If I add a ED Barlow to my achromat refractor will it remove the blue halo? Dale
ED Barlow
Started by jumpingjackflash1960, 01/26/2007 02:50PM
Posted 01/26/2007 02:50PM
Opening Post
Posted 01/26/2007 03:26PM
#1
Dale,
Adding an ED barlow won't remove the blue halo but adding an 81B photographic filter will do the trick.
Adding an ED barlow won't remove the blue halo but adding an 81B photographic filter will do the trick.
Posted 01/26/2007 07:43PM
#2
Dale Smith said:
If I add a ED Barlow to my achromat refractor will it remove the blue halo? Dale
No, as noted. There is an optical devise called a Chromacor that will do a pretty good job of what you want (can alos be ordered to help over or under correction of the achromat lens). Never used one, and they are pretty expensive, but created a good buzz here a few years back.
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