 BetterPhoto Member |
syncing flash with macro lense I have recently purchased a macro lense, Promaster 100mm F3.5, and am not having any luck with pictures, when using the flash my pictures are underexposed. I only get a strip of the image. I am a layman when it comes to the technical words and don't have the manual for the camera anymore. I don't remember what is the shutter speed etc on the camera. I hope you can help me.
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Jon Close |
You only got a strip of image because the shutter speed was set higher than your camera's flash-sync speed. Your camera has a focal plane shutter. At slow shutter speeds it opens completely on the full frame of film. The fastest shutter speed that opens completely on the frame is the flash-sync speed. At shutter speeds faster than this, the focal plane shutter's 2 curtains form a slit that moves across the film plane, exposing only a portion of the frame at any moment. Because the duration of the flash is very short (1/1000 to 1/10,000 sec.), its light only affects the portion of the film where the shutter is open. The flash-sync speed varies by camera body. It is usually between 1/60 and 1/250 second. On older manual cameras it is usually marked on the shutter dial in red or with a symbol like "x-60".
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