After months of waiting for the weather to clear
I finally have my barn door tracker working, and the skies are
clear. These are the results of my initial calibration shots.
Altair, single image with 70mm lens (=150mm)
15 x 10 degree field. no image processing, 60 secs F5.6 - click
here for full size image
17.45hrs 55 deg N, 28th July - 4 stacked images
of 60 secs duration -
click here for full sized image
August - just outside of Bedale, North Yorkshire.
Finally a chance to try out the tracker with a clear dark sky.
The tracker performed very well. As I hadn't used the tracker
for several weeks I recalibrated the motor to run at 1 rpm -
took around 10 mins. Alignment was "good enough" and
the sky was a wonderful black - perhaps not as black as other
parts of the World, but black as it gets in England. Most of
my shots were taken with a 100mm (equivalent) lens, ASA 400
and around F2. One of the shots captured a meteor burning up
or possibly a satellite flare. The only thing that interfered
with the astrophotography was my telescope. I was having so
much fun looking through the scope that I kept forgetting to
1 - The handle of the Plough with Mizar towards the top
left corner. image taken 20 Aug 12, 23:05 hrs, 60 secs duration,
100mm focal length. Can anyone identify the satellite?
2 - Part of the Milky Way, towards the Zenith. Image taken
20 Aug 12, 22:48 hrs, 60 secs duration, 100mm focal length
3 - same as image 2, but processed to remove most of background
clutter in an attempt to make it easier to locate.