Can I ask anyone who has any of the 'purple' Pilla lenses, do they really work ? It is only on rare occasions that I encounter an orange clay against a green background, they are mainly against the sky or trees. Would the lens be of use, for an orange clay against a blue sky for instance ? The 2 lenses that I use most are the 75 sort of pale brown colour and the 40 max orange on brighter days. As half of the shoot is in woods or shooting down into a quarry, there are only a few targets against a grass background. I am not into changing lenses between stands, preferring to pick 1 colour and stick with it. Before I spend any more money on lenses that will not get used a lot, any advice would be greatly appreciated.