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I was discussing the use of an Achro last week at the astro club and someone said they do it with a violet 30 filter There were some other letters in there but my skatty mind has reduced the info to V30 M - which may or may not be correct.
He did however say that his pics are well beyond beginners photos and not to be sneezed at and he is a very well respected member of the club.
So his comment may be translated as - close to but not alongside ED.
Personally I think it may be a great idea and I'll try a filter on my achro before I scoff too loud at the idea and extend my wallet to an ED or APO
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