FIlter Theory

So....what FIlters do i Really need? It's a question i have been pondering for some time. WHile there is a plethora of filters out there which ones are the most practical and usefull? COnsidering the variety of Film Stock that i have(B&W, Tungsten,Daylight,Slide) and the different situations that i' using them in, Ihave come up with a list tha will suit me. This of course is a fluid and Dynamic list as each Photografer has his or her own opinion and rightly so, however i think i'm pretty close to the mark i feel in what is overal most usefull. There are a lot of 'Trick' or novelty filters out there and they have their applications and whith all the filters that i have collected over the Years i find that the trick type filter need a certain degree of planning ie you'll be going out deliberatly to use a particular filter to achieve a particular effect. Whereas other Filter are just commom tools of the trade. I also find that i don't mind usin filters larger than the lens i'm using in part to avoid vignetting, in part as it's personal preference and in part that's what i was able to get me hands on at that time. So here 'tis a list of must have's
UV or UV Haze
Polarizer (i did read a C-PL can be used on every Camera, an L-PL only for Manual Focus type. I carry both types as i have both camera types, but if C-pl can used instead of L-PL's than thats a couple of FIlters less i'm carrying)
80A
85B
NDx2,x4,x8
Fl-D
Fl-W
Center Filter (heliopan x2 type) - haven't got one yet but i'm working on it
And now for the should/could have
A set of colour FIlters(R,O,G,Y,B)
Soft DIffuser
I also use a Set of Varicolours (R,B,Y,G)
and a set of Graduated Colours(R,B,G,Y,O,Pink,Tobacco,Gray/.2 ND)
There are a few others but i won't list them as they fall into the Trick category IMHO.
There more the may need to be included, there may be some that i don't really need in that list. it's not set in concrete but they come in handy with the wide variety of lighting conditions that one is face with.
Thing to keep in in Mind is As Many as is is practical, but but as few as possible.
And when you are on a shoot, i you haven't got with you, there 's no sense pining for it(Lief Ericksenn)