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wide angle unguided astrophotography

astrophotography imaging
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#1 Rhinoict

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Posted 09 October 2019 - 03:09 PM

Very new to wide angle unguided astrophotography.

 

My question is that if I'm taking quite a few unguided images that I want to stack, at some/what point do I need to recenter the milky way in the viewfinder so the images will stack with more accuracy?

If this is the case, What do I use as a reference point when I recenter the image.

 

I'm using a 24MM f/1.4 lens on a Nikon D5600



#2 petert913

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Posted 09 October 2019 - 03:12 PM

With a standard tripod it would be near impossible to recenter the stars. This is due to the arc created as the stars move overhead.

 

But you should be able to get 4-5 (maybe more) 30 second frames that you can stack nicely.   Others may have more informed

opinions than mine. 



#3 2ghouls

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Posted 09 October 2019 - 03:16 PM

I wouldn't worry about it unless you are planning to take hundreds. Unguided images will be short (10 seconds or so to have perfectly round stars) meaning you could take 30 to stack in under 5 minutes. In 5 minutes, the stars won't move that much and the stacking program should have no problem finding enough stars to stack all your images.



#4 Rhinoict

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Posted 09 October 2019 - 03:31 PM

OK,

Thanks for the info. I doubt I'll be collecting anywhere near 30 images.



#5 mic1970

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Posted 09 October 2019 - 04:03 PM

Rhinoict... What I do is:  I take ten shots and move slightly in the direction the stars are moving.  If you can focus on a bright star, try to move it to the same place.  When you stack, the outside of the pic will get a little crazy, but the meat of the pic should be go.


Edited by mic1970, 09 October 2019 - 04:09 PM.

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#6 17.5Dob

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Posted 09 October 2019 - 08:59 PM

Unguided...or untracked...there is a huge difference...

I shoot "un-guided" for 1-3 minutes all of the time using my little iOptron SkyTracker vs guiding with my big EQ mount and never have to recenter anything , even after 3-4 hrs...

Or do you mean un tracked, and just shooting from a static tripod ?.

In that case, you can recenter every 10-20 frames and stacking will get rid of the parts of the frame that don't intersect if you're a bit off recentering your camera..

 



#7 17.5Dob

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Posted 09 October 2019 - 09:02 PM

  When you stack, the outside of the pic will get a little crazy, but the meat of the pic should be go.

You're using the wrong stacking mode if your edges "Get Crazy".

In DSS, you want to use "Intersection Mode"



#8 mic1970

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Posted 10 October 2019 - 07:38 AM

I'll try that.  

You're using the wrong stacking mode if your edges "Get Crazy".

In DSS, you want to use "Intersection Mode"



#9 Rhinoict

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Posted 10 October 2019 - 01:54 PM

I plan to use a tripod only with the DSLR, no SkyTracker/SkyGuider etc.




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