Pine-hole photo follow up from last post
Jan 29, 2019 13:49:21 #
wingclui44
Loc: CT USA
After remaking another pin hole carefully, this one is best one I could make, it's about 0.15mm. I measured this one with comparing to a commercial scale.
First, I used a 80mm Sony video camera lens mounting reversed with a 11mm extension ring on a full frame DSLR, it created 2X magnification, then took the 2X macro images of both the pin hole and the scale. It showed the pine hole is about 1/5 the size of the 0.7mm hole on the scale. The angle of view of the pin hole on my Df is about 50mm focal length. By calculation: the pine hole is about 0.7mm/5=0.14mm, and then the F stop of the pine hole will be 50/0.14=f357.
Here's two images taken with it, and the actual pine hole comparing to the 0.7mm hole on the scale.
First, I used a 80mm Sony video camera lens mounting reversed with a 11mm extension ring on a full frame DSLR, it created 2X magnification, then took the 2X macro images of both the pin hole and the scale. It showed the pine hole is about 1/5 the size of the 0.7mm hole on the scale. The angle of view of the pin hole on my Df is about 50mm focal length. By calculation: the pine hole is about 0.7mm/5=0.14mm, and then the F stop of the pine hole will be 50/0.14=f357.
Here's two images taken with it, and the actual pine hole comparing to the 0.7mm hole on the scale.
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