Re: Observation: 17P/Holmes from Montana

On Fri, 26 Oct 2007 01:54:13 -0400, "Dennis Woos" <dpwoos@xxxxxxxxx>
wrote:

However, I saw the outer coma as more defined around the outer edge, and
brighter in contrast to the darker inner annulus. In general, I saw more
detail in the eyepiece, and I am surprised that I haven't yet seen a photo
showing as much/more than what I observed! Is there some reason why this
comet is hard to photograph?

It has a very wide dynamic range, which does make imaging a challenge.

_________________________________________________

Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
.

Relevant Pages

  • Re: Observation: 17P/Holmes from Montana
    ... brighter in contrast to the darker inner annulus. ... detail in the eyepiece, and I am surprised that I haven't yet seen a photo ... It has a very wide dynamic range, which does make imaging a challenge. ...
    (sci.astro.amateur)
  • Re: On-axis, off-axis, and neutral axis light
    ... because of the shadow in the on-axis rays coming into ... black is added to the image resulting in lower contrast. ... If we take an eyepiece that has a long enough ... light path from the primary combined with the pupil ...
    (sci.astro.amateur)
  • Re: On-axis, off-axis, and neutral axis light
    ... black is added to the image resulting in lower contrast. ... the center of the image is off axis light. ... If we take an eyepiece that has a long enough ... light path from the primary combined with the pupil ...
    (sci.astro.amateur)
  • Re: Ultra Dark-Adaptation?
    ... What if a really good night allows more stars to be visible in the eyepiece, the increased light of which causing a slight shift toward photopic vision, which then enhances the apparent contrast? ... For the borderline objects the effect in the eyepiece is more dramatic than photometry can account for. ... Contrast is the result of two factors: how much light is being transmitted and the amount of natural skyglow. ...
    (sci.astro.amateur)
  • Re: On-axis, off-axis, and neutral axis light
    ... the parallel rays exit the eyepiece with the shadow of the ... as if the surface of the eye has sensor for the actual image. ... the image contributed to the total reduction of contrast. ... At lower power, this doesn't contribute to any lost of contrast ...
    (sci.astro.amateur)
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