Re: Eyes vs Digicam in SCT Imaging

On Apr 22, 7:30 am, Chris L Peterson <c...@xxxxxxxxxxxxxxxxxx> wrote:
On Tue, 21 Apr 2009 15:20:15 -0700 (PDT), Eugene <eugenhug...@xxxxxxxxx>
wrote:

When you look thru an 8" SCT with 80X magnification,
the contrast and brightness is very good for both
nightime and daytime use. However, if you use a
digicam directly connected to the rear of the SCT,
it would function like a 2000mm telephoto.
Now because 50mm is like 1X, 2000mm
is equivalent to about 40X magnification.

Not at all. You can't think of magnification this way.

the digicam like Canon 400D has difficulty with
the 2000mm telephoto. Images in viewfinder
is dark and it has difficulty locking into the target.

When you use an EP, you normally get all the light from the aperture
into your eye. When you are looking through the camera viewfinder, only
part of the light is going to your eye, and that is going through lossy
components as well.

Could it be because the eyes
retina has better technical specification than
the pixel sensor in the digicam?

No. Even the worst camera sensor substantially outperforms the retina.
_________________________________________________

Chris L Peterson
Cloudbait Observatoryhttp://www.cloudbait.com

Then how come the Canon 400D can't work well with the
8" SCT functioning like a 2000mm telephoto lens??
Equivalent magnification is 40X. Brightness and
contrast is dim and poor when imaging say garden
at daytime. How do you make the pictures as good
as when simply looking at the eyepiece at 40X-80X?

E
.

Relevant Pages

  • Eyes vs Digicam in SCT Imaging
    ... When you look thru an 8" SCT with 80X magnification, ... the contrast and brightness is very good for both ... digicam directly connected to the rear of the SCT, ...
    (sci.astro.amateur)
  • Re: viewing galaxies
    ... >> If your goal is to see structure, more important than brightness is ... Contrast increases with magnification. ... >>you can't beat dark skies, a large aperture, and lots of magnification. ... The dark-adapted eye is not good at resolving ...
    (sci.astro.amateur)
  • Re: Detecting the "ringness" of the Ring Nebula
    ... >> As magnification changes, object, sky and details within ... As Roger notes, everything changes brightness equally, so ... there is no change in contrast. ...
    (sci.astro.amateur)
  • Re: Detecting the "ringness" of the Ring Nebula
    ... >>improved by increasing magnification. ... As Roger notes, everything changes brightness equally, so ... > contrast increases with increased magnification. ... notes "apparent contrast" does. ...
    (sci.astro.amateur)
  • Postcscript: Hi-tech Accessibility Catch-22
    ... >> and contrast for you. ... > brightness from the '80' default, ... Having used the Samsung flat panel for a week now, ... over its advantages vs. the flat CRT monitor I used before. ...
    (uk.people.disability)