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Posted by Toby on 07/04/06 04:39
"PTravel" <ptravel@travelersvideo.com> wrote in message
news:Dufqg.164910$F_3.101080@newssvr29.news.prodigy.net...
>
> "Bill Farnsworth" <bill.farnsworth@verizon.net> wrote in message
> news:r7fqg.212$nG2.95@trnddc05...
>>
>> "Richard Crowley" <rcrowley@xpr7t.net> wrote
>>> "Bill Farnsworth" wrote ...
>>>> In some areas streetlights on minor roads, parking lots and pedestrian
>>>> walkways are now being converted over to full spectrum 3200 LEDs.
>>>
>>> The astronomers must hate that. So much for the International Dark Sky
>>> Association
>>> http://www.darksky.org/
>>> They loved sodium vapor, et.al. because the terrestrial
>>> light pollution could be so easily filtered out.
>>
>> First off, as I and several others have said, Paul's video looks damn
>> fine as it.
>>
>> But I had a bit more of a "think" on this one.
>> What's wrong with it.
>> Nothing. The street lights came out just as we see them. A bit orange.
>> And if there are any Mercury Vaps then they would be green........ just
>> as we see them.
>> However, what is not being seen as natural (natural for Sodium Vap light,
>> that is) is the sky and shadows are not black. They are slightly orange.
>> IRL we see the orange (or green) light. But.......... for all intents and
>> purposes, we also see the night sky as black.
>>
>> Now, throw away the black balance issue for a bit and think about
>> this....
>>
>> When you are shooting under street lights or with street lights in the
>> shot, you will have a lens flare issue. Especially a dusty lens or
>> filter. And that flare well lighten the image a bit off to the range of
>> the color temp of the offending light(s).
>>
>> With me so far?
>>
>> So along with everything else that has been suggested make sure the lens
>> and filters are dust free.
>> Use a larger lens shade.
>> And ......... toss a polarizer on that puppy and dial it in a wee bit to
>> see what you get.
>>
>> Bill F.
>> www.billfarnsworthvideo.com
>
> Ooooh --- fantastic point! In this instance, the lens was clean, but I
> usually don't use a lens shade at night -- I guess I should. It also
> never occurred to me to use a polarizer at night -- another great idea!
>
> The lens shade would have been impossible in this instance because I was
> using the rain cape on my camera, and it won't accomodate a lens shade.
> Also, it was misty and rainy, so there was a lot of light reflection from
> the sky.
A polarizer isn't going to do you any good at night, except to cut your
usable light by about 1.5 stops. You would need a single point source of
light for a pol to be effective, at 90 degrees from the source.
Toby
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