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grunzster · 3rd March 2008, 16:57

Quote: (Originally Posted by NEDIVER)

you are absolutely correct, Sensor size contributes to may things, especially noise. The more densely packed the megapixel race pushes sensors, the more noise manufacturers must deal with the issue. Most of your 10mp non-DSLR no have 400 ISO on up that are somewhat useable to downright mushy because of noise reduction. While DSLR maybe have 10mp, the chip is physically larger, thus the density is lower. DSLR have 3 chip sizes now, all of which are much larger than point and shoot type sensors.

It is this increase in "quality" that allows the camera to produce a larger file (more detail). For example there are three settings on the Canon 40D that record the image at 10.1 mega pixels. they are Large/Fine, Large/Normal (both JPEG), and RAW. All three settings have different file sizes. They are 3.5MB, 1.8MB and 12.4MB's, respectively. This data comes directly from the instruction manual.

I apologize if I wasn't clear in what I was saying before. I hope I did a better job this time.

Tom

Ok I get what you're saying, but it is really dependent on the settings you use.

In your example you're getting different file sizes because of different compression levels. More detail doesn't necessarily = more MB if the files are the exact same resolution, format, comression level, etc.

In other words 2 RAW files, one from a full sensor and one from a cropped sensor, should give you relatively the same file size, although the overall quality on the full sensor shot will most likely be a little better.

3rd March 2008, 16:57	#24 (permalink)
grunzster New Member Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Dec 2005 Location: NJ Posts: 37	Re: Canon 40D housing Quote: (Originally Posted by NEDIVER) you are absolutely correct, Sensor size contributes to may things, especially noise. The more densely packed the megapixel race pushes sensors, the more noise manufacturers must deal with the issue. Most of your 10mp non-DSLR no have 400 ISO on up that are somewhat useable to downright mushy because of noise reduction. While DSLR maybe have 10mp, the chip is physically larger, thus the density is lower. DSLR have 3 chip sizes now, all of which are much larger than point and shoot type sensors. It is this increase in "quality" that allows the camera to produce a larger file (more detail). For example there are three settings on the Canon 40D that record the image at 10.1 mega pixels. they are Large/Fine, Large/Normal (both JPEG), and RAW. All three settings have different file sizes. They are 3.5MB, 1.8MB and 12.4MB's, respectively. This data comes directly from the instruction manual. I apologize if I wasn't clear in what I was saying before. I hope I did a better job this time. Tom Ok I get what you're saying, but it is really dependent on the settings you use. In your example you're getting different file sizes because of different compression levels. More detail doesn't necessarily = more MB if the files are the exact same resolution, format, comression level, etc. In other words 2 RAW files, one from a full sensor and one from a cropped sensor, should give you relatively the same file size, although the overall quality on the full sensor shot will most likely be a little better.
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