Re: Telephoto Picture & Technical Analysis
- From: Hughes <eugenhughes@xxxxxxxxx>
- Date: Sun, 26 Apr 2009 18:22:20 -0700 (PDT)
On Apr 27, 9:07 am, Rich <n...@xxxxxxxxxxx> wrote:
Hughes <eugenhug...@xxxxxxxxx> wrote in news:da9020ae-37aa-4583-87e3-
a03ec4bdf...@xxxxxxxxxxxxxxxxxxxxxxxxxxxx:
Here is a photo I shot with the 1000mm telephoto with webcam.
4" aperture Telephoto 1000mm focal length f/10
webcam 1/4 inch CMOS 640 X 480 Sensor
I think I'm going to be sick. Now that cheap large sensors are here, even
the astronomical community isn't stupid enough to use 1/4" sensors with 8-
bit conversion for ANY images.
I found my old webcam in storage room I bought 3 years ago.
I can use it for free while I need to spend $500 on a new large
sensor DSLR like canon 1000D. They bought have same
pixel pitch of ~ 5.7 micron. How do you know my webcam
has 8 bit conversion? So you mean the higher bit conversion
of DSLR have very significant quality improvement (what's
the conversion bitrate for DSLR that you have used?)
5. To be noise resistance, does the pixel (or sensel) have to be
at least 4.7 micron? How about 2 micron pixel pitch like in digicam.
Is there no possibility to construct 2 micron pixel pitch in the
future with the same noisefree performance as present 6 micron DSLR?
Check out the actual sensor noise performance from 2001 till now with same-
sized and pixel count sensors. Not much difference, is there? Most of the
noise control has been achieved in post-sensor processing. So come back in
about 20 years and ask if a 2 micron pixel pitch can produce image quality
like a 6 megapixel DSLR.
Is this post-sensor processing inside the CCD component or
are you talking about software? So you mean to say 2 micron
pixel pitch have similar quality without the post-sensor processing.
But you also said in the first paragraph that webcam has only
8 bit while DSLR has higher bit conversion. So how can the
quality of the two be the same unless the bit conversion is
post sensor processing and PC software based?
Hugh
.
- References:
- Telephoto Picture & Technical Analysis
- From: Hughes
- Re: Telephoto Picture & Technical Analysis
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