Reducer/Flattener and an ES ED102

[Collin]

Hello all. I was a visual-only observer about 20 years ago. Gave away what little I had because a) I'd outgrown it anyway and b) I wanted to stop a relative from buying something that would have destroyed his interest in the subject. Y'know, a magnifying glass on a twig. Then of course, life got in the way and I'm only returning to astronomy now. This time I intend to image    

if you're still reading - thanks

Anyway, I'm struggling with something. I'm building my system slowly but seem to have gotten a bit stuck finding a reducer/flattener for my scope An Explore Scientific ED102 with a 2" unmodified focuser. Not hexafocus or crayford - just stock. 

I'm trying to make the image train as square and rigid s possible, so I'm trying to find a reducer/flattener that can be screwed at both interfaces. I don't know if such a thing exists - what hinders me greatly is that I don't know all the relevant thread sizes and I don't know what you can and can't do. (Seems there's quite lot I don't know)  

I'm looking for either a 0.7 or 0.8 reducer/flattener. Then my biggest question will relate to precisely where in the image train to put it (I suspect the dreaded Youtube will tell me that) Behind it I intend to put the ZWO OAG, an ASI294 and an ASI290 mini for guiding.

If anyone has the time to give me some pointers, I'd be very grateful.

Regards,

 

Collin