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Date: 13 Nov 2006 01:54:04
From: Protagonist
Subject: Canon DSLR's
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I have a Canon 300D, quite bulky camera, but a few years ago was rated
excellent for astro photography.
How about the Canon newer models, like the Rebel XT or the others ,
since they uses different CCD chip now days?
How they work for astro imaging?
Thx, Julius
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Date: 13 Nov 2006 08:51:28
From: S. Caro
Subject: Re: Canon DSLR's
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Protagonist wrote:
> I have a Canon 300D, quite bulky camera, but a few years ago was rated
> excellent for astro photography.
> How about the Canon newer models, like the Rebel XT or the others ,
> since they uses different CCD chip now days?
> How they work for astro imaging?
> Thx, Julius
All Canon DSLR cameras use CMOS sensors, not CCD. The megapixels
have changed, but the sensor design remains pretty well the same.
The newer cameras have a bit better high ISO performace because
better noise reduction algorithms.
If you're serious about astrophotography, you might want to
hunt down a Canon 20Da This model was designed specifically for
the night sky. I believe they are out of production now, but
you might be able to pick up a used one.
http://www.canon.co.jp/Imaging/eos20da/index.html
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Date: 13 Nov 2006 15:31:10
From: Chris L Peterson
Subject: Re: Canon DSLR's
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On Mon, 13 Nov 2006 08:51:28 -0600, "S. Caro" <scaro@muxnet.com > wrote:
>All Canon DSLR cameras use CMOS sensors, not CCD. The megapixels
>have changed, but the sensor design remains pretty well the same.
>
>The newer cameras have a bit better high ISO performace because
>better noise reduction algorithms.
Minor quibble: unlike most digital cameras, the low noise performance of
the Canon CMOS sensors is intrinsic to the sensor design, and isn't a
product of any algorithm. AFAIK the Canon cameras are the only ones
where the raw images are truly raw- no processing has been applied
except for a scaled dark frame subtraction. Nikon and other cameras
apply noise reduction techniques in the process flow _before_ a raw
frame is saved. As is always the case with noise reduction filters, this
means that actual information is destroyed as well. IMO this makes the
Canons the best digicam choice for astronomical imaging.
_________________________________________________
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
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Date: 13 Nov 2006 17:18:37
From: Rich
Subject: Re: Canon DSLR's
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Protagonist wrote:
> I have a Canon 300D, quite bulky camera, but a few years ago was rated
> excellent for astro photography.
> How about the Canon newer models, like the Rebel XT or the others ,
> since they uses different CCD chip now days?
> How they work for astro imaging?
> Thx, Julius
Good sensors, rotten ergonomics. Get a 20D or 30D instead, or a Nikon
D80.
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Date: 14 Nov 2006 20:16:13
From: nytecam
Subject: Re: Canon DSLR's
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Protagonist Wrote:
> I have a Canon 300D, quite bulky camera, but a few years ago was rated
> excellent for astro photography.
> How about the Canon newer models, like the Rebel XT or the others ,
> since they uses different CCD chip now days?
> How they work for astro imaging?
> Thx, Julius
I believe all Canon DSLR sensor are CMOS not CCD - DSLR
Nikon/Pentax/Minolta=Sony/ all use Sony CCDs but each tweaked with
their own processing engines.
I'll be sticking with my 300D - there are few advantages using smaller
pixels via 8Mp/10Mp sensors except potentially more noise and you have
to ask if your current imaging optics and guidance are 'up to it'. Now
the full frame 5D....
--
nytecam
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