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NexStar AP Graduates Images and Discussions

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#1826 bouffetout

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Posted 31 December 2012 - 01:59 PM

Isn'that suposed to be a nexstar thread ?

#1827 bouffetout

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Posted 31 December 2012 - 02:02 PM

Once again ,where is the nexstar ??? I use that thread to see what my nexstar can go...for other scopes there are other threads I think .

#1828 CelestronDaddy

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Posted 31 December 2012 - 04:10 PM

I don't know the history of the thread but I enjoy looking at the astrophotography and seeing what is used and how it is done... Tony

#1829 Midnight Dan

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Posted 31 December 2012 - 04:24 PM

Hi Buffetout:

The original title of this thread was "NexStar AP Graduates Images and Discussions". The idea was that some people started doing AP with the Nexstar, got better and graduated to a different mount for longer exposures. But they still wanted to discuss techniques with their friends here in the Nexstar forum.

-Dan

#1830 Arthur Dent

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Posted 31 December 2012 - 05:12 PM

ORIGINAL POST EDITED BY ARTHUR DENT - COMMENTS WITHDRAWN

Since I don't recognise your username Buffetout, let me first welcome you to the forum.

Posted Image

Art

#1831 ghataa

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Posted 31 December 2012 - 06:05 PM

I love this thread. A very nice group of folks who are happy to share thoughts, experiences, constructive comments and of course wonderful images, all/most with the Nexstar as a common starting point!

Happy New Year!!

George

#1832 Maverick199

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Posted 01 January 2013 - 08:37 AM

Once again ,where is the nexstar ??? I use that thread to see what my nexstar can go...for other scopes there are other threads I think .


I agree with Art here. This topic is named 'Nexstar' and that encompasses equipment that is part of Nexstar, being it the controller or the SCT which one uses in conjunction with an Alt/Az mount or an EQ mount. What exactly is the doubt you have regarding this? Maybe if you could elaborate a bit more on your thoughts, some of us could help shed light.

#1833 Arctic_Eddie

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Posted 01 January 2013 - 09:14 AM

From the original poster.

This thread is a companion to the AP Images with Original NexStar thread.

For one reason or another NexStar AP community is growing by leaps and bounds. As it grows, it spills into other (non-original NexStar) equipment and more sophisticated techniques. We also make (or continue talking to) friends that we met on this journey.

I believe existence of this tread is a testament of the simplicity and versatility of the original NexStar platform that welcomes new users and provides a natural path for growth in both Visual and AP.



#1834 bouffetout

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Posted 02 January 2013 - 09:36 AM

Thanks Dan !
Explained that way ,I understand .

#1835 oracleman

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Posted 02 January 2013 - 01:15 PM

Mmmm viewing fantastic Tel's Jupiter image I have a question about 8se azimutal mount... Is better have a equatorial mount? Maybe azimutal mount can *blur* image a little? I allways had that misgiving...

Also I attach old image from past mars oposition.

Configuration is nexstar 8se, spc900, and ultima barlow x2 (and quite good seeing :grin:)

Thanks in advance!

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#1836 milby

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Posted 02 January 2013 - 10:23 PM

Beautiful work on the planets, guys! Been trying to get a better Crab image but the weather hasn't cooperated. It's a bit small for the Hyperstar setup, too, but, wth.

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#1837 Maverick199

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Posted 03 January 2013 - 04:46 AM

That's a great image of Mars. For Planets, an alt/az should suffice judging from images taken using a Dob. You could record a short clip of 20 - 30 secs and stack those images.

Milby, compared to all your stunning images posted earlier, this one seems sub par but in a good way. :grin:

#1838 Tel

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Posted 03 January 2013 - 07:20 AM

Hi Milby,

Many thanks for your appreciation of the planetary imaging, Andy, Tom, and I have been working on lately. These are of course old or relatively old captures. It's just that we've each been trying to hone our processing techniques with regard to this particular facet of astrophotography as opposed to that of "deep sky".

