As you may or may not know, on the 5th of June, we will be able to witness a once in a lifetime event, which occurred only seven times since the age of Galileo Galilei; the next time Venus will pass in front of the Sun will be 105 years from now, in 2117. Th&e transit of Venus in 2012 will begin at about 3:09 p.m. PDT (6:09 p.m. EDT or 2209 GMT) and will last about 7 hours, as Venus crosses the entire face of the Sun. Observers all over the world will be able to catch a glimpse of the phenomenon, although for some it might be at an uncomfortable hour. But how can you safely photograph this event? A few basic measures should be taken.
Filter and protection
First of all, you should definitely protect your eyes and your equipment using a proper visual filter to cut down the Sun’s brightness. The best would be a No. 14 welder’s glass filter, but if you can’t afford that, other adequate filters will do as well.
Use a telescope or a telephoto lens
Of course, only for those who want a profi touch to their pictures – a telescope or telephoto lens isn’t something that grows on every fence. You first have to decide what you want to capture – the whole disk of the sun with the tiny pitch-black silhouette of Venus in it or close-ups of the ingress (entry) or egress (exit) of Venus’ disk along the edge of the Sun and record the so-called “black drop” effect.
Check your focus
When you’re aiming for the stars, focus is a must – and if you can get away with a slight lack of focus on some pictures, this time, failure is not an option.
The more pixels, the more quality.
Fore more and more detailed tips, check out this excellent post over at Space.com.