cokin

Hi could someone point me into the right direction on filter holders A or P or are they the same, thanks paul

A is smaller than P. It depends on the filter thread size of the lenses that you are using as to which you nedd. So, anything above 58mm (I think) will need the larger size holder and corresponding filters.

Also if you have a very wide angle lens you might need the P size or even larger anyway to stop vignetting.
Cokin do X-Pro and Z-Pro sizes as well!
Hope that helps
Andy

Hey
here you go Cokin website
A serie use smaller filters and isn't suitable for wide angle lenses, just get the P it doesn't cost much more.

The Z-PRO use even lager filters so there are also suited for wider lenses but alsohave higher quality filters.
My Z is on his way but because of christmas and new year they will only arive the 5th of January

A (Amateur) are small, P (Professional) are big.

P is the safe bet for maximum suitability for your lenses.

thanks all shall look into the P size thanks again

If you use wide angle you will still get vignetting with the P series. look at the Z=Pro range too which will avoid this.
I went for Lee filters in the end after much research and am so far happy with them.

The Z-Pro system is much more expensive almost double the price and Cokin now has a special P wide-angle holder that holds only 1 P-filter
link

Do they mean on film or full frame down to 20mm?

You can go down to about 13mm on Pentax digital with the ordinary unbranded P holder I have.

Okay, I stand corrected

Yes as they say on 35mm format so full frame.