Zerene Stacker

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stacker:docs:tutorials:tutorial002 [2012/10/04 20:09]
rjlittlefield
stacker:docs:tutorials:tutorial002 [2024/02/09 23:21] (current)
rjlittlefield
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 The reason this works is that Zerene Stacker can figure out by looking at the images how they should line up.  This allows it to automatically correct for typical variations in scale and position that are caused by refocusing. The reason this works is that Zerene Stacker can figure out by looking at the images how they should line up.  This allows it to automatically correct for typical variations in scale and position that are caused by refocusing.
  
-In this example, we turned the lens ring by hand.  However, with many cameras and lenses it's easy to tether the camera to a computer and let software control the auto-focus motor inside the lens to step focus. ​ This is described in other tutorials. ​ Using the motor usually provides more precise stepping than doing it by hand.+In this example, we turned the lens ring by hand.  However, with many cameras and lenses it's easy to tether the camera to a computer ​or smartphone ​and let software control the auto-focus motor inside the lens to step focus. ​ This is described in other tutorials. ​ Using the motor usually provides more precise stepping than doing it by hand.
  
 ===== Method #2 — Focusing by Moving the Camera or Subject ===== ===== Method #2 — Focusing by Moving the Camera or Subject =====
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 {{:​stacker:​docs:​tutorials:​tutorial002:​image006.jpg}} {{:​stacker:​docs:​tutorials:​tutorial002:​image007.jpg}} \\ {{:​stacker:​docs:​tutorials:​tutorial002:​image006.jpg}} {{:​stacker:​docs:​tutorials:​tutorial002:​image007.jpg}} \\
 Figure 5. Front and rear frames from focusing by moving the camera Figure 5. Front and rear frames from focusing by moving the camera
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-Using this method of focusing, there will be changes in magnification and perspective with all lenses. 
  
 When we process this second stack, we get the following result: When we process this second stack, we get the following result:
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 {{:​stacker:​docs:​tutorials:​tutorial002:​image008.jpg}} \\ {{:​stacker:​docs:​tutorials:​tutorial002:​image008.jpg}} \\
 **Figure 6.  Output image from method #2** **Figure 6.  Output image from method #2**
 +
 +When focusing by rail, there will be changes in magnification and perspective with all lenses. ​ Changes in magnification can be completely corrected by Zerene Stacker, but changes in perspective result in apparent movement that may give artifacts in the result. ​ See [[:​stacker:​docs:​troubleshooting:​ringversusrail|HERE]] for more discussion on this point. ​ For critical work, it's better to focus by ring and to choose a lens model that does not change length as it focuses.
 +
  
 ====== Summary: Use either method but be sure to check framing ====== ====== Summary: Use either method but be sure to check framing ======
stacker/docs/tutorials/tutorial002.txt · Last modified: 2024/02/09 23:21 by rjlittlefield
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