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Author Topic: Willow Pond  (Read 372 times)

bobfriedman

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Willow Pond
« on: March 08, 2020, 07:59:00 am »

Nikon D800 ,Nikkor 20mm f/3.5 Nikkor-UD Auto ,RG715
1/400s f/5.6 at 20.0mm iso125
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Bob Friedman
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francois

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Re: Willow Pond
« Reply #1 on: March 08, 2020, 04:03:23 pm »

Surreal and spectacular. I like the shapes of the clouds.

By the way, is it the moon in the sky?
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Francois

bobfriedman

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Re: Willow Pond
« Reply #2 on: March 08, 2020, 05:02:11 pm »

By the way, is it the moon in the sky?

jet airplane
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Bob Friedman
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kers

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Re: Willow Pond
« Reply #3 on: March 08, 2020, 06:06:49 pm »

beautiful!  here in the netherlands i only saw this kind of snowlandscape once.
You remind me i also have this lens :) ... a later 1985 type.
Do i understand you use a filter that cuts at 715nmeter - so only Red and short IR passes through?
https://www.itos.de/en/schott-optical-filters/long-pass/rg665-rg695-rg715/

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Pieter Kers
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bobfriedman

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Re: Willow Pond
« Reply #4 on: March 08, 2020, 06:15:12 pm »

.
Do i understand you use a filter that cuts at 715nmeter - so only Red and short IR passes through?

correct, the camera has been modified and the UV/IR cut filter has been replaced with an RG715 long pass which passes some red and infrared up to around 1000 nm or so. I swapped the red and blue channels in photoshop giving the illusion of a blue sky. essentially this is an intensity map of reflective infrared so that material in the scene that is highly infrared reflective is white and materials infrared absorbing are black. in addition to absorption in water there is less penetration so the reflections here are more pronounced.

the snow-like effect is illusory and so is the false color blue sky.   the phenomenology is genuinely reflective infrared.
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Bob Friedman
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Paulo Bizarro

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Re: Willow Pond
« Reply #5 on: March 09, 2020, 09:01:22 am »

Good result.

Eric Myrvaagnes

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Re: Willow Pond
« Reply #6 on: March 10, 2020, 11:15:02 am »

I like this a lot.
Your explanation is a bug help, too, as I couldn't believe all the "snow" this winter.
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-Eric Myrvaagnes (visit my website: http://myrvaagnes.com)
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