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FORUMS Photography Talk by Genre People Talk 
Thread started 26 Oct 2009 (Monday) 13:16
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how did he achieve this?

 
Burton8787
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Oct 26, 2009 13:16 |  #1

http://www.flickr.com …wlphotography/4​005423656/ (external link)

i was rolling threw flickr and i saw this it says stack nd filters? what are they and how many do i need to achieve this?


thanks guys


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chopperdave
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Oct 26, 2009 13:21 |  #2

ND (neutral density filter yeah?) filters are just filters to make less light come into the lens. So he did that to allow him to use a larger aperture for the shallow depth of field.

the more important stuff is the "Beauty dish above camera, sun behind to the right. Triggered with PW's. "


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Pete
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Oct 26, 2009 13:22 |  #3

Seems to be a bit contrived.

He implies in his use of ND filters that he needed them to slow down the shutter speed (if you shoot wide open in bright conditions, it's possible to run into the max shutter speed. But then again, the shutter speed here was 1/160

What I have trouble understanding is why he chose ISO 200 (bringing it down to 100 would halve his shutter speed) and why he used so much lighting.

I can understand why someone would use ND filters to slow the shutter speed for waterfalls, etc, but not for this application.


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Burton8787
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Oct 26, 2009 13:23 |  #4

i have the ab800 and want to achive a low f stop...this will help i think. copperdave to the rescue


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JasonL
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Oct 26, 2009 15:20 |  #5

Hi Burton8787,

Chopperdave is spot on. I used 2 ND filters, specifically ND4 and ND8 filters. My flash sync speed (1/200th sec) is the limiting factor, so in order to compensate, I have to increase my flash power and cut out as much ambient light as possible.

Pete, I chose ISO 200 so I wouldn't have to work my flash as hard and get decent recycle speeds.

I really enjoy the look of shallow DOF with strobes. Some more examples here:

IMAGE: http://farm4.static.flickr.com/3336/3256855545_843227a270.jpg
IMAGE: http://farm4.static.flickr.com/3658/3472055197_c2503a6ba8.jpg
IMAGE: http://farm4.static.flickr.com/3364/3256854157_f8d6fbe7c7.jpg
IMAGE: http://farm4.static.flickr.com/3309/3472861618_95a9e6b820.jpg
IMAGE: http://farm4.static.flickr.com/3454/3318312952_1fb152ba74.jpg
IMAGE: http://farm4.static.flickr.com/3552/3669000949_2b3d4e06de.jpg
IMAGE: http://farm4.static.flickr.com/3330/3657334737_6ecde33cb6.jpg
IMAGE: http://farm4.static.flickr.com/3407/3658126868_4b0c0364ca.jpg
IMAGE LINK: http://www.flickr.com/​photos/jwlphotography/  (external link)



  
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chopperdave
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Oct 26, 2009 15:22 |  #6

great shots. wow.


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E-K
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Oct 26, 2009 15:33 |  #7

JasonL wrote in post #8898771 (external link)
Pete, I chose ISO 200 so I wouldn't have to work my flash as hard and get decent recycle speeds.

Nice photos :). I don't quite follow your logic here though. If you go from ISO 100 to ISO 200 that means you need to add a 1 stop equivalent ND filter which is going to block the light from your flash and make it work just as hard no?

e-k




  
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tfizzle
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Oct 28, 2009 15:51 |  #8

he added the ND filter to get: Shutterspeed down to match the aperture he wanted to get a sync speed.

So without the ND filters he would be shooting above sync speed for the flash. Achieving DOF but not the ability to light his subject with a sun to the back.

If you stack on the ND filters that cuts down the ambient. Then he can shoot a wide aperture but it will STILL cast a shadow on the shadow without a flash. He then dials in his strobe.

If he shoots 1/2 power at ISO 100 he can essentially cut that to 1/4 with ISO 200 which helps his recharge rate for the strobe. Going up in ISO allows you to drop the strobe down to faster recycling because of the ISO compensation.

I guess you could take 1 stop out of the ND filters but I would suspect it's easier doing it the way it's set up.

He says he uses an ND4 and ND8. ND4=2 stops. nd8=3 stops. It's sorta hard to get 1 stop when your starting block is 2 stops to begin with. That means he has to make up the difference in the stop with ISO 200 which makes his flash work half has hard (depending on placement) as compared to ISO 100.

Hope that answers it.




  
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E-K
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Oct 28, 2009 21:10 |  #9

No not really :)

If he had said that all he had with him was an ND4 and ND8, and at the given aperture and max sync speed, ISO 200 gave him the appropriate exposure for the background, then that would follow.

Shooting at ISO 200 with an ND4 and ND8 versus shooting at ISO 100 with an ND2 and ND8 would make the flash work the same amount.

Use of NDs makes sense, it was just the one statement seemed a little odd.

e-k




  
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spikeystitch
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Oct 29, 2009 20:49 |  #10

I'm also a huge fan on DOF + strobe shots. mm. My most recent flickr photo is this idea without the ND filters.


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Svetlana
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Nov 03, 2009 13:15 |  #11

wow amazing photos!!!!!!!!


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ash.m
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Nov 03, 2009 17:55 |  #12

I love the effect as well. #6 in Jason's reply looks a litte odd though - as if extra blur has been added in PP, with the girls' lower halves being blurred, but their faces sharper. In the background the trees in the garden seem to suffer similarly.

Ash


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Chairman7w
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Nov 04, 2009 08:58 |  #13

Yeah, I think there's a little of that goin' on too, but they're still amazing shots. Great work!




  
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Lunajen
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Nov 04, 2009 09:04 |  #14

Gorgeous shots!!!


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JasonL
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Nov 04, 2009 09:36 |  #15

E-K wrote in post #8914737 (external link)
No not really :)

If he had said that all he had with him was an ND4 and ND8, and at the given aperture and max sync speed, ISO 200 gave him the appropriate exposure for the background, then that would follow.

Shooting at ISO 200 with an ND4 and ND8 versus shooting at ISO 100 with an ND2 and ND8 would make the flash work the same amount.

Use of NDs makes sense, it was just the one statement seemed a little odd.

e-k

Sorry for the confusion, but yeah, I don't have an ND2 filter to compensate exactly.

ash.m wrote in post #8949406 (external link)
I love the effect as well. #6 in Jason's reply looks a litte odd though - as if extra blur has been added in PP, with the girls' lower halves being blurred, but their faces sharper. In the background the trees in the garden seem to suffer similarly.

Ash

I used a tilt-shift lens for that shot, the blurring is caused by the tilt function.

Thank you all for the kind words.




  
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how did he achieve this?
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