sigma 10-20mm....which filters?

[Alan Hewitt]

Be very careful using a polariser on an ultra wide angle lens!! The effect is very much spoilt and uneven at such wide angles. A polariser is designed for optimum use at 90 degrees to the sun. As the lens will be wider than this view what often happens is the darkest polarised area is towards the middle of the frame and lightens at the side. Looks very odd, but if you like this effect then go for it!

Using Wide Angle Lenses

It is briefly covered in this link!

Also take care with extreme ND filters as they do vignette a lot.

Mostly I used ND Grads on my sigma 10-20 but care is necessary as the widest angle can often see the filter holder!! I use a LEE wide angle filter holder for this reason.

[PMG]

I have a 10-20 Sigma and have never used an on-camera filter. There have been odd times when photographing still water when a polarising filter would have been useful but I would be wary of it making parts of the view dark. I do all my adjustments after with Adobe - esp the graduation filter when skies can be darkened, clouds rendered whiter, and foreground colour enhanced etc.

Pauline

[roseway]

There's little or no point in a UV filter on a digital camera, because the sensor and its circuitry filter out UV anyway. You might like to have one just to protect the front element of the lens from damage, but make sure you get a good one, otherwise it's more likely to degrade the picture quality.