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Converters, adapters and extension tubes All those lens accessories that get in between the lens and the camera.

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Old 26th June 2018
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Polarising Filter

How much does this improve photos? Can the same be achieved in Lightroom (Dehazing slider)

Worth it or not. Hoya do one for £18 or so, otherwise pay whatever you like...……….
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Old 26th June 2018
Jim Ford Jim Ford is offline
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Re: Polarising Filter

I've had a decent (Hoya) polarising filter for years, but have only used it for a couple of times. It's a faff to find the best position.

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Old 26th June 2018
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Re: Polarising Filter

Good to tame scattering from metallic surfaces and from water. At £18 why not give it a go (it's actually two filters allowing one to rotate relative to the one that is fixed, as you know I'm sure).
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Re: Polarising Filter

I always found it easy to "find the best position" on my SLR. Not tried it on digital mirrorless and absolutely useless on a rangefinder.
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Old 26th June 2018
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Re: Polarising Filter

Quote:
Originally Posted by MJ224 View Post
How much does this improve photos? Can the same be achieved in Lightroom (Dehazing slider)

Worth it or not. Hoya do one for £18 or so, otherwise pay whatever you like...……….

I don't think the dehaze slider can recreate the exact effect - like adding soft grads in Lightroom it will allow you to do something approximating the same thing but not the thing itself.


There's a great explanation of what you can - and can't achieve here.

http://www.cambridgeincolour.com/tut...ng-filters.htm





In 2016 I bought a used 37mm thread Tamron CPL from eBay for £7 to see if I could make use of it on the kit 14-42mm EZ lens. For the money it was worth the punt and it's still with me. Frankly it's not been out of the bag much. I rarely spend much time setting up as I'm generally taking pictures on family trips so I snap and go.


I found it did knock a couple of stops of light off the scene which in itself could be useful.



I also encountered an issue with weird graduation in the sky which I now understand but at the time puzzled me - I learnt about it when I posted this thread elsewhere...

https://www.avforums.com/threads/cir...#post-25690250


If you're interested but unconvinced there a loads on eBay for under a tenner.
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Old 26th June 2018
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Re: Polarising Filter

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Originally Posted by Ricoh View Post
Good to tame scattering from metallic surfaces and from water. At £18 why not give it a go (it's actually two filters allowing one to rotate relative to the one that is fixed, as you know I'm sure).
"it's actually two filters allowing one to rotate relative to the one that is fixed"

I beg your pardon?

That would be a variable ND filter, not a typical polariser. With a polariser you rotate the entire filter glass, not two separately as in a variable ND.

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Re: Polarising Filter

A polariser can give photos an extra bit of punch in bright conditions - think of wearing polarising sunglasses; clouds suddenly have a lot more dimension and contrast, the sky looks more blue, some colours can be enhanced. It can also make the colour in a scene look less natural.

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Re: Polarising Filter

Quote:
Originally Posted by Ian View Post
"it's actually two filters allowing one to rotate relative to the one that is fixed"

I beg your pardon?

That would be a variable ND filter, not a typical polariser. With a polariser you rotate the entire filter glass, not two separately as in a variable ND.

Ian
A polariser needs two elements, one to allow the X plane and the second to attenuate the Y plane of the EM wave, or vice versa. By rotating one relative to the other the degree of attenuation can be modulated. Scatter causes incoherence in the plane.
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Re: Polarising Filter

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Originally Posted by Ricoh View Post
A polariser needs two elements, one to allow the X plane and the second to attenuate the Y plane of the EM wave, or vice versa. By rotating one relative to the other the degree of attenuation can be modulated. Scatter causes incoherence in the plane.
Come on your wording implied there are two physical filters that need to be rotated by the photographer independently of each other.

There are, indeed, two components to a circular polariser. The second does rotate the linearly polarised light transmitted by the first layer, but both components are fixed and do not move relative to each other.

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Re: Polarising Filter

One other thing to look out for when using a polarising filter is non-linear darkening - especially of dark blue skies, which can sometimes look odd and also mess up panorama stitching.

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Re: Polarising Filter

Let me try again in simple terms. It’s one assembly and as I said above one glass surface is fixed, and the second is allowed to rotate. Light is a tricky son of a bitch, and all planes of orientation, on or off axis, are possible. The polariser helps discriminate the incoherent.

I’ll leave it there.
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Re: Polarising Filter

Quote:
Originally Posted by Ricoh View Post
Let me try again in simple terms. It’s one assembly and as I said above one glass surface is fixed, and the second is allowed to rotate. Light is a tricky son of a bitch, and all planes of orientation, on or off axis, are possible. The polariser helps discriminate the incoherent.

I’ll leave it there.
Not meaning to be unnecessarily bothersome, Steve, but that really doesn't sound right - the bit where you say "the second is allowed to rotate".

Polarisation is linear, regardless of whether the filter is an old fashioned linear type or the newer 'circular' type.

A circular type has linear polarising material on the scene-facing side. Bonded to that front layer is a second layer, on the side facing the lens, and this has the effect of turning the light wave as it passes through so in effect the wave spins around the axis of its travel and is no longer linearly polarised. But nothing in the filter glass sandwich physically moves independently, it's all one piece. The filter glass is usually (but not always) mounted so that it can be rotated in relation to the camera and lens. This is so that different angles of polarised light can be filtered according the the need of the photographer.

Ian
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Re: Polarising Filter

I think we're differing over semantics - the reason I'm being obstinate is that I feel there could otherwise be confusion.

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Re: Polarising Filter

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Originally Posted by Ian View Post
I think we're differing over semantics - the reason I'm being obstinate is that I feel there could otherwise be confusion.

Ian
One of my ex-colleagues would say "violently agreeing" - however my polarising filter is only one piece of glass and there's no revolving bits at all! (other than the whole filter)
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Old 26th June 2018
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Re: Polarising Filter

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Originally Posted by MJ224 View Post
How much does this improve photos? Can the same be achieved in Lightroom (Dehazing slider).………

The 'same' cannot be achieved in post-processing but in many cases it's effects can be simulated.



One use of a PL filter is to reduce reflections from the surface of water, to help in seeing what's underneath. That's why anglers use polarising sunglasses. If you like photographing fish, there's no substitute.



Another use is to increase contrast in skies and that can usually be simulated fairly well, by increasing saturation of the sky area in post-processing.


There are other specialist applications, such as showing stress lines in plastics, for which there is no substitute.



I do have some PL filters but confess I rarely use them.


The 'double' types, with two components, are intended as variable neutral-density filters, which can occasionally be useful.
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