Quote: I'm sure Celestron's opticians could figure that out,
A 60mm department store refractor started it all....
Bob diagonally parked in a parallel universe...
Quote:Schott N-BALF5 instead of N-BALF2, which seems to be pretty elusive.
Quote:In their 'White Paper' on the EdgeHD telescopes, Celestron states that the 14 inch EdgeHD corrector uses N-SK2 and N-BALF2 glasses. So yes, it seems to exit.
Quote:I tried to google N-BALF2 but found nothing. And here is C8 EHD prescription in book. The mirrors system is f/8.5 if you remove corrector. I wonder why using corrector to increase focal length.
Quote:we optimized the design for the largest possible field of good correction.
Quote:That makes me think the original design was targeted more at highest performance in the center, for planetary and visual work, while reducing the Strehl farther out. This is consistent with the white paper, which makes the point that deep sky imaging is seeing limited.
Quote: I was wondering if it would be possible to design a CDK 350 mm F3-12 optimised for high resolution, with a 30% obstruction, and a flat diffraction limited field of say 7 arcmn in diameter, from 350 to 800 nm ?
Quote: I have been playing with the two OSLO models Vla derived for the C14 Edge-HD:
Quote:Has anyone explored design of a lens corrector system similar tho the Edge HD for the standard Celestron SCT designs which could be located in the OEM primary baffle tube? Could these be modeled in the OSLO edu version?
Quote:The 5mm closer overcorrects blue <spots> wrt book and undercorrects red.The 0.866 corrector null undercorrects the blue <spots>
Quote: is there a way to display the Strelh ratio accross the field with OSLO-LT ?