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Re: [OM] Be careful where you sit...

Subject: Re: [OM] Be careful where you sit...
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Sun, 04 Jan 2009 12:26:28 -0500
Thanks, but you didn't answer my real question which is... why?

C.H.Ling wrote:
> Light source will not reduce intensity with distance if it is the object you 
> are shooting. But the object illuminating by the light source will, when the 
> distance between light source and object increases, the intensity drops.
> 
> You have mixed up the light source and the object, if the sun is the object, 
> the intensity will not drop with distance too.
> 
> C.H.Ling
> 
> ----- Original Message ----- 
> From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
> 
>> This discussion of light sources vs subjects has made me realize that I
>> don't understand the physics of the situation at all.  I can readily
>> understand why a point source like the sun has its intensity drop off as
>> the square of the distance.  A fixed quantity of light is expanding to
>> fill an ever larger virtual sphere whose surface area is increasing
>> according to the square of the radius (4*pi*r^2).  What I don't
>> understand is why, once the light has struck and reflected off the
>> subject, why the subject is not treated as the "light source" for the
>> reflected light that's emanating from it in the same sense as the sun is
>> a light source.
>>
>> Chuck Norcutt
>>
>>
>> C.H.Ling wrote:
>>> I mean you stack two RAW developments of the same image.
>>>
>>> C.H.Ling
>>>
>>> ----- Original Message ----- 
>>> From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
>>>
>>>> Sound fine for a static subject with the camera on a tripod.  :-)
>>>>
>>>> Chuck Norcutt
>>>>
>>>> C.H.Ling wrote:
>>>>> If you need to reduce the overall exposure to avoid the faces from
>>>>> burn-out
>>>>> that means you have over exposed your images. The background of the 
>>>>> scene
>>>>> could be dark but your subject is the people so you should expose for 
>>>>> it.
>>>>> To
>>>>> bring some shadow details out you may max two different developed 
>>>>> images,
>>>>> one exposed for the people and the other slightly increase the exposure 
>>>>> a
>>>>> little bit.
>>>>>
>>>>> C.H.Ling
>>>>>
>>>>> ----- Original Message ----- 
>>>>> From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
>>>>>
>>>>>> Good thought but I think my chance of talking to the stage manager is
>>>>>> about zero.  It raises an interesting question in my mind about how 
>>>>>> the
>>>>>> DVD turned out.  This event is always recorded on video and a DVD is
>>>>>> made available for sale after the event.  My son doesn't buy it 
>>>>>> because
>>>>>> it's too expensive and my granddaughter is only on stage for about 
>>>>>> 5-10
>>>>>> minutes out of a 2 hour long production.  I just wonder how the video
>>>>>> cameras (with long lenses shooting from the back of the auditorium) 
>>>>>> fare
>>>>>> under the same lighting conditions.  Actually, since they do sell the
>>>>>> DVD, I have been surprised for the past two years that they have never
>>>>>> objected to me coming in with the 5D and a big lens.
>>>>>>
>>>>>> After adjusting the color temperature for most shots into the 
>>>>>> 2800-3500K
>>>>>> range the overly bright red was considerably subdued but still too
>>>>>> bright to be completely recovered with just the "recovery" slider in
>>>>>> ACR.  Most of it could be handled by dropping the overall exposure 
>>>>>> along
>>>>>> with the recovery slider but then the overall exposure was much too
>>>>>> dark.
>>>>>>
>>>>>> The 5D treats me well most of the time so I think I'll keep it despite
>>>>>> its shortcomings.  :-)
>>>>>>
>>>>>> Chuck Norcutt
>>>>>>
>>>>>>
>>>>>> C.H.Ling wrote:
>>>>>>> May be you can talk to the stage manager, @ ISO3200 F2.8 1/60s is 
>>>>>>> just
>>>>>>> too
>>>>>>> dark for enjoying the performance! The Chinese Opera I just shot was
>>>>>>> having
>>>>>>> a minimum light level of ISO400 F4 1/60s, four stops brighter than
>>>>>>> yours.
>>>>>>>
>>>>>>> For the difference in RGB channels, did you set the WB to 2800-3200K?
>>>>>>> Some
>>>>>>> lower power stage light may be just too warm. Finally, if everything
>>>>>>> just
>>>>>>> didn't work out, send me your 5D and purchase a 5D Mark II, which
>>>>>>> should
>>>>>>> give you extra one or two stops to work with ;-)
>>>>>>>
>>>>>>> C.H.Ling
>>>> -- 
>>>> _________________________________________________________________
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>>>> Themed Olympus Photo Exhibition: http://www.tope.nl/
>>>>
>>>>
>> -- 
>> _________________________________________________________________
>> Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
>> Archives: http://lists.thomasclausen.net/mailman/private/olympus/
>> Themed Olympus Photo Exhibition: http://www.tope.nl/
>>
>>
> 
-- 
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Themed Olympus Photo Exhibition: http://www.tope.nl/

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