Good Morning,
I feel your pain. Friday afternoon, I drove up to Sedona (a dark sky city/town) with a list of things/locations I wanted to try to shoot at sunset, night and at sunrise. I know and understand the limitations of Pentax and I do have some fast glass for the task (Sigma 18-35/f1.8), and also use the GPS unit. I do try to choose simple compositions to shoot - with lighting situations that tend to help. I also, try to pre-focus the lens in the early evening to infinity and tape the focus ring down (that doe help, but when you adjust the focus length, that does not necessarily guarantee that you will retain your previous focus). Having said all of that - it's still painful.
- I ran in to a couple who were chasing the Milky Way. It was their last night in town. They had a Nikon D750 with a 14-24/2.8. He was able to AF on the stars and just shoot. Amazing. We talked for a while, I gave them a list of locations I had worked out with google earth, and they were off with their Hertz GPS. He was telling me about a fire road that he came across the previous night, that had the MW standing on end at the end of it (highway to the stars).
- Later Friday evening, I drove up to a bridge in Oak Creek Canyon to check out some ideas I had. There was another gentleman there shooting the city lights of Sedona (at the bottom of the canyon/valley) with the Milky Way over head. We talked for a bit while he was shooting. I mentioned that I had seen an image of the Brooklyn Bridge, where it was shot from underneath, with the city lights lighting up the beams of the structure. I was thinking that the early morning twilight might supply enough light for me. He somewhat excitedly scoots to his truck and pulls out a light and says, let's go try something. So, he has this amazing old army surplus flashlight that lit up the entire bridge structure (across the whole canyon) in an amazing way (lots of diffused light). We wound up each shooting the bridge for the next 3 hours. He was shooting time lapse Milky Way shots (Canon 5DIII and 5DS) - bridge in the foreground, city lights in the background - through the bridge structure, car headlights coming up the canyon road, with the Milky Way standing on end at the head of the bridge - Fantastic!. I couldn't even start to do a fraction of that - I was struggling to just get focus. I had to wind up choosing a fast lens (the 18-35, with stitching) or a much slower (8-16) to get the entire structure, with out any flaring (from the headlights) - with a much higher ISO (as in 10000 to 51200 - although I did manage get some at 1600 to 3200). It was a constant struggle. Problem solving on the fly, just to get some basic shots, that captured a scene - that I did not anticipate having access to.
It turn out this guy is an asst prof up at NAU in Flagstaff (teaches photography), shoots for the BBC and NatGeo - and is currently doing an assignment for the IDA, the group that certifies/promotes dark sky cities/towns - (Flagstaff,AZ was the first one, Sedona is the sixth one). He is going around to each of the areas, shooting the stars/MW over the city, town, area, etc. His main focus is complex compositions that show that with proper low lighting, towns can actually have the streetlights, and access to seeing the stars. He started over in Europe, then the east coast, and now here in AZ. Had some wonderful MW shots of the North Rim of the Grand Canyon. He was on his way down to Tuscon, Kit Peak, White Sands, then on to the big island of Hawaii.
So the moral of the story is to choose your subjects/areas and lighting carefully. Not once did any of the folks try to promote either C or N. They were just helpful and interested in trying to capture the light. I continually learn, and find different approaches (I gotta find one of those flashlights). I do hate to change lenses, once I get stuff in focus. Pentax can do a great job - when it's put in a position that it's capable of capturing (and that is what I am constantly trying to find). My K5IIs is still more camera than I have skill. My problem is throttling back the ideas/situations that exceed both my skill and the camera's capability. Do I wish that Pentax would hurry up and get some really low light AF - absolutely!!!