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What's the diference beetween this lights?

tungstein

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#1 Márcio Heleno Soares

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Posted 25 October 2014 - 08:36 AM

I'd like to know what's the diference between a fresnel 1000w and this kind of light with a tungstein lamp of 1000w:
main_22.jpg


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#2 Mark Dunn

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Posted 25 October 2014 - 08:44 AM

A fresnel can be focussed. The open-face floodlight can't.

The barn doors will have a very limited effect. It's basically a security light.


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#3 Márcio Heleno Soares

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Posted 25 October 2014 - 09:01 AM

Thanks for ur answer Mark.  I did a search for comparison for the diference using lenses and lights without lenses. I found this:

IMG_1076FRESNEL_only_and_reflector_leftB

IMG_1022trim_Floodlight_tall_foil_reflec

 

I can't believe this shadows it's just result of the use of lenses. Is it? I am preparing to buy a fresnel kit to pratice. 


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#4 David Mullen ASC

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Posted 25 October 2014 - 10:10 AM

The barn doors on an open faced unit like that are mainly just to reduce side spill and give you something to clip a gel to.  Useful for bouncing or going through a diffusion frame, though even with those barn doors you may get side spill that needs to be flagged or blackwrapped.

 

A fresnel lens makes the beam more focused and even from edge to edge so that a barn door actually can be used to create a soft cut on the light.  The light from the fresnel creates a cleaner shadow.  It also allows a spot to flood design for the unit.  So if you are doing much direct hard lighting, then fresnels are useful. See:

 

http://en.wikipedia....ki/Fresnel_lens


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#5 Phil Rhodes

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Posted 25 October 2014 - 10:35 AM

That said I've had good luck with security lights!

 

There's nothing wrong with the light, it just goes everywhere. Large flags required.

 

And they're practically disposable, they're so cheap.

 

P


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#6 Márcio Heleno Soares

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Posted 25 October 2014 - 10:40 AM

I understand! Thanks! 


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#7 Vadim Joy

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Posted 05 November 2014 - 03:18 PM

If you need something to start I'd recommend redheads. Also come with barn doors but as been said they are useful only to put gels and diffusion on. They are relatively cheap and powerful tungsten lights. Usually come 800w as a kit bulb but you can change it for something like 250w, which can be used for backlight for example.

I'll be using those to light my first feature. I did some tests and from what I can see they are useful lights. Although get hot, very hot.

 

The main difference between those and the ones you showed (security lamp) on picture is that redheads have even reflectors inside, which gives you a bit more sharper shadow. All those little bubbles you see around the bulb will give you nothing more but trouble. 


Edited by Vadim Joy, 05 November 2014 - 03:22 PM.

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#8 Bill DiPietra

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Posted 05 November 2014 - 04:47 PM

If you can afford fresnels, get fresnels.


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#9 Gregg MacPherson

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Posted 05 November 2014 - 05:22 PM

Hey Bill,  this reminds me of another conversation.  We could have a poll,  such as...."by default,  what are the first two lights that someone starting out should aquire?".   Does this forum do polls?


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#10 Bill DiPietra

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Posted 05 November 2014 - 07:11 PM

Hey Bill,  this reminds me of another conversation.  We could have a poll,  such as...."by default,  what are the first two lights that someone starting out should aquire?".   Does this forum do polls?

 

LOL...not really sure.  I think an earlier version of it may have, but I don't know if this one does. 

 

Tim?...


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