Considering that an 8" f/7 Chief with a right angle arrangement of the mirror before the lenses is only as tall as an 8" f/6 dob and has considerably better spot diagrams than an 8" f/6 Chief, I'm hoping you guys find someone willing to turn out a batch of 8" f/7 or longer.
I'm in the midst of a major water jet programming project at work for a product launch that has brought all hobbies to a screeching halt for a bit. I worked seven days last week and will work at least six days this week.
I'm hoping to show soon my idea with proof of concept prototypes for making lens cells in a manner that should easily make it possible to adjust to different prescriptions for tilt, spacing, and Y offsets.
I know it sounds like more than a garage workshop could do precisely, but I'm confident a combination of two tricks will make it quite possible to stay well within the tolerances Mike and Ed are designing to for the cells.
I think the printed cells Ed designed are still the best idea for a standardized design for those without the tooling experience and equipment to go the route I'll try, but I'm confident that at least two of you on this group build could duplicate my efforts.
This should help the one-offs for the unique mirrors a few of you already have or are making, as well as to help builds of homemade mirrors whose focal lengths are a bit off target. I do recognize, though, from the tolerance studies done so far that these designs can suffer a bit of range of primary focal length.
Edited by jtsenghas, 25 September 2020 - 08:16 PM.