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amateur astronomer found blown to pieces, double-stacked PST found nearby
What the subject line said.
I already had an SM40 from, oh geez, probably almost a decade ago, so from what I'd heard, it made sense to buy a PST to double-stack the SM40 on it. Oh yes. The detail is really quite something--just about the best I imagine you could get from a 40 mm scope. With just the PST, there's a lot of scatter in the image, which reduced contrast; with just the SM40 on my Ranger, the details were there, but not as distinct. The two of them put together made the Sun fierce and unsubtle. A few caveats: The PST comes with the 5 mm blocking filter; I bought my SM40 with a 10 mm blocking filter, so the PST had a bit more vignetting than I was accustomed to. There is no way (as far as I can tell, at least) that one can replace the blocking filter in the PST. The PST comes with a helical tuning ring; the SM40 comes with a small tuning knob. These are adjusted together to tilt the two filters so as to obtain the best image. I think they tilt along the same axis, because there's a kind of linear vignetting that (in my case) goes diagonally across the field of view. Still, for only an extra $500 or so (I bought the PST at PATS in Pasadena, and got the case thrown in as a freebie), it's a fantastic deal. -- Brian Tung (posting from Google Groups) The Astronomy Corner at http://www.astronomycorner.net/ Unofficial C5+ Page at http://www.astronomycorner.net/c5plus/ My PleiadAtlas Page at http://www.astronomycorner.net/pleiadatlas/ My Own Personal FAQ at http://www.astronomycorner.net/reference/faq.html |
#2
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amateur astronomer found blown to pieces, double-stacked PSTfound nearby
On Sep 19, 7:00*pm, Brian Tung wrote:
What the subject line said. I already had an SM40 from, oh geez, probably almost a decade ago, so from what I'd heard, it made sense to buy a PST to double-stack the SM40 on it. Oh yes. The detail is really quite something--just about the best I imagine you could get from a 40 mm scope. *With just the PST, there's a lot of scatter in the image, which reduced contrast; with just the SM40 on my Ranger, the details were there, but not as distinct. *The two of them put together made the Sun fierce and unsubtle. *A few caveats: The PST comes with the 5 mm blocking filter; I bought my SM40 with a 10 mm blocking filter, so the PST had a bit more vignetting than I was accustomed to. *There is no way (as far as I can tell, at least) that one can replace the blocking filter in the PST. *The PST comes with a helical tuning ring; the SM40 comes with a small tuning knob. *These are adjusted together to tilt the two filters so as to obtain the best image. *I think they tilt along the same axis, because there's a kind of linear vignetting that (in my case) goes diagonally across the field of view. Still, for only an extra $500 or so (I bought the PST at PATS in Pasadena, and got the case thrown in as a freebie), it's a fantastic deal. -- Brian Tung (posting from Google Groups) The Astronomy Corner athttp://www.astronomycorner.net/ *Unofficial C5+ Page athttp://www.astronomycorner.net/c5plus/ *My PleiadAtlas Page athttp://www.astronomycorner.net/pleiadatlas/ *My Own Personal FAQ athttp://www.astronomycorner.net/reference/faq.html Brian,what am I going to do with you and the rest,here is another one from your FAQ that needs serious attention as there is a modification involved - "What it is, actually, is the Earth's rotation. If the Earth didn't rotate, then all the stars would stay in place, and observing the night sky at high power would be easy. Of course, day and night would last about 4,380 hours each, leading to baking temperatures during the day and way below freezing at night." Tung Now Brian,if the Earth didn't have a daily rotation,the stars would move as there is a separate daylight/darkness cycle arising from the orbital motion of the Earth with a traveling axis which runs North to South through the center of the Earth from Arctic to Antarctic circles,that rotation to the central Sun is about to turn the polar coordinates through the circle of illumination.It is that motion which causes the constellation Orion to disappear from the celestial arena each year and if you have difficulties,there is always the imitation analogy using a broom to substitute from the polar coordinates and a fixed external object to maintain a focus for how the Earth turns 360 degrees in a period coincident with the orbital cycle of the Earth to all stars including our central Sun.While this orbital component is largely obscured by daily stellar circumpolar motion,the principles of the polar daylight/darkness cycle as a window into this motion is beyond doubt,either that or check the East/West component of Uranus http://www.daviddarling.info/images/...gs_changes.jpg Can I not trust you to modify your FAQ to take into account what contemporary imaging is dictating so no Brian,if the Earth didn't rotate the stars would appear to move and in 365 days 5 hours 49 minutes they would move in a complete 360 degree cycle,if they didn't you would have big problems. |
#3
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amateur astronomer found blown to pieces, double-stacked PST found nearby
"oriel36" wrote in message ... On Sep 19, 7:00 pm, Brian Tung wrote: What the subject line said. I already had an SM40 from, oh geez, probably almost a decade ago, so from what I'd heard, it made sense to buy a PST to double-stack the SM40 on it. Oh yes. The detail is really quite something--just about the best I imagine you could get from a 40 mm scope. With just the PST, there's a lot of scatter in the image, which reduced contrast; with just the SM40 on my Ranger, the details were there, but not as distinct. The two of them put together made the Sun fierce and unsubtle. A few caveats: The PST comes with the 5 mm blocking filter; I bought my SM40 with a 10 mm blocking filter, so the PST had a bit more vignetting than I was accustomed to. There is no way (as far as I can tell, at least) that one can replace the blocking filter in the PST. The PST comes with a helical tuning ring; the SM40 comes with a small tuning knob. These are adjusted together to tilt the two filters so as to obtain the best image. I think they tilt along the same axis, because there's