Thanks Andy and Mike! Mike, how big is the sensor on the PL16803? Can you mount Canon lenses on it? If so, the Zeiss 135mm f2.0 APO is truly a rocking lens! Has quite a long focus through that helps for finer adjustments, but if you're aiming overhead, the focus may slide. I use rubber bands to solve that problem. Using straight luminence at f2.5, you will blow out the background sky at 180s. Even shorter for a monochrome cam. So you bang out heaps of short (90s) subs. The lens is so dangerously sharp that it tears a 20mp bayer senser to shreads - even with the AA filter in front of the bayer colour filter array. It would resolve 100mp+ if those pixels were available
It would find a good mate with a good monochrome sensor if there's room for the filter wheel!