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hoya filter question

  • From: "phillip geller" <filje@xxxxxxxxxxx>
  • Subject: hoya filter question
  • Date: Tue, 11 Apr 2000 11:12:27 -0500
is the Hoya R72 the equivalent of an 88 or an 89b?
The number would suggest that it is approximate equivalent
of Heliopan RG 715.
Can you observe the  Wood effect directly with it on a sunny day?
Phil

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