Quote:
|
Originally Posted by A95_sucka
If these images were taken handheld, imagine how much sharper they would be with the use of a tripod or the camera otherwise steadied (props, balancing on a sloped surface, etc.)...
|
Heh. The moon races across the sky at a heck of a lick. I did a tripod shot of the moon with slide film once. I reckoned on a 10 minute exposure to illuminate the landscape as well. The moon turned into a long cylinder because over the course of 10 minutes it had moved so far. It must have moved 3 times its width over those 10 minutes.
The moon is 3,476km in diameter and travels at a speed ranging between 0.968 km/s and 1.082 km/s. The average is 1.022km/s
This all means that by the time a 1/60th exposure is completed, the subject has moved (1.022km/s / 60 =) 17 meters. This is not condusive to sharp images.
In terms of the angle that the moon will move in 1/60th of a second, I suppose it is minimal unless one uses a long-range lens. I once viewed the moon through an astronomical telescope and it moved so fast it was hard to keep up with - especially since the telescope was calibrated for steller motion and not lunar.
For more moon information, please view this webpage
Lunar data