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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 10 Jan 2017 (Tuesday) 19:21
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Studio light comparison chart

 
bobbyz
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Jan 19, 2017 10:21 |  #46

Wilt wrote in post #18248364 (external link)
Sorry, I misinterpreted the intent behind your previous post.

As for your question (in blue)...
Let us imagine that we measure with two flash units of exactly equal power but tested in two places...1/3 difference amounts to perhaps f/14 on the minus side or f/17.6 on the plus side.
So, due to lack of standardization of testing, Test A comes out with GN140 while Test B comes out with GN176. As a result, if a reader of the chart is trying to 'overpower the sun' (as so many want to do during outdoor portraiture), shooting at ISO 100 from 10' away, the reader is led to believe that one is too weak to even equal the sun while the other exceeds it by a small amount, so they choose the unit tested in Test B
...yet the one at Test A has the exact same amount of power as the one in Test B! Misleading result of testing in two locations, two identical-powered flash units!

Wilt,

I don't know if you shoot outside in the sun but all I would say when shooting outside and trying to match/beat ambient, 1/3 difference with a typical 500-600ws doesn't make much difference. Yes I am over simplifying things but sometimes that is what you need. Any ways, I will let you guys carry on.


5dmk3, 35L, 85L II, 300mm f2.8 IS I, 400mm f5.6
Fuji XT-1, 14mm f2.8, 23mm f1.4, 35mm f1.4, 56mm f1.2, 90mm f2, 50-140mm f2.8

  
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Wilt
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Post edited over 2 years ago by Wilt. (4 edits in all)
     
Jan 19, 2017 10:46 |  #47

bobbyz wrote in post #18249287 (external link)
Wilt,

I don't know if you shoot outside in the sun but all I would say when shooting outside and trying to match/beat ambient, 1/3 difference with a typical 500-600ws doesn't make much difference. Yes I am over simplifying things but sometimes that is what you need. Any ways, I will let you guys carry on.

Bobby, yes well aware that 1/3 EV is hardly anything at all, scarely noticeable difference. I have done posts for POTN showing the balance of ambient to flash in 25% increments, to show that meters with 10% incremental ambient:flash displays are needlessly precise

IMAGE: http://i69.photobucket.com/albums/i63/wiltonw/Principles/flash%20mix_zpsz2dzioee.jpg

During that test, I provided five shots at ISO 1600:


  1. Ambient-only, as a control shot: 1/160 f/3.2
  2. Flash 25% +ambient 75%: 1/25 f/5
  3. Flash 50% + ambiemt 50%: 1/40 f/4.5
  4. Flash 75% + ambient 25%: 1/60 f/4
  5. Flash 100% + ambient 0%: 1/160 f/4


and the difference of #2 vs. #3 is difficult to see...a 25% difference! In years of experience in wedding coverage, I know that my result on film was that fill flash intensity at -1EV (relative to ambient) gave me a bit higher contrast than I wanted, and -0.33EV fill flash intensity gave me not enough contrast (shot illumination would be too 'supplemental illumination' appearance for me.

In the discussion which you quoted, I was well aware that 1/3 EV is not much at all, but the major point was that even when the errors go under and over by 1/3 EV (a small amount of error), folks can be mislead to bad conclusions and select Unit A over Unit B, although both are 'the same' in power! Therefore it is truly necessary to try to have 'equal' in testing, rather than to allow for subtle deviations in method to introduce errors.

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Canon dSLR system, Olympus OM 35mm system, Bronica ETRSi 645 system, Horseman LS 4x5 system, Metz flashes, Dynalite studio lighting, and too many accessories to mention

  
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Wilt
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Post edited 2 months ago by Wilt. (2 edits in all)
     
Nov 22, 2018 15:08 |  #48

F2Bthere wrote in post #18249041 (external link)
Or maybe Chimera could put each unit in the same model of softbox and do a side by side.... ;)

But seriously, putting all the specs in a single table is a help. Sure, you could look it all up but a single table makes it quick. Convert it to your database or spreadsheet of choice and you could create a short list of units to compare which meet your criteria.

I would love to see some side by side tests. Even if we can't get an objective single test, a side by side test might just hit a person's needs if you got really lucky and the relationship between two people's tests might help. Perfect test? No. But better than nothing and, as data builds, it will become easier to sort.

A few decades ago, Chimera did just that!!! They took studio flash power packs rated by the manufacturer at 1000 w-s (or so), then they powered them into the same manufacturer's standard head, and took light readings (using identical flashmeter) from each one. I recall that Dynalite M1000 would get about +1EV more light out than a 1000 w-s Speedotron, for example.


You need to give me OK to edit your image and repost! Keep POTN alive and well with member support https://photography-on-the.net/forum/donate.p​hp
Canon dSLR system, Olympus OM 35mm system, Bronica ETRSi 645 system, Horseman LS 4x5 system, Metz flashes, Dynalite studio lighting, and too many accessories to mention

  
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Angmo
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Post edited 2 months ago by Angmo. (3 edits in all)
     
Nov 22, 2018 18:09 |  #49

KatManDEW wrote in post #18240459 (external link)
The studio strobe options are daunting to me. Has anyone ever seen a comparison chart? Would anyone be interested in contributing if I began compiling such a chart?

Hensel has hard light, soft light and special light references. Great for any modifier with similar dimensions.

https://hensel.eu …comparison_soft​_light.pdf (external link)


Nikons, Rolleiflexes, Elinchroms, Billinghams

  
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Studio light comparison chart
FORUMS General Gear Talk Flash and Studio Lighting 
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x 1600
y 1600

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