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Should have read the blurb better first! Might be worth a look if I need to.
" Addition of the RCC-I into the optical train extends the focal point slightly (approximately 5mm, in an f/4 system). This important attribute ensures that your system will be able to reach focus without needing to shift the primary mirror or increase the size of the secondary mirror (of course, this assumes your system will already reach focus without the RCC)."
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