25-12-2019, 06:34 PM
(This post was last modified: 25-12-2019, 07:08 PM by voynichbombe.)
It is curious though, the sloppy spiral spokes do not seem to be drawn completely by freehand.
If one does not have a compass at hand, there are several ways to improvise:
- take round objects of different sizes (here it would be two) to do outlines. Not very precise
- take a pin or needle, attach a string to it and fasten a pen to the other end. Slightly better, but also not very suitable for small scales
I cannot tell if there is a pinhole in the middle. Anyways, both methods will give sloppy results.
What I mean, the outer ends of the spokes seem more even than the inner ends, where the lines wiggle around letters sometimes (so possibly they were even applied after the writing).
A camera obscura with its many optical faults was certainly also used more as an "aid", to help, so to say. I personally took note of that when I hastily build one last minute to watch a solar eclipse (Alhazar mentions this kind of distortion in his book on optics). One of its most prominent users, the English landscape painter Hockney is known to have changed the images to his liking.
The grades of optical distortions are larger for small devices. I once went into a huge "walk-in" one, it was amazing.
Another interesting aspect of using a portable camera obscura is that you can use it to "photoshop", mixing two or more sources.
If one does not have a compass at hand, there are several ways to improvise:
- take round objects of different sizes (here it would be two) to do outlines. Not very precise
- take a pin or needle, attach a string to it and fasten a pen to the other end. Slightly better, but also not very suitable for small scales
I cannot tell if there is a pinhole in the middle. Anyways, both methods will give sloppy results.
What I mean, the outer ends of the spokes seem more even than the inner ends, where the lines wiggle around letters sometimes (so possibly they were even applied after the writing).
A camera obscura with its many optical faults was certainly also used more as an "aid", to help, so to say. I personally took note of that when I hastily build one last minute to watch a solar eclipse (Alhazar mentions this kind of distortion in his book on optics). One of its most prominent users, the English landscape painter Hockney is known to have changed the images to his liking.
The grades of optical distortions are larger for small devices. I once went into a huge "walk-in" one, it was amazing.
Another interesting aspect of using a portable camera obscura is that you can use it to "photoshop", mixing two or more sources.