How not to use a Circular Polarizing Lens
Sep 5, 2015 18:40:28 #
I bough a new CPL to fit to my new 16-300 lens and visited a local Koi pond to try out the combination.
The dwindling evening sunlight cast reflections on the water surface, so I screwed on the CPL, focussed and twisted the CPL to eliminate reflections.
Nothing changed so I moved along the pool edge to change the direction of the light hitting the water.
Nothing changed in spite of spinning the outer CPL at first slowly then furiously.
The sun disappeared, the fish went to bed, I stood at the pool edge waiting for the moon to cast a silvery beam on to the water surface so I could eliminate it using the CPL.
In the end, I came home and really examined the CPL.
A CPL consists of 2 pieces of glass, one static and one which spins. The static lens was missing.
Goes back to the shop on Monday.
The dwindling evening sunlight cast reflections on the water surface, so I screwed on the CPL, focussed and twisted the CPL to eliminate reflections.
Nothing changed so I moved along the pool edge to change the direction of the light hitting the water.
Nothing changed in spite of spinning the outer CPL at first slowly then furiously.
The sun disappeared, the fish went to bed, I stood at the pool edge waiting for the moon to cast a silvery beam on to the water surface so I could eliminate it using the CPL.
In the end, I came home and really examined the CPL.
A CPL consists of 2 pieces of glass, one static and one which spins. The static lens was missing.
Goes back to the shop on Monday.
Sep 5, 2015 18:47:32 #
All you to do was stand on one foot and do a slow pirouette.
It may not have worked, but would have been more fun! :lol: :lol:
It may not have worked, but would have been more fun! :lol: :lol:
Sep 5, 2015 18:49:43 #
Searcher wrote:
I bough a new CPL to fit to my new 16-300 lens and... (show quote)
Laughing, Welcome Back. LOL
Sep 5, 2015 18:50:09 #
DaveO wrote:
All you to do was stand on one foot and do a slow pirouette.
It may not have worked, but would have been more fun! :lol: :lol:
It may not have worked, but would have been more fun! :lol: :lol:
Get too giddy, would have joined the fish.
Sep 5, 2015 20:29:41 #
Searcher wrote:
I bough a new CPL to fit to my new 16-300 lens and... (show quote)
Obviously, they sold you the wrong version of the lens! The one you got is made for days when you don't need a CPL! I'd hang onto it. You never know when you might need it! :-D
Sep 5, 2015 20:53:24 #
Thanks for showing humor while having a frustration attack. And thank you for sharing that humor.
Sep 5, 2015 21:06:37 #
RWR
Loc: La Mesa, CA
Searcher wrote:
I bough a new CPL to fit to my new 16-300 lens and... (show quote)
Hope you didn't pay half price - they might charge you for the other half!
Sep 5, 2015 23:45:54 #
Sep 6, 2015 00:06:20 #
teesquare
Loc: USA
Nikonian72 wrote:
That is what you get for calling it a lens. It is a filter.
ANY piece of glass - which light passes thru - and has ANYTHING to do with focusing, filtering or altering the light in ANY way...is a lens. Such as a simple magnifier. Or your glasses that you wear.
Are they filters, or lenses...or both?
At least - that is the layman's explanation - and in accord with the normal explanations I have always understood.
So...'splain it to me - would please?
Sep 6, 2015 00:25:10 #
teesquare wrote:
The purpose of a lens is to change the direction of light; So...'splain it to me - would please?
the purpose of a filter is to change the quality of light.
Sep 6, 2015 02:09:33 #
Searcher wrote:
I bough a new CPL to fit to my new 16-300 lens and... (show quote)
You must be thinking of a variable neutral density filter; that has two polarizing filters which rotate against each other.
A CPL is a single piece that rotates.
To check whether your CPL is really a CPL, look at your computer screen through the filter (with the filter oriented with the threads facing you). As you rotate the filter, the screen should go black. If it just darkens a little, turn the filter around.
What could be wrong?
If you had to flip the filter to get the screen to go dark, then the filter is reversed in the holder and is defective. I've never tried taking one apart; not obvious how to do it. Take it back.
If the screen intensity doesn't change as you rotate the filter, then the filter is just a neutral density filter and you have a counterfeit. Take it back.
Sep 6, 2015 02:57:35 #
Searcher wrote:
I bough a new CPL to fit to my new 16-300 lens and... (show quote)
Don't know about your CPL, but the one I have is just a single rotating piece of glass - just the ring is split & rotates. Don't know about trying to photo a koi pond, either - but I had really good luck removing the reflections from a stream & photo'ing salmon swimming upstream in Whitehorse YT a few days ago.
Sep 6, 2015 04:53:56 #
I have several CPL's, all the same type, a static and a spinning glass "sandwiched" together.
This link will explain how they work:
http://photographylife.com/lens-filters-explained
This link will explain how they work:
http://photographylife.com/lens-filters-explained
Sep 6, 2015 04:59:18 #
Nikonian72 wrote:
That is what you get for calling it a lens. It is a filter.
I am not being argumentative . . .
so a Circular Polarizing Lens is actually a Circular Polarizing Lens Filter? (CPL filter)
Sep 6, 2015 06:04:58 #
Searcher wrote:
I am not being argumentative . . .
so a Circular Polarizing Lens is actually a Circular Polarizing Lens Filter? (CPL filter)
so a Circular Polarizing Lens is actually a Circular Polarizing Lens Filter? (CPL filter)
Are you sure that you were not putting this filter on a kaleidoscope? Something sounds fishy....
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