 Jay A. Grantham |
Nikon D70s ISO Below 200 Justin made the remark in another thread:
Has anyone with this camera had a problem with not being able to shoot below ISO 200? --jay
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Michael Garth |
Jay, I own a D70 and don't find the ISO 200 limit being a burden at all. If you are shooting at ISO 200 and want 2 stops of additional exposure, that can be obtained three ways, by adjustments to either shutter speed or aperture and exposure compensation mode. For the first two: Simply and accurately meter the scene as is (let's say it's 500 @f/8), and either adjust the aperture two stops (f/4, in this case)keeping the shutter speed at 500 or adjust the shutter speed two settings slower (125 in this case) keeping the aperture at f/8. You can also set the camera to +2 exposure compensation. This will allow your camera to automatically expose at an additional two stops. Hope this helps. Mike
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Justin G. |
But Pete is arguing that his camera only adjusts the ISO and that that aperture and shutter never change. Others told him that it's just a custom function but he thinks that this is how exp com works. I do understand how it works in the scenario you gave b/c this is what I do with my Elan.
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Michael Garth |
Hi Justin. I'm not sure where Pete's argument is within the forum. All I see in this thread is Jay's reference to the D70. Let me look around here and see, what camera is Pete using?
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Jay A. Grantham |
My question has to do with "another" consideration between the D70s and the 20D. I'm saving pennies so I get all this time to ponder on my final decision.. ahh the life (and savings) of a public servant! --jay
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Michael Garth |
ahh, the life, I know it well. mike
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John G. Clifford Jr |
The ISO setting on a digital camera is just a way of expressing the sensor's gain. Usually, the lowest ISO (ISO 200 on the D70, ISO 100 on my SD10, ISO 50 on other cameras) is the setting where no gain has to be applied to the signals coming from the camera's sensor. For whatever reason, the D70's sensor is a little more sensitive to light than, say, the 20D or the SD10. Adding gain (increasing the ISO over the minimum) means that the signals are electrically amplified, which introduces noise (causes random pixels to slightly change color because the signal level is near a luminance boundary). Having a lowest ISO setting of 200 means little for nearly all photography. Perhaps you might have a hard time capturing an open-aperture shot on the ski slopes or at the beach on a bright sunny day... and perhaps not. In other words, it isn't a big deal... IF image quality at that lowest ISO setting is comparable to image quality from another camera at IT'S lowest ISO setting.
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- Gregory LaGrange Contact Gregory LaGrange Gregory LaGrange's Gallery |
It was pointed out by Jon Close in that thread that the D70 will change iso withing it's iso range. So if the exp comp calls for an iso lower than it's minimum, it will change the f/stop or shutter speed.
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Michael Garth |
Ok, Jon. That sheds some light on it, for me at least. This only happens if Custom Setting #5(ISO Auto) is selected and then the user elects to turn "ON" the Auto function. I've never used that function (I keep it in the "OFF" position). If someone wants to turn this function off, they must go into the CSM Menu to do it. Mike
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