, I would
like to ask what type and model of flash is better for that case.
Instead of using one high speed flash can you use 8 different?

The camera resolution is not an issue since 1Mpixel is more than
enough. The minimum shutter speed could be 1/30 for each picture but
we are looking for something like 1/250 or even 1/1000.

High Speed Sync is really very de-synchronized. It works by 'pulsing'
the flash in very small amounts as the shutter travels end to end during
the exposure. The flashing begins just prior to the front curtain run
and ends just after the rear curtain run. It is, from an energy point
of view, very, very inefficient.

HSS is offered by Minolta (now Sony) high end flashes and moast recent
bodies.
Canon and Nikon (probably Oly and Pentax too) you can get HSS as well
(under varying names).

In cameras like the Maxxum 9 you could achieve 1/12,000 s HSS flash.

1) the flash must be HSS.
2) the camera body must be HSS.

An other alternative is the Nikon D70 (and other Nikons) which offer
sensor based shuttering to achieve true sync speeds up to 1/500.

The Maxxum 5D, 7D and Sony A100 have HSS with the 3600 and 5600 HS
series flashes (and the re-badged Sony's).

Canon/Nikon have their own as well. (Pentax/Oly?)

Cheers,
Alan

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