Bob diagonally parked in a parallel universe...
Quote:Hi Mark, extremely interesting, this also means that the newer high speed cameras with smaller pixel sizes drive down the optimum focal length so not really suitable when attempting for higher resolution long focal length imaging?RegardsAndy
Quote:Thanks for that Mark. Very interesting. I ran the numbers on the 152 (900mm focal length) and my camera, and the minimum Barlow I should be using to not undersample is 2.4x, which seems about right to me as I use a 2.5x powermate by default and reckon I could push it to 3 or 3.5x on a good day (though I suspect such days will be rare here in Perth). When I had really good seeing in Oman I could use the 3.5x barlow on the same scope for CaK and that seemed about as far as I could ever expect to go given the susceptibility of that wavelength to poor seeing.
PGR-Chameleon WO Binoviewer, 20mm ep's, 2x ultimate Barlow WO-GTF-81! C102 GT Sears no. 4-6339-A Jason Equatorial Refractor-SYW Jason 313-circle T, EQ mount Solarmax II 60 mm,BF-10 Vixen Porta mount, CG-5GT 10 x 50 & 7 x 35 Bino. UO ortho's 6,7,9, ES-82- 4.7,6.7,8.8,11,14, ES-68-24,TV-Radian-3,
Observing the Sun with complex optical systems since 1966, and still haven't burned, melted or damaged anything. Not blind yet, either!