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TUBES Anonymous
how can i compensate for extension tubes without a light meter? im guessing with an old slr atm, and using my dslr to work out the settings...but i dont have tubes for my nikon dslr, only tubes for my old chinon slr?

asumming i add 3 cm of tube, how should that equate?
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Camera-Specific Properties:Equipment MakeKodakCamera ModelDCS Pro SLR/nCamera SoftwareAdobe Photoshop CS WindowsSensing MethodOne-Chip Color AreaColor Filter Array Pattern1090Focal Length (35mm Equiv)120 mmImage-Specific Properties:Image OrientationTop, Left-HandHorizontal Resolution300 dpiVertical Resolution300 dpiImage Created2005:05:28 08:53:21Exposure Time1/90 secF-Numberf/5.6Exposure ProgramAperture PriorityLens Aperturef/5.6Brightness5.8 EVExposure Bias0 EVMetering ModeMulti SpotLight SourceDaylightFocal Length120.00 mmColor Space InformationsRGBImage Width1322Image Height900Exposure Index160RenderingNormalExposure ModeAutoWhite BalanceManualScene Capture TypeStandardGain ControlNoneContrastNormalSaturationNormalSharpnessNormalSubject Distance RangeUnknown
>> Anonymous
     File :-(, x)
what does /p/ think of crazy eye
>> 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
>> Anonymous
>>247041
>you'd probably have to open your diaphragm up a little
DISREGARD THAT I SUCK COCKS, i meant "close up"
>> Anonymous
>>247042
i also did my math wrong. that'd leave you at 2, not 1.5.

but you can do the math and work it out.

saging self for fail.