Orion XT8, Celestron 102mm f/10, 62mm Mayflower
10x50, and 16x32 binos
Nothing would be done at all if one waited until they could do it so well that nobody could find fault with it.
Quote:...anyone with a 8" f6 what is the highest mag you have used, (with good seeing) and maintained clarity?
You know you are there when you start thinking in terms of EXIT PUPIL rather than Magnification..
Quote:Normally they say you rarely use 300x+, but I do with my 17.5 f4.1. I only use my 3.5xmm Ethos on Globular clusters, and only use my 2.3mm on Uranus and Neptune to blow up their disk and confirm it's a planet.
David W. Knisely . . . . . . "If you aren't having fun in this hobby, you aren't doing it right." Hyde Memorial Observatory http://www.hydeobservatory.info Prairie Astronomy Club http://www.prairieastronomyclub.org
Quote:To understand how the highest useful magnification is derived, think in terms of exit pupil. The exit pupil is the interface between the objective and eye. Its diameter controls image surface brightness and the visibility if diffraction effects. Diffraction imposes the ultimate on resolution, and its effects generally become visible at about a 1mm exit pupil
Quote:Is there a certain time of night when skies, in general, tend to be the calmest overall?
Quote:2. Surface turbulence extends from the ground up to a few hundred meters in the landscape around the telescope, which when viewing at a zenith angle above 60° is within half a kilometer of the observing site. Surface turbulence often represents up to half of all the observed optical distortion; it is largely due to convection currents rising from heat stored in the sunlit earth during the day. Particular concentrations of convection currents can arise from nearby residences, paved roads, surfaces of masonry or concrete, commercial buildings, and from turbulence between low lying layers that form temperature inversion boundaries. At many locations, surface turbulence follows a diurnal cycle from a minimum just after sunrise, steeply rising to a peak during early afternoon, declining to a secondary minimum shortly after sunset, increasing during the early evening to a secondary peak at around midnight, before returning to a minimum in the hour or two before morning.
Quote:Best way to move floaters out of your field of view is to quickly look up, then down, not side to side. My ophthalmologist told me that a few years ago and it works.