Stacking using rail vs focus
Apr 25, 2016 08:07:37 #
Does anyone know of a site that analyzes the optical difference between creating a stack by keeping the camera still while changing the focus versus keeping the focus fixed while moving the camera?
I have read the post on the Zerene site http://zerenesystems.com/cms/stacker/docs/troubleshooting/ringversusrail
I am interested in the physics behind the two optical processes.
I have read the post on the Zerene site http://zerenesystems.com/cms/stacker/docs/troubleshooting/ringversusrail
I am interested in the physics behind the two optical processes.
Apr 25, 2016 09:59:39 #
You seem to be very interested in optics & optical design ( A quote from one of your earlier posts: "The reason I want to learn more about optics is that I plan to work to create scientifically useful pictures, and they tend to have some very picky requirements. As a side-effect I may need to modify some of the software, and to do that I need to understand the physics behind it."
In what scientific field will you be photographing? I'm photographing the rare & new species in an insect collection & need accurate scale bars in the photos which I am now able to do. With more details about your end goal I ( or someone else) may be able to help What requirements are you referring to?
In what scientific field will you be photographing? I'm photographing the rare & new species in an insect collection & need accurate scale bars in the photos which I am now able to do. With more details about your end goal I ( or someone else) may be able to help What requirements are you referring to?
Apr 25, 2016 10:58:44 #
It sounds like our interests are similar. I am helping a friend with the biology of the Mojave, with an emphasis on scorpions. Accurate scales would be very useful, both for the naturalists and the taxonomists. I am also working on creating virtual images, using the Cognisys rotary platform.
My interest in the optics is mainly because I have always found I can use any technique better if I understand the underlying theory.
My interest in the optics is mainly because I have always found I can use any technique better if I understand the underlying theory.
Apr 25, 2016 15:33:28 #
I have stacked using both methodologies and I have to say that I've never noticed any visual difference between the two. The one technical / visual difference would be if you are using a stationary camera with the object moving rather than the opposite. In this case, the concern would be does the light source move as well. I rarely do this because most cameras have the capability of being better at "settling" between individual image files. I've also used Helicon Focus and Zerene. Helicon allows you to stack using raw files; with Zerene I convert to TIFFS. I'm not sure, I've helped-- but there ya' go.
Apr 25, 2016 16:25:14 #
MACT wrote:
there are valid reasons to use one or the other focusing method. Zerene explains it fairly well....My interest in the optics is mainly because I have always found I can use any technique better if I understand the underlying theory.
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