|
was actually just pleased someone was looking 
Yes, a tripod is essential! I also use a time delay, so the shutter doesn't open until 2 secs after I press the release. That eliminates the immediate handshake of operating the camera. For wide angle shots, an exposure of 15 seconds gets good results. With 12 x zoom that is far too long because the sky moves. Much more than one second exposure will leave visible tracks on the stars at that zoom. However, that does depend on the distance of the stars from the North celestial pole. Orion is on the celestial equator, so its stars cover a significantly greater distance across the sky in 15 seconds than, say, those of Cassiopeia or Ursa Minor.padfield wrote:
Guy
Shutter. What shutter?padfield wrote:I also use a time delay, so the shutter doesn't open until 2 secs after I press the release.
Good maths, Jack! Go to the top of the class! Around full moon, in winter, the moon behaves like the sun in summer, spending more than 12 hours above the horizon, so your plan might work. The phase difference would, I think, be significant, but if this were a long-term project you could wait several lunar cycles until the same phase occurred at the appropriate time.Jack Harrison wrote:If from a fixed location, the Moon were photographed just after rising and then just before setting, you could get a much bigger baseline. At Earth’s equator, this would be around 12,000 kilometres. But at higher latitudes, eg Switzerland or Britain, the baseline would be less (Guy – by a factor of cosine latitude???)