As to your comments regarding your Crab nebula image, (above), it is, like you say, somewhat on the small side to show great detail but nevertheless in essence it's "all there". :bow::bow:

I can't help thinking though, (and please don't take offence), you might feel that in possessing a set of imaging kit second to none; particularly a wonderful hyperstar system; obliged to use it at every imaging opportunity. (?)

Consider for example, the size of the Rosette nebula you captured a little while back and then compare it with that of the recent Crab. In comparison the former is enormous and thus as you can appreciate, the amount of diverse detail contained in the two can never be realised in using the same imaging equipment; the Rosette being well suited to the Hyperstar system at a wide field ca. f/2.2, while the Crab would fare well in more restricted f/6.3 or even f/10 produced FOV.

My own routine is such that if I contemplate an evening's imaging, (on the rare occasion that the weather is "with me"), I tend usually to choose only one, (two at the most) target(s) on which to concentrate. This of course demands initial thought on the best combination of kit to use to suite the size of the chosen object.

To this end, (and forgive me if I've suggested this before ... at my age I lose track :lol:), I use Rod Wodaski's New Astronomy Press CCD Calculator which enables me to assess what FOV is likely to be produced for many objects in combination with 'scope, needs for focal length reduction and camera variations and thus select what to use to best effect.

http://www.newastro.com/

If as I suggest, you don't yet pursue this line or something similar, maybe it might help you to do so ? :idea:

Best regards and a very happy new year's imaging ! :bow::bow:

#1839 Tel

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Posted 03 January 2013 - 07:36 AM

Incidentally, Milby, with regard to detail in your above image of M1, this was, I'm afraid, the best I could bring out in it.

Best regards,
Tel

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#1840 Peter9

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Posted 03 January 2013 - 08:10 AM

Great Mars image oracleman and a great Crab Nebula image Milby.

Thanks for posting.

Regards. Peter.

#1841 haytor

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Posted 03 January 2013 - 08:41 AM

love the Mars image oracleman, both poles and some nice surface detail showing, very well done.

A good M1 shot milby in a wider field capture, as Tel says it wont show great detail with regards to its filiments but the overall capture remains good showing its nebulosity,i like it.

best regards,

Tom.

#1842 ghataa

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Posted 03 January 2013 - 08:55 AM

Great Saturn images guys!! Very impressive.

To Tel's point, one thing I did not appreciate when I entered imaging as a hobby was the "need" for a variety of focal lengths to suitably frame targets. I have spent most of my time in the 50-600 mm range, largely due to my comfort level with the CG5 and getting all the bits working. Lots of objects work well at 600 mm or below for me but many do not. For example, I personally don't find star clusters pleasing (M13, M92 etc) at 600 mm. When I get a higher capacity mount, the 2000 mm or focally reduced 1260 mm of the 8SE OTA will be a real treat when doing long exposures on smaller targets. However, there is plenty to keep my busy at the shorter focal lengths for now and it is more forgiving when guiding!!

Best,

George

#1843 haytor

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Posted 03 January 2013 - 09:49 AM

Great discussion this,Tel`s points are all well made and correct,matching targets to our respective set up FOV`s in advance, is often overlooked at the time of imaging, and can lead to disapointment when we discover a target is either too large or too small to fit nicely into a FOV of our individual set ups.

Being aware of that information now though,its a simple matter of using the software that Tel mentioned, in checking what targets will sit nicely into our respective FOV`s.

Aside from that though,i myself am not put off targeting small targets such as M1 or M57 the ring nebula,as i personally understand that although i might not capture very fine or great detail in a wider FOV, its still nice to capture these targets in the wider field to put them into perspective with the night sky.

There are also many large targets that are simply far to large to fit into my FOV, with these targets, i look for A.O.I. (Areas of interest)which close up, can show much finer detail such as that in the Rosette, dark lanes of matter and Bok globuals, ect.

Of course in an ideal world, we could each afford various set ups to cover all size targets,but to do that, i would have to sell all my children and grand children, plus my great grand child.I would keep my wife as she makes great gravy. :rofl5:

best regards,

Tom.

#1844 milby

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Posted 03 January 2013 - 11:15 AM

One of these days I'll get the camera down to the prime focus and start that ordeal, but as it is right now I can wheel the scope out and be ready to image in just a few minutes. That's a major plus when it's 11 degreees F! My plan is to canvass all that I can with the Hyperstar from my latitude then move on to other means.

