I recently started a thread on the SSO Forum where is shown the first view on this attached here.
Extract “... picking Mercury up in the 16.3” much of the aperture was destined to be masked by the fence so rather than endure a slowly increasing irregular ‘triangular’ aperture I applied the 6” off-axis mask.
Still much atmospheric dispersion at that time but as usual this was nicely countered by the orange #22 filter (a #21 is almost as effective).
Went to full aperture as it cleared the fence: just at the point when the rising sun seems to whip up some turbulence. BUT...time and again I have found that there is often a marked settling a little while after sunrise; then after some 20-30 minutes a more serious breakdown – often sudden...
As mentioned there the initial view was with the 6” Off-Axis mask on the D-K + #22 filter: and yesterday morning another, and better, view with that setup.
Alas this time thick fog came up as the sun climbed – so no full-aperture view. But that first view of yesterday is shown here below the full aperture one from Sept 19; and it was at that point that the seeing was near perfect....
This had been a night of improving definition with marvelous views of all sorts in Orion after a rendering of the Lynx Intergalactic Wanderer globular – to follow here.
Edited by David Gray, 23 September 2017 - 02:25 PM.