Quote:
|
Originally Posted by Robert_T
Dennis this one is truly poster quality 
Your "mooning" is the best! 
any tips for getting the right exposure - I always seem to be under or over exposing - and processing in registax to get sharpness over the whole field?
cheers, |
Hi Robert
For most of the images, I used my default settings of:
Brightness slider: approx midway.
Gamma slider: hard to the left.
Exposure: 1/25 sec.
Gain slider: hard to the left.
Frame rate: 10 fps.
Grab time: 180 seconds.
However, after some feedback from the IIS crew, I discovered that K3CCDTools has a “live” histogram bar which reads from 0 to 255.
On Lunarscapes with a large brightness range, the default settings used to produce pure white highlights on the rims of strongly sunlit craters. By sliding the Brightness left (decrease) and Gamma right (increase) I noticed that often I could prevent the numbers from maxing out at 255 in the histogram bar, yet still keep the image looking satisfactory.
Previously, I believed that Gamma had to be hard left and never touched, just like the Gain slider which appears to give me lots of grain and a “thin” image when I am forced to use it.
Assuming good collimation and tracking, the greatest contribution to these hi-res images is, in my opinion:
Sharp focus
Excellent seeing
Even though we have enjoyed 3 to 4 days of excellent seeing in Brissie, I notice that the portion of the image where I place the Registax “Align Square” often comes up sharpest with other parts of the image slightly softer. This ties in with the observation that as I acquire the avi, the on-screen image on the Notebook computer is “swimming” as areas slowly drift into and out of best focus, as the waves of seeing pass over the image.
Hope that makes sense.
Dennis