Elinchrom 600/1200RX kit for fashion photography?

Milamug wrote in post #6873267
=Milamu'g;6873267]Unle​ss you're shooting high action sport (think race cars etc)the 1/1450 is gonna be more then sufficient. And this will go up when you lower the power not down.

That is incorrect! The flash duration increases as you decrease the power on a monolight such as the Elinchrom RX. Also, you don't need race cars - a simple jump and the subject's feet and hands are likely to move too fast to freeze at t0.5 of 1/1450 (which is likely to be around 1/500 at t0.1).

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Originally Posted by Milamu'g

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Rudi wrote in post #6873294
That is incorrect! The flash duration increases as you decrease the power on a monolight such as the Elinchrom RX. Also, you don't need race cars - a simple jump and the subject's feet and hands are likely to move too fast to freeze at t0.5 of 1/1450 (which is likely to be around 1/500 at t0.1).

Ok after some research I found we're both half wrong/half right. It just depends on your strobes. Some strobes control the output level by decreasing the flash duration, others by controlling the voltage stored in the main capacitor which will increase flash duration.
As far as the flash duration not being enough to stop action, you're right! I was thinking shutter speeds

Milamug wrote in post #6874135
=Milamu'g;6874135]Quot​e:
Originally Posted by Milamu'g

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Unless you're shooting high action sport (think race cars etc)the 1/1450 is gonna be more then sufficient. And this will go up when you lower the power not down.

Ok after some research I found we're both half wrong/half right. It just depends on your strobes. Some strobes control the output level by decreasing the flash duration, others by controlling the voltage stored in the main capacitor which will increase flash duration.
As far as the flash duration not being enough to stop action, you're right! I was thinking shutter speeds

I don't see how Rudi's half wrong, he was talking about a specific brand and model of monolights and got it exactly right.

As for the duration, I don't consider any of the strobes discussed as having a short enough duration to freeze action in extreme circumstances - the difference between the durations of the 600RX and 1200RX for example, is minor. Both are fast enough for portrait and fashion work, neither is fast enough for the crazy jumping/twirling shots that everyone seems to need to shoot. You'd need a MUCH shorter duration to get perfectly frozen action in those circumstances so there's no point fretting over a few hundredths of a second in t0.5 - just get the strobes with the power you need.

Hermes wrote in post #6875019
I don't see how Rudi's half wrong, he was talking about a specific brand and model of monolights and got it exactly right.

As for the duration, I don't consider any of the strobes discussed as having a short enough duration to freeze action in extreme circumstances - the difference between the durations of the 600RX and 1200RX for example, is minor. Both are fast enough for portrait and fashion work, neither is fast enough for the crazy jumping/twirling shots that everyone seems to need to shoot. You'd need a MUCH shorter duration to get perfectly frozen action in those circumstances so there's no point fretting over a few hundredths of a second in t0.5 - just get the strobes with the power you need.

Rudi was talking in general though and just used the Elinchrom RX as an example. I was merely pointing out that it just depends on the strobe and an Elinchrom RX is not a benchmark for any strobe.
Lighting will NEVER perfectly freeze action only shutter speed does that. The only way to perfectly freeze action with lighting is when you completely kill the ambient, and that's normally done with shutter speed.

Milamug wrote in post #6876310
=Milamu'g;6876310]
Lighting will NEVER perfectly freeze action only shutter speed does that.

Wrong again! Stopping a bullet in flight is done with strobes, NOT a super fast shutter speed. And I think you will find that most monolights work exactly as the Elinchrom RX strobes do - shortest flash duration at full power!

BTW, we were talking here about the Elinchrom RX strobes (check the subject line), and I specifically mentioned the Elinchrom RX strobe in my reply to yours. There was no half-right! One of us was right, and one of us was wrong.