Dedo and flash.

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paul_sk

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Hello

I've got a question about Dedo dp400 projector. Would be grateful for any help...

Basically I'm considering using the dp400 on one of my photoshoots to create light effects by using gobos. It is important for me to get the shapes created by the light with no color fringing or halation. I have never worked with these lights before but heard they do the job.

As it will be my first time shooting with these lights I'm concern how much light I'll be able to get from them. Could anyone give me a guess idea what I might be able to get if I shoot with ISO 200, shutter speed around T30 and the distance from the projector to the model 2-3m.

Also I want to mix these lights with flash (profoto). Do you know what the color temperature of Dedo? Do I need to correct it?

Paul
 
Paul,

You've asked a very similar question on a lot of other forums another forum and been given very good answers by a physicist as well as by me and others on one of them.

You'll probably need to talk to your supplier for more specific info on output, but as a very rough guide, all things being equal, HMI will output about x10 (in real terms) per watt as halogen. This is based on my own testing of HMI lighting -v- halogen, I haven't tested with a focussing spot attachment and I haven't tested with Dedo as a specific brand.

So, a 100W HMI might give you the equivalent of about 1000W of halogen, which at T30 will equate to around 1/90th of the output of a 1000J flash, or in other words the approximate output of a 11 Joule flash. When I use my Elinchrom focussing spot I normally use it with something like 1000 - 2400 Joules of power. Focussing spots eat A LOT of power.

Halation - I've already told you, spray the gobos matt black, it helps.
Colour fringing - make sure that the gobos are held perfectly flat.
Colour temperature - theoretically the same, but they tend towards green after around 500 hours of use, so you may or may not need to gel.
 
Hi Garry

Thanks for the replyes and yes I did ask this q on a few other forums. I'm a bit in a rush with this particular set-up.

I'm going to test your suggestions (black gobos) tomorrow

Thanks again Garry
 
Over the past few years we have developed a great relationship with a local jeweller, we give them the photos we take in exchange for the loan of some exquisite pieces. For this trade, we had the opportunity to shoot a set of sapphire pieces, including the ring we will shoot for this lesson.
Because this item is made of platinum, we felt a dark background would be a good choice to set off the subject and add some drama in the form of contrast.While on a trip to the local garden shop, I found some stepping stones that looked very interesting. Although we did not need them at home, they were so cool I had to get a few. When this assignment to shoot a new jewellery lesson came along, these stones found their purpose.The black speckled finish on the stepping stone offers the contrast we wanted to set off the ring. As we mentioned, looking at the subject from an unusual angle will add more interest to the shot, so we decided to set the stone on end and placed the ring on top.
 
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