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Old 17-01-2020, 04:18 PM
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Merlin66 (Ken)
Spectroscopy Wizard

Merlin66 is offline
Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 8,442
As Jon says, it's 6.5mm from the T thread body connection.

The mating thread on the corrector is M56 x 0.75 - Ideally a 50mm spacer with female M56 on one end and a female M42 T thread at the other.
Don't know where you'll get a "special" like that......
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