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#1
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DSI ii - first try ever
I have an heq5 mount.
I did my first try tonight, for 2 hours then the sky became crowed with orange clouds, which stopped the whole thing. I mounted the dsi on a tak newton 130, 800mm (F/6) and pointed at M53, nice surprise, it was there showing on envisage, actually more visible on the computer than on the eyepiece.tried to focus but ended up with a more fuzzy image.Then came back. The magic focuser not helping much. then i pointed it at Arcturus and decided to take a pic (M53 was already behind a cloud), did the set of dark frames and started to take pics with 15 s exposure. To my surprise the star was shifting slightly (about 5mm) on the screen every 15 s, therefore after a few minutes my composite pic was showing a long bright line (in the place of arcturus). So i said to myself that the composite image should (but does not) recognize that the next image has shifted slighly. I also told myself` that such a shift is minor and if i want to reduce it i would have to do a hell of an alignment. Unless i am missing something. |
#2
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DSI ii - first try ever
pascal wrote:
I have an heq5 mount. I did my first try tonight, for 2 hours then the sky became crowed with orange clouds, which stopped the whole thing. I mounted the dsi on a tak newton 130, 800mm (F/6) and pointed at M53, nice surprise, it was there showing on envisage, actually more visible on the computer than on the eyepiece.tried to focus but ended up with a more fuzzy image.Then came back. The magic focuser not helping much. then i pointed it at Arcturus and decided to take a pic (M53 was already behind a cloud), did the set of dark frames and started to take pics with 15 s exposure. To my surprise the star was shifting slightly (about 5mm) on the screen every 15 s, therefore after a few minutes my composite pic was showing a long bright line (in the place of arcturus). So i said to myself that the composite image should (but does not) recognize that the next image has shifted slighly. I also told myself` that such a shift is minor and if i want to reduce it i would have to do a hell of an alignment. Unless i am missing something. You're best bet is to do as precise an alignment as you can. Good tracking goes a long way to avoid frustrations at the eyepiece. Or put it another way, electronic tracking is no substitute for a good tracking mount. --- Dave |
#3
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DSI ii - first try ever
"David Nakamoto" wrote in message news:xV1ki.559$YH3.466@trnddc08... pascal wrote: I have an heq5 mount. I did my first try tonight, for 2 hours then the sky became crowed with orange clouds, which stopped the whole thing. I mounted the dsi on a tak newton 130, 800mm (F/6) and pointed at M53, nice surprise, it was there showing on envisage, actually more visible on the computer than on the eyepiece.tried to focus but ended up with a more fuzzy image.Then came back. The magic focuser not helping much. then i pointed it at Arcturus and decided to take a pic (M53 was already behind a cloud), did the set of dark frames and started to take pics with 15 s exposure. To my surprise the star was shifting slightly (about 5mm) on the screen every 15 s, therefore after a few minutes my composite pic was showing a long bright line (in the place of arcturus). So i said to myself that the composite image should (but does not) recognize that the next image has shifted slighly. I also told myself` that such a shift is minor and if i want to reduce it i would have to do a hell of an alignment. Unless i am missing something. You're best bet is to do as precise an alignment as you can. Good tracking goes a long way to avoid frustrations at the eyepiece. Or put it another way, electronic tracking is no substitute for a good tracking mount. --- Dave Doesn't registax fix this. T - likely to take the plunge soon. |
#4
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DSI ii - first try ever
Tomasso wrote:
"David Nakamoto" wrote in message news:xV1ki.559$YH3.466@trnddc08... pascal wrote: I have an heq5 mount. I did my first try tonight, for 2 hours then the sky became crowed with orange clouds, which stopped the whole thing. I mounted the dsi on a tak newton 130, 800mm (F/6) and pointed at M53, nice surprise, it was there showing on envisage, actually more visible on the computer than on the eyepiece.tried to focus but ended up with a more fuzzy image.Then came back. The magic focuser not helping much. then i pointed it at Arcturus and decided to take a pic (M53 was already behind a cloud), did the set of dark frames and started to take pics with 15 s exposure. To my surprise the star was shifting slightly (about 5mm) on the screen every 15 s, therefore after a few minutes my composite pic was showing a long bright line (in the place of arcturus). So i said to myself that the composite image should (but does not) recognize that the next image has shifted slighly. I also told myself` that such a shift is minor and if i want to reduce it i would have to do a hell of an alignment. Unless i am missing something. You're best bet is to do as precise an alignment as you can. Good tracking goes a long way to avoid frustrations at the eyepiece. Or put it another way, electronic tracking is no substitute for a good tracking mount. --- Dave Doesn't registax fix this. T - likely to take the plunge soon. Only if every frame of the original data does not have any smearing due to motion of the object. --- Dave |
#5
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DSI ii - first try ever
I just had forgotten (to read the manual) to track using the square
box around a guide star. now it is much better, except that i really need a better tracking indeed but the software is adjusting the shifting perfectly. DSI gets to give u not bad pics even if you are a beginner, but not sure you can get stunning pics out of it. |
#6
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DSI ii - first try ever
Pascal,
I am no expert, but aren't you being a little presumptuous, condemning it before you have even learnt to use it?? And you just HAVE to get good polar alignment and focus. No substitute. I am still in the early stages of learning. "pascal" wrote in message ups.com... I just had forgotten (to read the manual) to track using the square box around a guide star. now it is much better, except that i really need a better tracking indeed but the software is adjusting the shifting perfectly. DSI gets to give u not bad pics even if you are a beginner, but not sure you can get stunning pics out of it. ----------------- www.Newsgroup-Binaries.com - *Completion*Retention*Speed* Access your favorite newsgroups from home or on the road ----------------- |
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