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Jan 13, 2016 at 20:26 comment added user13451 @Whelkaholism that's when you start going to things like the selective spot star filters that Lee makes (I tend to use the Lee system so I'm a bit more familiar with them). They do tend to be on the higher end of the 4"/100mm filters that are available.
Jan 13, 2016 at 16:41 comment added Dan Is Fiddling By Firelight If you want to try a getto DIY option, you might be able to get that sort of effect by crossing 2 or 3 pieces of thick thread/thin string across the face of your lens. The source of the diffraction spikes that filter is creating in images taken by telescopes comes from the spider veins that are used to hold a secondary mirror in front of the primary. Since they're pieces of sheet metal edge on to the light path, string would simulate their impact directly.
Jan 13, 2016 at 10:18 comment added Whelkaholism Consistent etching is not really a problem, in fact inconsistent etching may give a more natural effect as the starbursts will be different across the frame. You can actually get a reasonable starburst effect with a kitchen sieve. The main problem with starburst filters is they make all your photos look like they were taken in the 80s :)
Jan 13, 2016 at 0:35 comment added user13451 Quite a few companies make star effect filters. I tend to doubt that an individual would be able to etch it well and consistently - not impossible, but given that I can get a high quality 6x or 8x filter for significantly less than I value half a day's work at...
Jan 12, 2016 at 16:16 history answered Paul Austin CC BY-SA 3.0