On Fri, 19 Jan 2007 11:23:40 +0200, dan@@pixelphase.com wrote:

Pseudoscientific nonsense is no more welcome on this SCI group than it
is on any others.

_________________________________________________

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

Danilo Pivato wrote:

Danilo,
you are doing really a great job.
I like the way you organize your efforts.
what is a flat field camera?
do you still use film?

regards

On Sat, 06 Jan 2007 03:10:27 -0600, jerry ai5.net> wrote:

What is it you want to do? There are dozens of programs that can be used
to read, write, and display FITS files. If you're looking to spin
something yourself, the easiest way is to use the freely available
CFITSIO library, at http://heasarc.nasa.gov/fitsio/fitsio.html . This is
written by the same people who maintain the FITS standard.

_________________________________________________

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

zerge@hotmail.com wrote:

The white "lines" in several places do bear a remarkable resemblance to
fingerprints. How old was the film? There are also two triangular
shaped dots that could be defects on the film. A few more details on
what equipment was used in making these shots might help. I've recently
completed a series of test shots at half moon using a digital CCD camera
and I have no spurious spots anywhere (which help eliminate internal
light reflection issues).

The enlarged image looks a bit overexposed. Deliberate?

Hi Patrick,

If it doesnt decrease with another board, you have to rethink the
way you gain the data.
I dont know how the darklevel of each pixel is sampled in a cmos
sensor. But in my understanding, it has to be sampled just close
bevor the lightlevel, or has to be integrated for a longer time
to get rid of the low frequencies of the amp-noise.

Yes, but in the case that the read-noise increases with a longer
exposure time (and the brighter images were captured with longer
exposures), it would maybe pointing to a wrong darklevel acquisition.

Hi Patrick,

Ok, i am not very familiar with cmos devices, so my insight belongs
more to CCDs.
Nevertheless (is this a english word?), readout noise should be lower.

So the readout noise is more a quantization noise.

The December 2006 issue of AstroPhoto Insight is now available.
This issue includes the following articles:

* Color Management (Part 1) by R. Scott Ireland
* As The World Turns - Guided Imaging (Part 2) by David Sandage
* A Simple and Robust Piggyback Guider by Chris Peterson
* First Look at the Tele Vue "is" Series by Jim Burnell
* Finding the Unknown, Even in Light-Polluted Skies
* Amateur Science - Getting Started in Photometry (Part 2)
by Tom Krajci
* Vignette Correction without Flat Fields by Blair McDonald
* Vista Ready?

You can download a copy of AstroPhoto Insight now using the following
link:
http://www.astrophotoinsight.com

Clear skies,
Al Degutis

Hi Patrick,

But this seems to be important, is the acquisition board designed
for imagers, what method is used, CDS (correlated double sampling)?
What is the exact sensor name?
I think in the time i have all informations needed to get the
reason, i can design and built a complete new camera ;-).

Is the project an astro camera?

Best regards,
Jens

Looking for opinions from anyone who has read The Meaning of Relativity. I
collect books in fine bindings for my home library and found a very nice
copy of The Meaning of Relativity on eBay below, but was wondering if a
non-scientist would find it interesting. Or is it a bit too technical? If
it's an interesting read, I think I'll bid on it.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=170057950676