Willmann-Bell shutting up shop is a sad development. The AIP4WIN software, which accompanies Richard Berry’s book “Astronomical Image Processing”, has been used by many people for photometry. The second edition, including AIP4WIN version 2 software, has been out of print for many years. According to Willmann-Bell, they are making a non-registered version available from their website, specifically stating “AIP4Win2.0 No Longer Requires On-line Registration”. Richard Berry comments in an AAVSO forum that it is now essentially freeware.
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