Quote:
Originally Posted by Lee
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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I needed to move my mirror up by 65mm to get the RCC1 to work. The focal plane does not move by much when you put the RCC1 in, but your scope needs to be able to focus a long way out from the OTA in the first place - the standard scopes don't. The focal plane height above the OTA surface needs to be (roughly) the length of the RCC1 plus the RCC1 backfocus distance of 91.5mm. The secondary needed to be at least 70mm diameter with the new mirror position - slightly bigger would have been better.
When I was using the MPCC, it just slotted in and worked straight off without an scope mods, which was a lot easier