Here is the label of my 250w HPS OVZ ballast, I hope you can read it. o.o
Sorry for the foul quality grainy picture, it's like that because my mom's camera, which I use to take all my pictures, is missing, so I used my iPod camera.
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Updated the picture, now you can read it! 8D You might have to refresh the page...
Yeah what he should have done is put an ACTUAL light over it...that would have solved the grain problem! It would have LOWERED the ISO of his iPod making it less grainy!
Aaron, if you know photography......the fact that higher ISO means brighter pic on picture from dark room but more grainy.....so iPod or any other cameras with flash turned off will increase ISO....but higher ISO means more grain pics....so in general....your goal is to use the lowest ISO as possible but have good light amount....
Higher ISO makes it easier to take pics at night but makes grainy pics........
I used my dads camera for this picture (Used to be my mom's and I used to use the camera for all my streetlight pics) Since my mom's camera is still lost..
ISO is a measure of how sensitive the imager is ( how much gain is used on the signal to get an output to the processor), whilst the shutter speed is an indication of how long the imager is allowed to integrate the light it gets ( used to be the time the shutter was physically open , now is a timer that discharges each pixel cell to a low reference, then allows it to generate charge proportional to the light on it, before reading it out row by row).
So a low ISO is selected when the image is bright, to keep shutter speed in the range of around 1/500 to 1/50 of a second. and if the image is dark then the gain is turned up ( higher ISO) to keep the exposure time in there, so there is less motion blur and visible shake on the image.
The problem of high ISO is the signal is in the mV range, and the imager is going to have a lot of thermal noise that will become very visible on this signal, whereas with a low ISO the noise is only visible if you look carefully at the image, and is mostly removed by the conversion to JPEG. The noise is still there, but the signal is so much larger that it is not easy to see any more. Thus you do need a lot of light, when the iPhone/iPod camera is a pretty good unit.
Not a bad camera for the small optical block and very small imager used. The issue with most cellphone cameras is not the imager or the optics, but the firmware that is set for a massive amount of compression of the camera data, losing a lot of detail in the process. Most of the time the imager is only going to give 3MP of data before it becomes diffraction limited, and more MP only means more pixels per block that is projected onto the chip, not that you can get a sharper image but that there are more pixels sharing the same data.
I used the FTP and stuff like that, you can't do that without access to FTP. Maybe I can get Jace to install something that would let you update a pic.
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![IMG_0104[1].jpg](albums/userpics/thumb_IMG_0104%5B1%5D.jpg "Filename=IMG_0104[1].jpg
Filesize=115KiB
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Date added=Sep 12, 2011")
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Dimensions=726x358
Date added=Sep 12, 2011")
Higher ISO makes it easier to take pics at night but makes grainy pics........
I suppose high iso with a tripod would allow for a good less grainy pic?
So a low ISO is selected when the image is bright, to keep shutter speed in the range of around 1/500 to 1/50 of a second. and if the image is dark then the gain is turned up ( higher ISO) to keep the exposure time in there, so there is less motion blur and visible shake on the image.
The problem of high ISO is the signal is in the mV range, and the imager is going to have a lot of thermal noise that will become very visible on this signal, whereas with a low ISO the noise is only visible if you look carefully at the image, and is mostly removed by the conversion to JPEG. The noise is still there, but the signal is so much larger that it is not easy to see any more. Thus you do need a lot of light, when the iPhone/iPod camera is a pretty good unit.
Not a bad camera for the small optical block and very small imager used. The issue with most cellphone cameras is not the imager or the optics, but the firmware that is set for a massive amount of compression of the camera data, losing a lot of detail in the process. Most of the time the imager is only going to give 3MP of data before it becomes diffraction limited, and more MP only means more pixels per block that is projected onto the chip, not that you can get a sharper image but that there are more pixels sharing the same data.