For years I have used Kodachrome almost exclusively. I have done very little film coparing. I tried some Velvia and shot a particular scene on KR and, at least for this particular series of shots, the color saturation was significant (Velvia being more saturated). So, my questions are: 1) What are the disadvantages of Velvia? 2) What is the practical speed of Velvia 50 vs. KR64 (i.e. should I shoot Velvia 50 1/2 stop slower than KR64)? 3) I realize this question is closely related to #1: I have had a tendency to use one film for most types of shots. I've read the posts in this forum and it seems that Velvia is the choice for landscapes. What is Velvia NOT recommended for? 4) I read one forum post that inferred Velvia reacts strangely to a polarizer. I like my polarizer. What do I need to look out for in this regard? 5) Other transparency films I should consider? I know this is a lot of questions - I really appreciate any feedback I get!