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philslizzy
Joined: 07 Aug 2012 Posts: 4744 Location: Cheshire, England
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Posted: Sun Jan 06, 2013 12:39 am Post subject: Sky stacking, macro stacking? |
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philslizzy wrote:
I've read these terms on this forum and would like to understand what they are.
I think macro stacking could be blending different images with different points of focus am I correct?
So what's sky stacking and indeed what other things can be stacked
Heres a photo of an orchid, I focused on 5 points and blended the photos in PS's blend layer mode. Stacking?
edit: I took 5 separate photos
Softened in PS too, the image was shot specifically for my wife to her spec
Last edited by philslizzy on Sun Jan 06, 2013 1:24 am; edited 1 time in total |
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Himself
Joined: 01 Mar 2007 Posts: 3245 Location: Montreal
Expire: 2013-05-30
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Posted: Sun Jan 06, 2013 1:12 am Post subject: Re: Sky stacking, macro stacking? |
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Himself wrote:
philslizzy wrote: |
I think macro stacking could be blending different images with different points of focus am I correct? |
No different images.
Same image, different points of focus. How many? From 2 to hundreds. Depends on the object size.
Then, you can use the stacking software of your choice: Photoshop, Helicon, Zerene stacker, etc.
What you did is called stitching. _________________ Moderator Himself |
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philslizzy
Joined: 07 Aug 2012 Posts: 4744 Location: Cheshire, England
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Posted: Sun Jan 06, 2013 1:21 am Post subject: |
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philslizzy wrote:
Perhaps I missed something in your reply but I thought how you described it was what I did with this picture. I thought stitching was for panoramas.
edit: just edited my first post so you understand I took 5 images first
I'm still not wiser. What is sky stacking and someone mentioned stacking photos of the moon in this topic
http://forum.mflenses.com/tokina-300mm-f-5-6-for-moonshots-t55777.html
Thanks for your quick reply! |
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David
Joined: 13 Apr 2011 Posts: 1869 Location: Denver, Colorado
Expire: 2013-01-25
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Posted: Sun Jan 06, 2013 2:47 am Post subject: |
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David wrote:
Stacking is where one takes multiple images of the same subject from the same perspective with different focal planes and then uses a photo editing software to assemble them into one image with everything (or at least more) thing in focus.
Macro stacking is doing that with a macro image.
That can also be done with, say, a tree branch or highway or something with a long depth of field that isn't a macro.
Stitching is composing a larger scene from multiple smaller images, like a mosaic. _________________ http://www.youtube.com/user/hancockDavidM |
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David
Joined: 13 Apr 2011 Posts: 1869 Location: Denver, Colorado
Expire: 2013-01-25
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Posted: Sun Jan 06, 2013 2:49 am Post subject: |
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David wrote:
Regarding moon and sky stacking, same basic concept. With a telephoto lens, even at f22, the entire moon won't be in sharp focus. So, using that telephoto, focus on the moon and then move through the lens' focal range on the moon (horizon, mid-range, near-surface, etc.). Then stack them in a photo editing software.
To do this, open each image as a layer in a photo editing program. The software analyzes the images and determines what regions are most in focus in each image (compared to the other images.) It then removes everything except the most-in-focus portions of each layer. _________________ http://www.youtube.com/user/hancockDavidM |
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Himself
Joined: 01 Mar 2007 Posts: 3245 Location: Montreal
Expire: 2013-05-30
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Posted: Sun Jan 06, 2013 4:13 am Post subject: |
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Himself wrote:
You said "different images" that's why my answer.
David explained it better.
I don't agree with the moon part. Even with a 5000/2.8 ( assuming it's possible) DOF is that huge considering the distance that you won't need multiple images to stack them. _________________ Moderator Himself |
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David
Joined: 13 Apr 2011 Posts: 1869 Location: Denver, Colorado
Expire: 2013-01-25
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Posted: Sun Jan 06, 2013 5:41 am Post subject: |
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David wrote:
Lens variations may factor into how the moon focuses. For instance:
400mm, f8 or f11.
To my eye, the edge look to be much more in focus than the middle. _________________ http://www.youtube.com/user/hancockDavidM |
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philslizzy
Joined: 07 Aug 2012 Posts: 4744 Location: Cheshire, England
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Posted: Sun Jan 06, 2013 10:43 am Post subject: |
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philslizzy wrote:
Himself wrote: |
You said "different images" that's why my answer...David explained it better... |
Yes sorry about that.
Ok you and David have explained it so i now understand the concept. I was right about the macro thing then, and what I've done with the orchid photo is stacking. I haven't used or heard the phrase before, I call it focus depth (my words) by layer blending.
Himself wrote: |
...I don't agree with the moon part. Even with a 5000/2.8 ( assuming it's possible) DOF is that huge considering the distance that you won't need multiple images to stack them. |
I too am not sure the moon would require focusing in different areas but I'm going to give stacking a go next time I can get a clear, moonlit sky to try it out or myself. The edge of the photo showing the craters looks sharper because of the shadow contrast. The middle of the moon is quite flat and the light is straight on so there are no shadows to speak of. I wonder if different exposures would make a difference?
I googled sky stacking.Interesting, it appears that you take several shortish exposures of the night sky, along with some blank ones and layer blend (stack) them in Photoshop. This removes the noise, dead pixels and improves the colour and contrast of the star images.
Thanks again guys for your answers!
Phil |
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Pontus
Joined: 18 Dec 2011 Posts: 1471 Location: Jakobstad, Finland
Expire: 2016-08-25
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Posted: Sun Jan 06, 2013 11:35 am Post subject: |
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Pontus wrote:
I'm not sure but I think Sky Stacking is using several exposures and merging them for a well exposed subject AND sky. Basically emulating the use of a graduated neutral density filter. _________________ Follow this link for my FOR SALE list (partially updated 19.11.2015) |
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philslizzy
Joined: 07 Aug 2012 Posts: 4744 Location: Cheshire, England
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Posted: Sun Jan 06, 2013 12:57 pm Post subject: |
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philslizzy wrote:
Pontus wrote: |
I'm not sure but I think Sky Stacking is using several exposures and merging them for a well exposed subject AND sky. Basically emulating the use of a graduated neutral density filter. |
Hmmm thats what I would have thought, then I found this, typical of many tutorials on the subject:
http://www.instructables.com/id/Astrophotography-Star-Photo-Stacking/
Edit: What you are suggesting sounds like HDR |
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