Filtered

paul.r.w · #1 29-08-07

Hi, I just got a polarising filter and wondered why the outer ring turned and why it has an arrow on it come to that?

Stephen · #2 29-08-07

Quote:

Originally Posted by paul.r.w

Hi, I just got a polarising filter and wondered why the outer ring turned and why it has an arrow on it come to that?

Because it works by rotating the glass to get the maximum effect. It has to rotate independently of the filters screw mount

paul.r.w · #3 29-08-07

So you turn it to get varying amouts of filter then?

Stephen · #4 29-08-07

Quote:

Originally Posted by paul.r.w

So you turn it to get varying amouts of filter then?

Pretty much yes, though its a little more complicated. You should be using a Circular polarizing filter. There are actually 2 layers of glass and the outer one rotates against the inner one. Also the amount of polarizing effect depends on the angle the lens points in relation to the sun and how wide your lens is. Are you totally confused yet

paul.r.w · #5 29-08-07

nope but I'm getting there!

It's a Kenko Wideband Circular Polarising Filter, which I had great difficulty getting off after I put it on.

So...you point the arrow to the top ang go left or right from there or is that too simple?

Stephen · #6 29-08-07

Quote:

Originally Posted by paul.r.w

nope but I'm getting there!

It's a Kenko Wideband Circular Polarising Filter, which I had great difficulty getting off after I put it on.

So...you point the arrow to the top ang go left or right from there or is that too simple?

I would think so, but you can have fun experimenting. the beauty of it is you can see the effect instantly through the lens and then in your screen, easy peasy

paul.r.w · #7 29-08-07

Thanks Stephen, I'll sit atop of the Aswan Dam and fiddle about!

That's if I don't fry first!!

Jocelyn Walker · #8 30-08-07

I bought both circular polarizing (Hoya) and UV 55mm filters whilst on holiday in Queensland! I can't understand why they would have to be rotated once on as they don't look graded in any way. The reason I bought them is that when trying to take pics from the ferry back from Fraser Island of the sunset...try as I may, I couldn't get the camera to not pick up massive flares, rendering opportunity useless! My next sunset shots with a filter was fine!

Pol · #9 30-08-07

Quote:

Originally Posted by Jocelyn Walker

I bought both circular polarizing (Hoya) and UV 55mm filters whilst on holiday in Queensland! I can't understand why they would have to be rotated once on as they don't look graded in any way. The reason I bought them is that when trying to take pics from the ferry back from Fraser Island of the sunset...try as I may, I couldn't get the camera to not pick up massive flares, rendering opportunity useless! My next sunset shots with a filter was fine!

To put it simply - because I don't know enough to put it any way other than very simply - the polarising filter allows light to enter the lens only in a specific direction and absorbs other light. So you can turn the filter to direct the light to where you want it and block it from where you don't want it. Something along those lines.

Hopefully someone with a better grasp of the technical functions and language will step in and explain better than I ever could.

Pol

Pops · #10 31-08-07

Quote:

Originally Posted by Pol

To put it simply - because I don't know enough to put it any way other than very simply - the polarising filter allows light to enter the lens only in a specific direction and absorbs other light. So you can turn the filter to direct the light to where you want it and block it from where you don't want it. Something along those lines.

Hopefully someone with a better grasp of the technical functions and language will step in and explain better than I ever could.

Pol

I for one always find your explanations address the topic head on in simple to understand terms.
Don't you ever change and go all techy

Pol · #11 31-08-07

Quote:

Originally Posted by Pops

Don't you ever change and go all techy

There's no chance of that ever happening! I'm married one of those 'techy types' (the ultimate 'kit man' too) and have endured endless technical waffle for the past 35 years as he persists in blinding me with science. I've learned to close my ears to most of it and try to work out a simple one-liner from his 'lectures'.

Pol

Stephen · #12 31-08-07

Quote:

Originally Posted by Pol

There's no chance of that ever happening! I'm married one of those 'techy types' (the ultimate 'kit man' too) and have endured endless technical waffle for the past 35 years as he persists in blinding me with science. I've learned to close my ears to most of it and try to work out a simple one-liner from his 'lectures'.

Pol

Well its better than my wife, her eyes glaze over at the mention of cameras or computers

Pol · #13 31-08-07

Quote:

Originally Posted by Stephen

Well its better than my wife, her eyes glaze over at the mention of cameras or computers

Mine glaze over too when he starts - especially when he starts hinting for yet another camera.

I'm *still* being subjected to examples about polarising light. Stuff such as "imagine a beam of light from each point of a multi-angled star - blah, blah, blah" I mean - I know how the thing works! I just wanted a simple one-liner explanation to convey my meaning - not gobbledegook!

Pol

Jocelyn Walker · #14 31-08-07

Thank you! I too prefer the 1 liners, as I'm very practical & lose interest with waffle! You explained it very succinctly! So yes...yet another thing to twirl & experiment with!