[LargeFormat] Re: rainbows, was R O Y G B I V

[Vincent Dobson]

Good advice Dave.

Vince Dobson
Visions In Nature
www.VisionsInNature.com

:>-----Original Message-----
:>From: largeformat-admin@f32.net [mailto:largeformat-admin@f32.net]On
:>Behalf Of Dave Mueller
:>Sent: Friday, December 12, 2003 8:51 AM
:>To: largeformat@f32.net
:>Subject: Re: [LargeFormat] Re: rainbows, was R O Y G B I V
:>
:>
:>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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:>>
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