Quote:
Originally Posted by Slawomir
Hi Dave,
Since MN190 has a rather small 22mm fully illuminated circle (according to Orion/SW), I would go for a quality refractor. My 105mm refractor has a 44mm fully illuminated and corrected circle, and a 130mm refractor will most likely have a 55mm fully corrected circle. Having said that, a 22mm illuminated circle should be sufficient for KAF8300.
I believe a refractor would be more versatile, because you could image for a greater detail with just a flattener, and one day invest in a quality reducer and have a wider field with a faster f-ratio. I'm not sure if a reducer can used with MN190 
MN190 and 130mm f/7 refractor when combined with KAF8300 will both have very similar image scale.
One more thing, I'm not sure how cooling times and backfocus compare for both designs. |
Thanks for your thoughts. A tick in the box for refractors, I doubt very much that I'd enjoy gathering photons at native F7 though.
With a reducer yeah it's much more doable.
No the Mn 190 can't be used with a reducer but it's fast enough anyway. This scope choice will probably come down to ease of use as my future rig will be portable. Having owned one ,I've seen first hand what a Mn190 can deliver , so finding it difficult to switch to a frac, but they would be an easier option for a portable rig.