tjo@gypsy.UUCP (01/03/86)
There's been some discussion recently about using tripods and the shutter speed you need to approach tripod quality without a tripod. What about cameras with leaf-type shutters, as opposed to focal plane? Since the total time that the shutter is open is considerably less, it would seem that you could get away with a slower speed and have less vibration than with a focal plane shutter. Anyone have specific experience with this? Of course, just about every modern 35mm camera uses a focal plane shutter. Another suggestion: if your focal plane shutter moves vertically across the film (as in my Nikkormat), you can probably use 1/125 and get stable results. At least, you can most likely use one stop slower speed than with an equivalent horizontal moving shutter. A final question: With a leaf shutter, why isn't the center of the negative overexposed, and the edges underexposed, since the shutter leaves the center of the negative open for a longer time than the edges?
feikema@mmm.UUCP (John Feikema) (01/14/86)
In article <24800003@gypsy.UUCP> tjo@gypsy.UUCP writes: > >A final question: With a leaf shutter, why isn't the center of the >negative overexposed, and the edges underexposed, since the shutter >leaves the center of the negative open for a longer time than the >edges? The shutter does NOT leave the center of the negative open for a lo9nger time than the edges. Remember you have a lens! If the situation you describe were a problem then when you stop down, i.e. reduce the diameter of the iris opening only the center of your negative (slide) would be exposed. Clearly this is not true. Take a look at an elementary optics book for a good explanation of what is going on. -- John Feikema MAIL: 3M Software and Electronics Resource Center Bldg 260-6A-08 St. Paul Mn. 55144-1000 BELL: (612) 733-1796 UUCP: ihnp4!mmm!feikema