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Old 22-06-2020, 02:00 PM
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Merlin66 (Ken)
Spectroscopy Wizard

Merlin66 is offline
 
Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 8,017
Barry,
The 44mm is correct.
To use and focus a Canon lens on a CCD/ CMOS camera you need to achieve this spacing. Any spacers, filter wheels etc, must therefore fit within this space.
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