Can anyone recall the technical difference between these two models of filter wheel? I'm looking to get a second hand unit to replace my failed CFW-8A and am wondering if CFW-8 and CFW-8A are compatible with my ST8-XME. From software perspective it seems both CCDOps and TheSkyX only give the option "CFW-8" no "CFW-8A" so I presume they are somewhat compatible? Thanks, Roger.
