[LargeFormat] Re: rainbows, was R O Y G B I V
Dave Mueller
largeformat@f32.net
Fri Dec 12 08:55:31 2003
A polarizer will help a great deal. In fact, it will sometimes allow
you to see a rainbow that you normally wouldn't see. We have a fountain
in Pittsburgh, you can get a rainbow in the mist almost anytime the Sun
is behind the fountain simply by using a polarizer. The colors should
not shift in a rainbow, since you're actually photographing the light
itself, not a reflection from some material like the bluebells. A lot
of flowers shift colors because of UV and IR reflections that the film
does (or doesn't) record. A slow shutter speed will allow a more
"solid" rainbow since it will allow more empty space to be filled in by
water droplets (same concept as using a slow shutter speed for
waterfalls etc).
Dave
philip lambert wrote:
>I probably used an exposure of about 1/250 for the shot of the rainbow that
>disappointed. The rainbow lasted five minutes, maybe less. I can't see how
>a shorter shutter speed would achieve an improvement. The problem probably
>lies in the way the film emulsion sees the light which is different to the
>way the eye sees it. I see bluebells as blue but all too often the photo
>shows a reddish blue and it would take some work on the computer to fix it.
>Maybe a digital camera would be capable of a realistic rendering in
>experienced hands. Philip
>----- Original Message -----
>From: "john frost" <johnfrost@sprintmail.com>
>To: <largeformat@f32.net>
>Sent: Friday, December 12, 2003 12:45 AM
>Subject: Re: [LargeFormat] Re: rainbows, was R O Y G B I V
>
>
>
>
>>As with cars, people, and aircraft, their motion through the frame may
>>be fast enough to NOT be recorded, if using a slow shutter speed. If you
>>want to capture the reflection (or refraction)of a drop (or molecule) of
>>water, a faster shutter speed is needed.
>>
>>john (:>)))
>>
>>Alan Davenport wrote:
>>
>>
>>>At 11:47 AM 12/11/2003, you wrote:
>>>
>>>
>>>
>>>>A slow shutter speed allows the water molecules to run away (turn),
>>>>thereby loosing their contribution to the color.
>>>>
>>>>
>>>Are you serious? Hmmm. My understanding of the physics of rainbows, is
>>>that the bow is produced by internal reflections and refraction through
>>>water droplets, i.e., rain. I doubt if the fastest shutter could keep
>>>up with motion at the molecular level...
>>>
>>>
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