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Photography Question 
Melissa  L. Zavadil
BetterPhoto Member Since: 2/26/2005
 

Rainbow Phenomena??? Explainations?


I was photographing this rainbow that was very close to me and I had this strange phenomena happen. When I was photographing the left hand side of the rainbow (too big to photograph the whole thing) I looked through the view finder with the camera horizontal and I could see the rainbow I took the photo and looked at the screen and it showed up just fine. I wanted a vertical shot so I tilted the camera vertically and majically the rainbow disappeared in both the view finder and the picture! Now... Moving to the right hand side of the rainbow ONLY the vertical shot would work NOT the horizontal. There had to be some prism effect here but does anyone know for sure what happened? Curious??? Thanks
Melissa


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6/12/2005 6:46:33 AM

 
John Rhodes
BetterPhoto Member Since: 2/24/2005
  Melissa, I don't have a clue. Maybe it's a left-eye right-eye thing. Naw---

I have enjoyed exploring your gallery on more than one occasion. You have great photos of your son. I love the little cowboys. Keep up the great work.

VR

John


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6/12/2005 6:55:37 AM

 
Melissa  L. Zavadil
BetterPhoto Member Since: 2/26/2005
  Thanks john! This has me soo curious I can't stop thinking about it! Has anyone else had this happen to them?


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6/12/2005 7:22:05 AM

 
Melissa  L. Zavadil
BetterPhoto Member Since: 2/26/2005
 
 
 
I am going to down load two of the photos so you can see the difference these were taken within less than a half second on one another and trust me the rainbow DID NOT change.


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6/12/2005 7:28:06 AM

 
Bob Cammarata
BetterPhoto Member Since: 7/17/2003
  Did you have a polarizing filter on your lens?
If so, you need to rotate it 1/4 turn when you flip the camera to get the same effect.
Without a filter,..I haven't a clue what could have caused this.


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6/12/2005 9:11:50 AM

 
Melissa  L. Zavadil
BetterPhoto Member Since: 2/26/2005
  I DID have a polarizing filter!! Is that it!! But why would it be different for the different sides of the rainbow?? Thanks!

And why do you have to rotate the filter 1/4th?


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6/12/2005 9:15:28 AM

 
Melissa  L. Zavadil
BetterPhoto Member Since: 2/26/2005
 
 
 
I'll download the other side of the rainbow.


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6/12/2005 9:23:00 AM

 
Melissa  L. Zavadil
BetterPhoto Member Since: 2/26/2005
 
 
 
I'll try that again...


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6/12/2005 9:39:12 AM

 
Melissa  L. Zavadil
BetterPhoto Member Since: 2/26/2005
 
 
 
I'll try that again...


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6/12/2005 9:39:38 AM

 
Bob Cammarata
BetterPhoto Member Since: 7/17/2003
  I don't know why the other side of the rainbow had an opposite effect. (We may have ask God this question.) :)

You have to rotate the filter to get the same effect due to the way the polarizing glass works. I'm not real sure why technically. (Where's Jon Close when we need him.)
I discovered that while wearing polarized suglasses and looking at water reflections.
(If you tilt your head to the left or right more surface glare is evident than if you were looking at the water straight on.)


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6/12/2005 9:50:56 AM

 
Melissa  L. Zavadil
BetterPhoto Member Since: 2/26/2005
  You mean to tell me that there is a one way up on the polarizing filter? I looked at mine and it seems to rotate pretty freely. I bought the original canon version that goes with the camera. It is a circular polorizar.


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6/12/2005 10:14:16 AM

 
John Rhodes
BetterPhoto Member Since: 2/24/2005
  Melissa, Bob is entirely correct. this was caused by the polarizing filter. As you know, you rotate the filter to give the desired results--which light rays are filtered and how much.

If you ever have this opportunity again, hold the camera normally (hor) and rotate the filter and I'll bet that you can block the rainbow or not affect the rainbow at all--depends on the orientation of the filter with respect to the direction of the light rays.

You rotated the camera 90 degrees, so you would have to rotate the filter the same ammount to compensate.

The direction of the light from one side of the rainbow is opposite from the direction from the other side; therefore you got the opposite affect.

Your filter did exactly what it was meant to do. Remember, you must rotate the filter to obtain the desired results everytime you shoot.

VR

John


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6/12/2005 11:59:34 AM

 
Melissa  L. Zavadil
BetterPhoto Member Since: 2/26/2005
  OM - Gosh you are right!! That has to be it! -- you mean to tell me that I was supposed to be rotating my filter not only on this but ALL my shots!! LOL Well John you just gave me a whole nother' tool to play with-my dear friend! :o) LOL


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6/12/2005 12:24:58 PM

 
Bob Cammarata
BetterPhoto Member Since: 7/17/2003
  This is true Melissa.
If you want to duplicate the effect of a horizontal composition when using a polarizer,...turn the filter 90 degrees..(1/4 turn) to compensate.


