UV Filter

[Photo550D]

Sorry to sound so unintelligent but do you guys that use the Lee filter system attach a UV filter onto the lens then the holder or not bother. Only I noticed a lot of haze in my images and I believe a UV will help cut this out but not sure how it would configure with a Lee holder to prevent vignetting
How do you overcome this ?


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[mstphoto]

Theres mixed views on using UV filters. Basically they are just a bit of clear glass that can protect the front element from damage.
Whether or not they can cut through haze remains to be seen.
I personally don't use them.

Mike

[Lez S]

UV filters were a MUST for landscape photographers in the day's of film. Modern digital sensors have a UV coating
on them, so they are no longer needed. As Mike say's, people tend to use them nowadays purely for protection, I
don't use them either - unless I'm at a beach or a very dusty environment.

[Hugh]

Hi Mike - sorry a UV filter is not just a clear bit of glass, they actually filter out light with a wave length of less than 370nm (or 390nm depending on the filter). What is true though is that most people use them for the sole purpose of protecting the front element of their lenses and don't give a hoot about the UV filtering effects.

Having said that I don't use a UV filter for this purpose.

Back to the original post, anything that moved the filter holder forward will increase the chance of the holder being visible at the edge of the frame. The wider the angle of the lens the more likely this is to happen. This can be countered by using a special wide angle adapter ring which then moved the filter holder back. These should be available from most stockists (I don't think there are the supply 'issues' with these.

Regards

Hugh

[mstphoto]

Sorry, I stand corrected.

Mike

[StuBill]

How do you overcome this ?

Take a step back and use a slightly longer focal length ?

[Photo550D]

Thank you all for your input, I wasn't aware at all that modern sensors have a a UV coating? If that is the case I will not bother.

One final question, using a 105mm circular polariser on a 10-20mm lens with a W/A Adaptor and Lee holder apparently causes all sorts of problems and I wondered what the best way of getting round this issue is. It feels as though a 105mm CP is just not compatible with these lenses???

Sorry for all the questions, didn't want to commit to the cost if its not worth it.

[Hugh]

Hi Chris,

One of the effects that any Circular Polariser has is to darken the sky (when you take the image at 90 degress to the sun). Because of the extreme angel; of view of ultra wide angle lenses this darkening is not even throughout the sky. I am not ware of any fix for this though so I tend to avoid using my CP on my 10-20mm lens for darkening the sky.

Regards

Hugh

[Photo550D]

Hugh, this makes perfect sense, and having spoken to people since, it appears what you say adds up. CP's are not used with wide angle lenses, simply because it produces an even reflection of light when polarised through the filter. (??)

I guess there will be no CP being used with the W/A 10-20 then.

[StuBill]

It's because the front element of the super WA lenses are not flat.
Take a look at the front glass of the 10-20 - it's not flat but convex.
So, when using the CP, because of the curve, various parts of the front element are at different angles to the flat CP filter = uneven polarisation.