Quote:
Originally Posted by Emuhead
Thanks for the fast response Greg. I have spent a fair amount of time on the old astrobin checking out what these & other scopes can do, and its a great resource for sure.. even have my own little page on there.
So all 5 of those have FPL-53 glass as it goes, and im sure all have pretty decent focusers (some rack & pinion, some not). I am ever so slightly leaning toward the 120mm but can i shoot at f/7, or will i have to spend the extra to get the x0.65 reducer which will end up netting me what could essentially be a very expensive Esprit 100ED (more or less). |
FPL53 doublet probably is quite good but really in my experience you really want the triplet. Doublets are really non APO but are called APO for marketing.
Even Tak doublets are going to fall short for imaging. I had a high end Tak FS152 fluorite doublet and it was superb visually but for imaging it tended to get false colour on brighter stars - a blue ring, which is the usual thing you see with non APO scopes.
The Esprits though seem pretty good for imaging.
Greg.