I kind of like the contextual aspect of the smaller objects adrift, as it were.

#1845 Tel

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Posted 03 January 2013 - 02:51 PM

Hi Milby,

I fully understand your comment and completely respect your view ! :bow::bow:

I confess I have never owned nor had access to the use of a Hyperstar but can well imagine that once set in position with the accuracy it demands, I too would be extremely reluctant to remove it casually before I had exhausted, (at least), most of its unique potential to my satisfaction.

:waytogo:

Best regards,
Tel

#1846 Tel

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Posted 06 January 2013 - 01:54 PM

Mmmm viewing fantastic Tel's Jupiter image I have a question about 8se azimutal mount... Is better have a equatorial mount? Maybe azimutal mount can *blur* image a little? I allways had that misgiving...

Also I attach old image from past mars oposition.

Configuration is nexstar 8se, spc900, and ultima barlow x2 (and quite good seeing :grin:)

Thanks in advance!


Sorry, Oracleman, my apologies for not responding earlier. pure oversight on my part ! :bigblush:

Firstly, thank you heartedly for your comments on "my Jupiter", but in fact it was actually imaged by my good friend and CN colleague, Mushroom Bill, (Andy), also processed by him and with only my "finishing touches" added ! :bigblush:


To try to answer your question though, there is no doubt that a worm driven German equatorial mount will out-perform with greater consistency that of the spur driven 8SE mount.

However, this is not such an issue when creating short videos, such as your (and my) Philips SPC900NC webcam produces.

Thus, one objective in this case, is primarily to reduce the amount of backlash within those spur gears to a minimum.

Secondly, and in order to keep the planetary image on the screen of the lap top, (minimise drift, which is prevailent on this type of mount resulting from the inherent backlash)), I would tend, (for the sake of image detail) to increase the focal length of the 8SE by a factor of X2 (i.e. with a X2 Barlow lens), but be reluctant to exceed this: again to minimise on screen drift. (If the imaging conditions are with you, you can always modify the final size of the image at the processing stage).

Also in terms of reducing drift, set your frame rate to about 10 or 20 fps: (too many frames per second will likely cause artefacts to appear within the image, (noteably "Onion Rings"), and keep the exposure time reasonable: 2 minutes should suffice, (bearing in mind that if you're imaging Jupiter, its rotation is rapid enough to cause image blurring if the exposure time is prolonged much above this).

Thirdly, I'd recommend you stack your frames in Registax and initially process the stack there. If you have more processing software such as Photoshop available to you, then take the processing thereafter further into that. (Failing the availabilty of Photoshop etc. you can always use the free software processing program "Gimp" to good (final) effect.

Finally, even if you think you are satisfied with the image you have created, go back over it and try "tweaking" it further to see if you can gain something even better.

Experimentation is great fun ! :waytogo:

Hoping this helps, but if you do have further questions please let us know.

Best regards,
Tel

#1847 Tel

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Posted 06 January 2013 - 07:17 PM

By the way, taking a look at your image of Mars and manipulating it in Photoshop a little, can I assume it was taken sometime early in 2012, (ca. March ?), when it was not that well displayed, as I too found when I tried to image it around that time?

Nevertheless, you have captured the Syrtis Major well and both the waxing and waning polar "ice" caps, illustrating that much can still be done even when these objects are not well placed.

Many congratulations ! :bow: :bow:

best regards,
Tel

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#1848 milby

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Posted 12 January 2013 - 07:59 PM

Well, the skies have been dreadful in my corner of the globe so I've taken another crack at M42 processing and Mask techniques in PSE.

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#1849 CelestronDaddy

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Posted 12 January 2013 - 09:09 PM

Impressive! :grin:

#1850 nomosnow

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Posted 12 January 2013 - 10:59 PM

Here is my first attempt at a Jupiter video . I used my Nexstar 8 SE OTA on my CG-5 mount and the Neximage camera and a 2 times barlow.
I enjoyed the motion!
John

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