|
Dennis, you're on the right track.
For optimum definition on this "type" of method you need to be able to freeze the atmospheric seeing, so this normally means a very short exposure say 1/100 sec, obviously then we need to use brighter stars. Also the image HAS to be exactly focussed, so there's a two stage approach
- find the minimum image size ( diam) ie in focus
- measure the light distribution ( accuracy of optics etc)
There's a freeware package called Reduc which can be used to assist ( it's really for double star measuring.... but a very similar issue).
|