1. Image is extremely out of focus. 2. Image is brought closer to focus. 3. Image is almost focused. 4. Image is now focused. 5. The image has now been gone past perfect focus and will have to be brought back in focus by adjusting the focuser in the opposite direction. 6. The image is back in focus. At this stage the image needs to be zoomed in to to check this is really the best focus you can get. The star points should be small and have the small peaks of the triangle just appearing at the dots three corners
Nejhustší část oblouku se lépe pozoruje, když je co nejvýše nad jižním obzorem. Proto na severní polokouli obecně platí, že v dubnu a květnu je ideální doba před východem Slunce, od června do srpna kolem půlnoci a od poloviny srpna do září těsně po západu Slunce.
Bristlecone Pine Star Circle *Explored* Steven Christenson
Steven's Tree and Star Circle (19 exposures, 8 minutes each ISO 100 so a total of 2 hours and 32 minutes). First exposure was at 10:53 pm, the last at 1:18 am. Long exposure noise reduction OFF. f/4, 23mm.