is only a hint of my results. I am still processing
Note about time measurement:
I adjusted my digital camera clocks (manually)
according to radio controlled clocks. My notebook was
adjusted a few hours before starting observation using
internet atom time server. I suppose the precision better
than 1 second.
Exact time of camera exposures was imported from EXIF
information included in each JPG camera image (this is the
new feature of K3CCDTools 2.1).
The time of AVI frames was taken from log file (again a new
feature of K3CCDTools 2.1).
Unfortunately, weather was not cooperating well. In about
half of Venus transit clouds appeared and sometimes they
made it impossible to take any photo.
the image to see picture with higher resolution (3.19"/pixel).
|Venus transit sequence
Camera: Nikon Coolpix
Telescope: 80mm F5
Refractor, 25mm eyepiece afocal
AstroSolar™ foil sun filter
Result focal length: 496mm (~60X Zoom)
Result focal ratio: F6.2
Exposure: 28x 5x 1/1000s (ISO100, auto white
Camera control: K3Nikon
Processed by K3CCDTools
2, then in K3APEX
The period between Venus positions is 10 minutes.
Missing positions of Venus were caused by clouds
:-(, which disabled to take pictures at proper
time. After appearence of clouds I was forced to
take exposures during clear sky, so some
positions of Venus are not exactly in 10 minutes
It's interesting to see a track of group of
sunspots in the center of Sun's disk, which is
casued by Sun's rotation.
1, 5 exposures were taken each 10 minutes.
Finally I had 28 useful groups of frames
2, To ensure the best picture sharpness (the
telescope was only cheap achromat), I used only
green channel using Green
Input Filter in K3CCDTools 2
2, Each 5 frames group was separately aligned and
stacked in K3CCDTools 2 (+histogram
postpocessing, gamma 0.70, unsharp mask (2,0,100)
3, 28 result pictures were loaded in K3CCDTools 2
and were aligned
4, The result was stacked by using the new K3CCDTools
Darker" stacking method
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