I’ve tried for years to create the effect of fuzzy haloes around stars to pop out the brighter stars and make the constellation pattern more obvious. It’s the “Akira Fuji” effect, named for the ace Japanese astrophotographer who has long perfected the technique with beautiful and widely-published results. I’ve tried various soft focus and diffusion filters, scratched UV filters, vaseline-smeared filters, breathing on filters, etc., etc. None have worked well. Till now.
The Kenko “Softon” filter offered by Hutech Scientific works fabulously well! It’s a tough filter to find in local camera stores here — but Hutech sells it. And it really changes the way I do constellation shooting, making any previous shots obsolete. I take several shots without the filter then one or more of the same exposure with the filter in place. I stack the two types of exposures in Photoshop, with the fuzz-filter layer blended with a Lighten mode to a varying opacity to “dial in” the level of fuzziness that looks good. Too much and it looks overdone and fake.
The technique also pops out the star colours, like here on red Betelgeuse amid the blue-white stars of Orion. This was from January 2011 from my backyard and is a stack of four 5-minute exposures w/o filter and one with. All with the Canon 5D MkII and 50mm Sigma lens, a terrific combination for constellation portraits.
– Alan, January 2011 / Image © 2011 Alan Dyer