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Gday Ken
There was huge traffic on this on the Yahoo websites many years ago.
Initially, people thought 3.3 reducers had been sold as 6.3s, but later testing showed Meade had indeed changed the formula for the 6.3.
No idea on the details, but there was definitely a design change done somewhere along the line that massively reduced the backfocus. Many users complained that the new spacing made the new short FL reducers impossible to use in their existing setups.
Andrew
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