A belated STS-133 image taken during the second and last EVA of the mission. All other images I posted earlier of
this session were taken before culmination. This is a post-culmination image and we see clearly the 2 booms of
the Shuttle Robotic arm SRMS which are only 33 centimeters in diameter. On the other side we see a part of the
Station Robotic Arm SSRMS with at the end spacewalking astronaut Steve Bowen but now seen from an different angle
then in the earlier images.
http://freeimagehosting.nl/pic…7ef5e0110a66fcbe10c99.jpg
We see the astronaut from this angle (with the Shuttle seen from its back) almost of the front side. See simulation on page:
http://www.startje.be//vieuw.php?qid=375025
Also included is a raw frame because this was a rare good one. Generally the seeing on this location doesn’t allow
this quality and only parts of frames can be really sharp. In those cases, frames are selected on the parts which
show the useful details. With this information it is easy to understand that, aside from differences between frames
caused by the fast angular speed, it is not recommendable to stack limited numbers of frames when only parts are
sharp. The detail in the resulting image would be washed out. Only in very good seeing conditions this works out well.
In planetary imaging, were large numbers of frames (hundreds or thousands) are combined, the technique is much
more effective to get a useful average for sharpening.
Best regards,
Ralf Vandebergh
