Naked Science Forum

On the Lighter Side => Science Experiments => Topic started by: buddhaists on 27/09/2014 02:02:39

Title: create circular rainbow and duuble rainbow just with garden sprays ?
Post by: buddhaists on 27/09/2014 02:02:39

Dear:


1. how  to  create circular rainbow just  with  garden sprays ?

( create  one picture  of  complete circular rainbow  without help of technology)


2. how  to  create duuble rainbow just  with  garden sprays ?

thank  you  for sugggestions! [O8)]

Title: Re: create circular rainbow and duuble rainbow just with garden sprays ?
Post by: RD on 27/09/2014 03:14:00

Quote from: buddhaists on 27/09/2014 02:02:39

1. how  to  create circular rainbow just  with  garden sprays ?

Apparently do-able ...

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http://www.atoptics.co.uk/fz303.htm

[His legs are preventing it from being a complete circle].

Photographing it will require either an ultra-wide angle lens (~80^o diagonal field-of-view) , or rapid-fire multi-exposure digitally-stitched together "montage", (which was what was done above) .

Title: Re: create circular rainbow and duuble rainbow just with garden sprays ?
Post by: buddhaists on 27/09/2014 03:48:54

Wonderful !

but best solution is without help of technology [:-\]

And a complete circular is required

Is there solution of no technology and perfect circular one

Title: Re: create circular rainbow and duuble rainbow just with garden sprays ?
Post by: RD on 27/09/2014 05:47:10

Quote from: buddhaists on 27/09/2014 03:48:54

but best solution is without help of technology [:-\]

Is there solution of no technology and perfect circular one

The diameter of a circular rainbow ring always subtends (http://www.mathopenref.com/subtend.html) the viewer's eye at at an angle of 42^o  (http://en.wikipedia.org/wiki/Rainbow#Overview): moving back does not make the rainbow appear smaller.

So to photograph it all-at-once you need a lens with a horizontal and vertical angles of view of at least 42^o , which is ultra-wideangle , which can be expen$ive.

Digitally stitching images together taken with a regular lens is a cheaper option.

Title: Re: create circular rainbow and duuble rainbow just with garden sprays ?
Post by: RD on 10/10/2014 23:37:00

(https://s1.yimg.com/bt/api/res/1.2/eLFD25o_LZrm2rU1o8sFmQ--/YXBwaWQ9eW5ld3M7Zmk9aW5zZXQ7aD0xMDI0O3E9Nzk7dz0xNTM2/http://l.yimg.com/os/publish-images/news/2014-10-10/d59fca20-508c-11e4-90c3-9113a2f235d6_CATERS_Round_Rainbow_In_The_Sky_01.jpg)

https://uk.news.yahoo.com/lightbox/full-circle-rainbow-photo-1412953010455.html

Title: Re: create circular rainbow and duuble rainbow just with garden sprays ?
Post by: buddhaists on 15/11/2014 05:56:14

How to make brilliant and clear circular rainbow just with garden spray bottle?


to solve this problem :

first we should consider what kind of factors influence  the clearness  and  quality of rainbow

when we make circular rainbow with spray?

can someone share what kind of factors influence  the clearness  and  quality of rainbow?

thanks!!