: 150mm Milky Way Reveal Focus Filter : Electronics. Reveal 150mm 。 Description A new 6″ version for those with a really wide lens or a 150mm filter holder. This filter is huge and works well. No slots for adjusting with screws. How do I focus for night photography on stars? How it works: The Goal of the Reveal Focus Filter is to create six spikes (really there are three spikes that pass through the star but if you are counting them one-by-one I don’t want you confused) on bright stars. There is a main large spike then an X of four smaller spikes. The goal is to get the main large spike centered between the X and centered on the star itself. As soon as that is done BOOM you have perfect focus in as little as 2-3 seconds. 。 。 。
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