I would like to say thanks to all who have responded to my questions, I eventual ly settled on a MPP MK V11 with a 90mm lens. Just a few more questions, I promis e that these are the last!!. 1; Can I use the Cokin P system with this lens,without causing vignetting ?. 2; Will I have to keep the bed dropped all the time to use this lens. Cheers. Lee.