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DSI ii - first try ever



 
 
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  #1  
Old July 7th 07, 12:05 AM posted to sci.astro.ccd-imaging
pascal[_2_]
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Posts: 19
Default 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  
Old July 8th 07, 10:14 AM posted to sci.astro.ccd-imaging
David Nakamoto
external usenet poster
 
Posts: 183
Default 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  
Old July 10th 07, 12:50 PM posted to sci.astro.ccd-imaging
Tomasso
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Posts: 2
Default 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  
Old July 15th 07, 05:50 AM posted to sci.astro.ccd-imaging
David Nakamoto
external usenet poster
 
Posts: 183
Default 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  
Old July 23rd 07, 10:46 PM posted to sci.astro.ccd-imaging
pascal[_2_]
external usenet poster
 
Posts: 19
Default 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  
Old July 26th 07, 11:38 PM posted to sci.astro.ccd-imaging
Pat Clough
external usenet poster
 
Posts: 5
Default 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.



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