I was messing about with a range of filters, and focal lengths, and thought I would see if I could get enough magnification to image a couple of doubles.
The seeing was appalling, stars roiling and boiling, so experimented with different exposures and ISOs. At the ridiculous focal length that these
images were obtained, I had to use ISO 6400.
102mm f/5 with 2x and 3x barlows stacked, and 6.4mm EP = 3,000mm f/length, and a stupid 468x mag.
First one is aCru, and the second is aCen.
raymo
They are straight from the camera except for cropping and resizing in PS
Dunk.
The colour is due to the fact that I was using a no.11 yellow filter at the
time Colin. I was playing at CA reduction.
raymo
It was just a bit of fun Rob, with aCen being harder to get nice round stars
from due to it's lower altitude. They are a bit dim because I used fairly high shutter speeds to get rid of the diffraction rings, leaving clean edges.
raymo
Hi Skysurfer, I saw the still frames, but gave up waiting to see the video
after about 3 or 4 minutes. I don't know whether it was just glacially slow
downloading, or not downloading at all.
cheers raymo
Raymo,
Interesting stuff....
If you can get a hold of a webcam (or similar) then Florent Losse's excellent software can be used to measure and analyse the images.... http://www.astrosurf.com/hfosaf/uk/doeva1.htm florent_losse(at)yahoo(dot).fr
Drop him an email, mention my name and get the latest freeware version.
