Canon 40D housing

sosha · 3rd March 2008, 13:43

I use a Seatool housing for a Canon 400D. It's amazingly small, and rock solid. THey're recently come out with one for the 40D.

Take a look at it at the link above.

grunzster · 3rd March 2008, 14:45

Quote: (Originally Posted by NEDIVER)

Gill,

yes, yes and yes, when you are dealing with a compact camera like the SD 900 that you refer to, you have a smaller area that the original picture is projected onto, therefore your file size will be smaller, even though it is 10mp the "film size" or now the photo receptors makes a huge difference in the file size. the bigger the more detail.

Tom

Where are you getting this info from? I highly doubt this is true.

A full size sensor potentially = sharper image, less noise, etc. etc., but 10MP = 10MP = 10MP. If it's the same file format file, same type of image, exposure, colors, etc. and the same resolution, it should be relatively the same size.

**NEDIVER** · 3rd March 2008, 15:10

Quote: (Originally Posted by grunzster)

Where are you getting this info from? I highly doubt this is true.

A full size sensor potentially = sharper image, less noise, etc. etc., but 10MP = 10MP = 10MP. If it's the same file format file, same type of image, exposure, colors, etc. and the same resolution, it should be relatively the same size.

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

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.

RBailey · 4th March 2008, 06:36

Hi Tom,

Cycle time to for a proper eTTL exposure seems to be about a one to two seconds.

The Ikelite DS 125 strobes will "re-charge" in under a second and this is defeinately faster than the eTTL takes to "forget" the last settings.

If I just take a moment to re-compose or at least think about my next shot properly it seems fine, if I shoot like a machine gun it doesn't work.

Cheers,
Richard B.

3rd March 2008, 13:43	#21 (permalink)
sosha New Member Current Rebreather/s: Sport Kiss Other Rebreather/s: Sport Kiss Join Date: May 2006 Location: Northern California Posts: 28	Re: Canon 40D housing I use a Seatool housing for a Canon 400D. It's amazingly small, and rock solid. THey're recently come out with one for the 40D. Take a look at it at the link above.
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3rd March 2008, 14:45	#22 (permalink)
grunzster New Member Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Dec 2005 Location: NJ Posts: 28	Re: Canon 40D housing Quote: (Originally Posted by NEDIVER) Gill, yes, yes and yes, when you are dealing with a compact camera like the SD 900 that you refer to, you have a smaller area that the original picture is projected onto, therefore your file size will be smaller, even though it is 10mp the "film size" or now the photo receptors makes a huge difference in the file size. the bigger the more detail. Tom Where are you getting this info from? I highly doubt this is true. A full size sensor potentially = sharper image, less noise, etc. etc., but 10MP = 10MP = 10MP. If it's the same file format file, same type of image, exposure, colors, etc. and the same resolution, it should be relatively the same size.
(Offline)

3rd March 2008, 15:10	#23 (permalink)
NEDIVER Sic Semper Tyrannis Current Rebreather/s: Evolution Other Rebreather/s: Join Date: Jan 2008 Location: Nashua, NH Posts: 120	Re: Canon 40D housing Quote: (Originally Posted by grunzster) Where are you getting this info from? I highly doubt this is true. A full size sensor potentially = sharper image, less noise, etc. etc., but 10MP = 10MP = 10MP. If it's the same file format file, same type of image, exposure, colors, etc. and the same resolution, it should be relatively the same size. 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 __________________ -Tom- "slow is smooth, and smooth is fast" TM "Insanity is repeating the same thing over and over again, expecting different results" Albert Einstein
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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: 28	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.
(Offline)

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