Homemade 'scopes 8"f/7,6" f/5", 6"f/4, 4.25" Schiefspiegler,60mm Coronagraph,60mm H-alpha system, 4.25" White-light Solar Newtonian,solar spectroscope, 4" f/12, 4.5" f/16 & 6" f/12 Schupmann Medial refractors, 4" Celestar, 19 Stellafane awards 9 in optics Engineering = Taking what you have and making what you need.
Quote: When optimising for spherochromatism the only way to shift the neutral zone from the origin out to 0.707 of corrector radius is by making surfaces also weakly curved. But this information will not feature in calculating the deflection when polishing the plate with a vacuum pan - input to the formulae is via the A + B coefficients only.Is this why vacuum pan method needs spherical tool and does it end up the same shape as OSLO ray trace model?I have not seen this position of neutral zone mentioned in the calculation of sagitta of tool or deflection.
Quote:Is the optical effect of the curve 'contained' within the coefficients by virtue of their values having to change to retain the minimum wavefront error?
Quote:Setting the Rv first for 0.707 or 0.868 zone has me puzzled just now. From where is this derived if OSLO cannot be left to optimie it?
Quote: However, since the amount of secondary spherical at its best focus is 2.6 times smaller than at the paraxial focus - which is the focus of correction for secondary spherical ...
Quote:For systems f/3 and slower, as Vla already mentioned, the 5th order SA is usually so small that it can be ignored
Quote:Is there one available for Baker's Reflector Corrector in ATM III?