Got myself a lens with decent magnification (mto 11ca 1000mm) and could finally take generic pic of full moon. Not too sharp since manual focussing is a pain with this thing. :
MC MTO 11CA 10/1000mm Mirror Lens mount M42 No.952412 | eBay
EOS-M with a MC MTO-11CA soviet 1000mm lens (F10) : r/canonmseries
MTO Lens Question - PentaxForums.com
Maksutov MC MTO-11CA 1000mm F10: A review – Aquilaa
Maksutov MC MTO-11CA 10/1000mm Zenit-e SLR Camera - Etsy