Interested in the recommendations given here. My question is: is a DZ/DL better color corrected then a FS scope(I used to own the FS-128)?
There is no visual difference between my Tak FC (Steinheil design) and my Tak FS (Fraunhofer design) aside from brightness. Both are f/8 and the only difference aside from aperture is the position of the fluorite element.
What I like the most about these two scopes is their weight. Both of these scopes replaced similar-sized triplets and both of them are much lighter and easier for me to handle than their predecessors.
Having said that, Tak has reduced the tube diameter of the new FC series scopes and they are even lighter than my older FC-100. I think any of the new FC-100D series (DC, DF, DL, or DZ) would be a great choice for a new 4-inch refractor. I owned an FC-100DC before I found this older Tak and it was a superb scope.