Astrophotography: which lense is the best?
This forum is kind of dead most of the time. Since you own the K-5, you really should be asking your questions in the Pentax SLR Talk Forum. There are many folks over there that can and will answer your questions.
Ron - 'We don't have time to go take pics this afternoon Carl.'
Carl - 'What do you mean? It will only take 1/1000s.'
'Keep your eyes looking forward. However, glance back now and then to see where you've come from. It will put a smile on your face.' ~ brandrx