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6/12/2005 2:08:14 PM

 
Bob Cammarata
BetterPhoto Member Since: 7/17/2003
  p.s....On the second photo you posted, the right side of the 'bow, you may have turned the polarizing ring a little (inadvertently) while focusing and reversed the effect. (I guess we don't have to bother God for an answer.) :)


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6/12/2005 2:16:06 PM

 
Melissa  L. Zavadil
BetterPhoto Member Since: 2/26/2005
  I had absolutely NO IDEA! This is so amazing to me. I knew none of this! This has been so informative! Thanks Bob and John for figuring out this mystery for me! I am going to be rotating my filters a lot now! :o)


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6/12/2005 2:19:06 PM

 
Melissa  L. Zavadil
BetterPhoto Member Since: 2/26/2005
  I don't think that I inadvertently turned the ring, I used a fixed lens with an internal rotating mechanism. I kept going from one side of the rainbow to the other and doing the horizontal then the vertical watching the bow' disappear majically before my eyes. I even showed my husband this magic! I did this several several times back and forth with this over and over because I thought it was so strange each and every time with the same effect.


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6/12/2005 2:28:18 PM

 
Michelle Ross
BetterPhoto Member Since: 1/1/2004
  I had this similarily happen to me Melissa. . . and as John or someone mentioned the polarizer filter was my culprit. . . it was weird because as I rotated the filter the rainbow changed in it's vibrancy! The photos look great by the way . .we've had a ton of rain here and I keep thinking teh sun will peek through and give me a rainbow . . .but I think it's just doom and gloom!


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6/12/2005 2:51:50 PM

 
Melissa  L. Zavadil
BetterPhoto Member Since: 2/26/2005
  WOW! But, you knew to rotate the filter? How did you know? This is so silly but I NEVER knew that!

I am so glad that someone else has had this happen to them. I thought that I was experiancing some weird happening!! :o) I can't wait for another rainbow now because I want to play with the filter!! :o)


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6/12/2005 2:56:46 PM

 
Michelle Ross
BetterPhoto Member Since: 1/1/2004
  Well . . I had a photographer friend and relative tell me that you shoudl be able to see a "difference" in sky color when you rotate your filter and so it was really just trial and error that I even did it. . . I think the main reason was because when I took the camera down from my eye the rainbow was very fairly visible but when I put the camera up to take the picture it wasn't so I was getting confused as to why this was happening and just by luck rotated the filter LOL . . . So just FYI . . . if you are just shooting anything in general you can rotate the filter to change the appearance of the sky, etc. :-)


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6/12/2005 5:26:22 PM

 
Chip Blair   I had a similar mystery about 35 years ago. I had taken a shot with a Minolta SRT-101 using Tri-X film as a newspaper staff photographer of a full moon. When I processed it in the darkroom I had two images of the moon. I thought one was a UFO. My heart started to flutter. When I showed it to my Chief Photographer the next day he told me that the image of the moon passed through the lens onto the film and reflected forward to the UV filter I had on the camera which in turn reflected the image back onto the film in another location just millimeters away from the first image. So ended my shot of a UFO and my heart slowed down. It was truly a mind boggler for several hours.
Chip Blair
Ashland, PA


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6/16/2005 6:33:22 PM

 
Melissa  L. Zavadil
BetterPhoto Member Since: 2/26/2005
  Thats really weird!! Thanks for sharing! It is kinda cool in a way because I bet that you could not duplicate that again if you tried! :o)


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6/16/2005 6:37:55 PM

 
Swapnali Mathkar
BetterPhoto Member Since: 1/3/2004
  Hi Mellisa,

Can you check on the box in which the circular polarizing filter came? It should have a diagram which shows this phenomenon. I have the Kenko one and it's box describes it.
The C P filer works more efficiently when the light rays are falling on the filter at 90 degree angle. If this angle is reduced the effect is reduced.
CP filter has some imp usage
1. It reduces/ removes glare from glass or water. means if you are shooting a lake and dont want the water to shine, you can do that. Also if your subject is wearing glasses you can remove the glare from that glasses. If your subject is inside glass door, you can remove the glass shine and show as if there wasnt any glass.

2. You can increase the blue ness of the sky and get more saturated colours.



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6/16/2005 6:49:14 PM

 
Swapnali Mathkar
BetterPhoto Member Since: 1/3/2004
  I forgot to say, as you know now you can rotate the ring to increase or descrease the effect.
So when you turned your camera verticle the ring was in position which lowers the contrast. and probably at the right side of the rainbow, the light falling on the Cp filter has a different angle.


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6/16/2005 6:51:29 PM

 
Melissa  L. Zavadil
BetterPhoto Member Since: 2/26/2005
  Thanks so much Swapnali! I have to say I did not know most of this filter stuff! This is so interesting because I have been using this filter for a long time and this has NEVER came up! I am probably the ONLY person who doesn't know about this! LOL I really really apprieciate this this has been so helpful!

I do not have the box that the filter I was using with that lens anymore but I have this other one that I just purchased today for my new lens and I just looked at it. There is not a discription of this. :O(


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6/16/2005 6:59:14 PM

 
Nobu Nagase
BetterPhoto Member Since: 5/31/2003
  Looks like you have gotten good info on this. But the following link came in handy for me when I got my first polarizer.

Among other things, it has good tips how to use it including how the location of the sun affect the image you capture. Those things are good to know...


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6/16/2005 10:02:57 PM

 
Nobu Nagase
BetterPhoto Member Since: 5/31/2003
  ...oops sorry,... and that link is...

http://www.geocities.com/cokinfiltersystem/polarizer.htm


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6/16/2005 10:12:11 PM

 
Melissa  L. Zavadil
BetterPhoto Member Since: 2/26/2005
  Thanks Nobi!! That was great reading! I am surprised that none of these polarizar discussions have discussions requarding rainbows though. It seems strange because that is what it does (obviously) from my experiance.


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6/16/2005 10:35:50 PM

 
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