Orion’s progress westward is marked by the poles holding the wires for the Cathcart Circle at the bottom of our garden. These were 3 minute exposures at ISO 3200 with an 18mm lens (not telephoto, and no telescope) at 21:26, 21:34, and 21:40 last night.
The difficulty is you can’t see anything in the viewfinder, or the live-view screen until after the 3 minute shot is complete. The graininess and red dots are noise and camera sensor artifact I think, which are particularly bad at high ISO but I thought 3 minutes was quite long enough. I could probably have improved the grainy and dotty outcome by subtracting a ‘dark frame’ – but I forgot to take one. The image below is the sum of the other 3 after aligning them by Orion’s stars, so you can see the poles are spread out. Although no telescope was involved its equatorial mount did a great job by tracking the stars as the earth continued to spin – so no discernable star-trails I think which you would certainly get with a 3 minute exposure from a static tripod. Light pollution is reduced by a serious Astronomik CLS CCD light pollution filter – else the sky would be orange.
Next stop, the solar eclipse. Don’t look at the sun without some Sky at Night Solar Eclipse Glasses like mine.