[alpal]

Originally Posted by MrB

3" Keller corrector from ASA.
http://www.iceinspace.com.au/forum/s...ad.php?t=64882

Thanks Simon,
That explains it - a superb corrector:
http://www.optcorp.com/product.aspx?pid=11488

& even though the short back focus of 57mm would most likely preclude an OAG
being used the separate guide scope seems to have no flexure.

That is a really nice result with 15 minute subframes.