a kind of linear vignetting that (in my case) goes diagonally across the field of view. Still, for only an extra $500 or so (I bought the PST at PATS in Pasadena, and got the case thrown in as a freebie), it's a fantastic deal. -- Brian Tung (posting from Google Groups) The Astronomy Corner athttp://www.astronomycorner.net/ Unofficial C5+ Page athttp://www.astronomycorner.net/c5plus/ My PleiadAtlas Page athttp://www.astronomycorner.net/pleiadatlas/ My Own Personal FAQ athttp://www.astronomycorner.net/reference/faq.html Brian,what am I going to do with you and the rest,here is another one from your FAQ that needs serious attention as there is a modification involved - "What it is, actually, is the Earth's rotation. If the Earth didn't rotate, then all the stars would stay in place, and observing the night sky at high power would be easy. Of course, day and night would last about 4,380 hours each, leading to baking temperatures during the day and way below freezing at night." Tung Now Brian,if the Earth didn't have a daily rotation,the stars would move as there is a separate daylight/darkness cycle arising from the orbital motion of the Earth with a traveling axis which runs North to South through the center of the Earth from Arctic to Antarctic circles,that rotation to the central Sun is about to turn the polar coordinates through the circle of illumination.It is that motion which causes the constellation Orion to disappear from the celestial arena each year and if you have difficulties,there is always the imitation analogy using a broom to substitute from the polar coordinates and a fixed external object to maintain a focus for how the Earth turns 360 degrees in a period coincident with the orbital cycle of the Earth to all stars including our central Sun.While this orbital component is largely obscured by daily stellar circumpolar motion,the principles of the polar daylight/darkness cycle as a window into this motion is beyond doubt,either that or check the East/West component of Uranus http://www.daviddarling.info/images/...gs_changes.jpg Can I not trust you to modify your FAQ to take into account what contemporary imaging is dictating so no Brian,if the Earth didn't rotate the stars would appear to move and in 365 days 5 hours 49 minutes they would move in a complete 360 degree cycle,if they didn't you would have big problems. you say: "If the Earth didn't rotate, then all the stars would stay in place, and observing the night sky at high power would be easy." obviously you have never looked through a scope at high power! the limiting factor is NOT the earth's rotation....it's the seeing (atmospheric instability) |
#4
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amateur astronomer found blown to pieces, double-stacked PSTfound nearby
On Sep 19, 8:37*pm, "David Staup" wrote:
"oriel36" wrote in message * "If the Earth didn't rotate, then all the stars would stay in place, and observing the night sky at high power would be easy." obviously you have never looked through a scope at high power! the limiting factor is NOT the earth's rotation....it's the seeing (atmospheric instability) I said the opposite,in the absence of daily rotation,the Earth has a single daylight/darkness cycle with the polar coordinates acting as a window into this orbital component.It is by far the single largest modification in astronomy as it introduces a traveling axis about which the polar coordinates,representative of all locations on Earth,turn with respect to the central Sun with a 360 degree rotation coincident with the orbital period of the planet. The Earth's daily rotation and orbital motion have very definitive parameters separately and in combination with the effects linking variations in the length of the natural noon cycle tied to the explanation for the seasons,both involving dual axes corresponding to two separate daylight/darkness cycles.The polar daylight/darkness cycle is easily understood using an imitation analogy or drawing on the unique features of Uranus which provide an orbital longitude meridian for the planetary orbital trait,in the 7 year period shown,the orbital turning of Uranus is roughly 30 degree - http://www.daviddarling.info/images/...gs_changes.jpg You are part of a cult so I don't expect anything further from you,the sequence of images require an able interpreter and they are hard to come by presently,in short,the seasons are explained by two dynamics and not 'tilt' to the Sun or anything else,the seasons are caused by two separate rotations to the central Sun indicative of two motions with the polar daylight/darkness cycle reflecting the orbital trait.I need people to either snap out of their lethargy or grow up insofar as the study of global climate hasn't even started yet. |
#5
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amateur astronomer found blown to pieces, double-stacked PSTfound nearby
On Sep 19, 9:24*pm, oriel36 wrote:
hasn't even started yet. Talking of feckwits.. if the cap fits, wear it. Try not to wear it out. Nor your welcome. |
#6
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amateur astronomer found blown to pieces, double-stacked PSTfound nearby
"What it is, actually, is the Earth's rotation. If the Earth didn't
rotate, then all the stars would stay in place, and observing the night sky at high power would be easy." Brian Tung So Brian,you can open up a productive discussion from a single statement ,everything from the modified explanation for the seasons , why a satellite in a Sun-Synchronous orbit registers the orbital turning of the Earth to the central Sun beneath it,how the calendar system meshes with the daily and orbital motions of the Earth or the many hundreds of different issues that will emerge as the explanation for the polar daylight/darkness cycle becomes clearer. Even the constellations spotters should tell you that certain stars disappear over the course of a year so,the stars would appear to move a little less than one degree in 24 hours about the same axis as the polar coordinates turn in a circle/cycle to the central Sun.When they put a telescope at a great distance from the Earth,perhaps on one of the moons of an outer planet, and looking back they will see roughly what we see of Uranus. So,like it or not you get the privilege of having you FAQ reworked to something positive. |
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