Gareth Tucker

Regarding what John_P_Pytlak of Kodak said - Many thanks John. After looking at the charteristic curves I'm certain that the information I'm after is in there the only problem is that I cannot translate the graphs into a useable form. For example the chr curve graph for K40 is quite steep, implying that it records quite a narrow range (or in other words is a quite high contrast film) recording as black what might to the naked eye have a lot of detail. My problem is that I want to be precise and know that if a particular area of the scene is say 2 stops down from my key light, will it still register (in the shadows) or do I need a little more light to make sure that area of the scene will record ? I think my use of word "latitude" was maybe incorrect as it implies a sort of margin for error which is not what I'm after.

Hello Would anyone be able to tell me the latitudes of Kodachrome 40T, Ektachrome 7250 and Ektachrome 7239. To make this request more clear (as peoples definitions of latitude tend to vary) I would like to know the number of stops from correct exposure down to solid black and up to pure white and if possible a safe working margin for highlights and shadows still retaining detail. I have searched Kodak's website for one of those incredibly helpful photographs with all the f stops marked on the differnent tones but can only find them for the newer stocks. Many Thanks Gareth Tucker student film-maker, England

Two things spring to mind. Firstly that "daylight" is not at a fixed colour temperature and is slightly bluer at certain times of day in certain places. And secondly, I have been told that U.V light can register in the blue region of an image and in daylight there is a lot of U.V invisisble to the naked eye but visible to film. Although my first instinct is that any filter used on the camera will cut the majority out. G.