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Anonymous
depends on how long your lens is.
AFAIK, increasing your focal length this way will require you to compensate by the same measure by which you're increased your focal length. so if your lens is 30mm (3cm) long, and you add another 3cm, then you compensate for that by doubling the shutter speed.
if you're attaching to a 50mm lens then you'd probably have to open your diaphragm up a little (old focal length = 50mm, new focal length = 50 + 30 = 80mm, 80 / 50 = roughly 1.5, and you can't change shutter speeds in 1.5 stops unless your old SLR has DSLR-style exposure compensation). you could probably go three stops on your shutter speed dial and then stop *down* on your aperture by one stop, or something.
but wat do i no lol
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