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Diffuser vs No Diffuser


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#1 echeng

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Posted 14 June 2005 - 08:19 PM

Hey, guys. I thought it would be cool to post photo comparisons of shots with and without diffusers. Here's my first comparison, taken today on the wreck of the Shakem here in Grenada:

No Diffuser:
Posted Image

Diffuser:
Posted Image

Taken with 1Ds Mk2, Tokina 17mm lens, dual Ikelite DS-125 strobes, positioned maybe 16" out on each side, slightly behind port and angled out a bit.
eric cheng
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#2 acroporas

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Posted 14 June 2005 - 11:05 PM

Wow, very noticable. Is the shot with diffusers the same strobe power as the one without, or did you increase strobe power to compensate for the diffusers.
William

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#3 anthp

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Posted 14 June 2005 - 11:42 PM

Edges of the flash "circle" are much less obvious with the diffusers on. I'd be very interested to hear an answer to William's question too.
Anthony Plummer
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#4 echeng

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Posted 15 June 2005 - 04:44 AM

Same strobe power -- you can see that there is less light in the center of the flash circle, with diffusers on.
eric cheng
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#5 kdietz

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Posted 15 June 2005 - 05:14 AM

The advertised 1 stop loss with the diffusers looks accurate.....I'd be interested in the same shot with the strobe turned up 1 stop....so effective light output is the same and we could then see the effect on coverage, edges, etc.

Karl
Karl Dietz...Nikon D200...Ikelite iTTL housing...10.5mm...15mm FE...12-24mm...17-35mm...60mm micro...105mm micro...dual DS-200's
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#6 MikeVeitch

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Posted 15 June 2005 - 11:46 PM

Karl, your wish is my command. All straight low jpegs from camera, just resized.


Can't really see the difference in spread, just the exposure and hotspots.
Strobes are dual S&S YS 120s on full power, D70, shutter at 1/60, ISO 200

I am using 14 inch arms and they were all the way out with strobes angled slightly out as it was murky, hence the lovely water colour. Lens was 12-24 set at 14mm and i was probably 3 or 4 feet from the coral head. I didn't have a wall handy underwater, and the mantas wouldn't sit still so you get this coral head instead...

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#7 MikeVeitch

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Posted 15 June 2005 - 11:53 PM

and the other two

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#8 kdietz

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Posted 16 June 2005 - 06:19 AM

Thanks Mike.....I agree that the only difference is brightness....can't tell about spread or quality of light....maybe another subject will show more?.....in the meantime, I'm going to continue using my diffusers :P ;)

Karl
Karl Dietz...Nikon D200...Ikelite iTTL housing...10.5mm...15mm FE...12-24mm...17-35mm...60mm micro...105mm micro...dual DS-200's
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