No. LED is not a point source; even if it were, its light rays are not parallel: they diverge; and even if they did not, diffraction makes the light spot larger than the pinhole.If i am holding led-light(one pin) directly onto pinhole it will be projected to groundglass.
Can the size of this projection tell me the size of the pinhole?
If you have an enlarger available you could set it up for a known magnification, ideally in the 5x to 10x range. Insert the pinhole plate as a negative, measure the projected "enlarged" image of the hole, and divide the reading by the magnification. While we love to be accurate, three digit precision isn't necessary for pinhole work.
APUG welcomes discussions about using scanners or other sorts of digital equipment for purposes like this.You can try to measure the pinhole size using a s***r [edited to meet apug requirements; hope you still understand what I mean]
[/QUOTE]. . . lensboard is 82.3 x 82.3mm. which standard is this? Thanks
63-65mm not 40mm min. bellows collapsed.Received a Polaroid MP3 with pinhole taped into board-hole.
When bellows are closed i calculated approx 65mm FL. CORRECTED(not 40mm)
If i am holding led-light(one pin) directly onto pinhole it will be projected to groundglass.
Can the size of this projection tell me the size of the pinhole?
How ist it calculated?
pinhole-size leads to a certain FL-range i was told.View attachment 158584
NB: Shinkphoto/skinpinhole has a copal-0-set with pinhole, Zone Plate an Zone sieve. If no shutter is used 30mm hole must be drilled into lens-board. NB; ist linhof 82.5 x82.5mm
peak-loupe with multiple scales
You mean this PEAK Lupe?Will do later: Its called PEAK Scale Lupe 10x (Lupe is german). it has a transparent ring to use external light from the sides.
it should be on peak-site. I have it with the leather bag.
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