Yoshizen's Blog

Double-Density Pinhole Photography

Ideally, soft-focus image should have solid focused core and the soft flair around it.

The more the photographer is decent grown-up person, even soft image is rather subtle.  Though, I’m not very well grown up decent kind = tend to take it to the extreme   😀  (Hence, if I cook for myself, the taste is pretty strong = if it got to be spicy hot = it would be extremely HOT = Otherwise, what is the point to cook hot food  😀 )

Therefore, my soft-focused image goes to even more extreme = and in this  experiment, I gave a larger pinhole halo to small pinhole image = Concentric Double pinhole photo image  🙂   My approach to the Life is ” Why not ?”  😀

How you can put small hole inside of another hole  ? ? ?  = 😀

This is a Philosophical Problem = Hole is where VOID is = unlike gap, hole was represented by its circular edge, and this edge define the area of the Void = its inside is already Void, hence, there is nothing to form yet another hole  😀 

In photographic term, Pinhole can act like a lens, provided when the correct exposure was given though, when two hole exists in the same place, how to give long enough exposure (shatter time) for smaller hole while giving shorter time for larger hole ?  = 😀

—– My solution was, to cover larger hole with ND filter to reduce the incoming light.

(There is a gray filter called Neutral Density Filter to reduce the light, though together with Kodak CC (Color Compensating) filter they became hard to obtain item now.) 

—– Instead to use ND filter, I found an Aluminum coted plastic film of tea packaging. —– Not good enough for normal photography yet, enough for fuzzy pinhole photography  😀

[]To measure the Density, I placed this metallic film on front of the lens = the exposure reading was dropped from 1/1000th to 1/15 = 6 stops drop on shutter speed. 

Hence, the size of pinholes should have also 6 stops difference in F-aperture logarithmic scale.

(such as 2mm, 1.4mm, 1mm, 0.7mm, 0.5mm, 0.35mm. 0.25mm = larger pinhole, 2 mm and small one should be 0.25 mm)  —> The metallic film was stacked behind of 2 mm pinhole and a 0.25 mm hole was pierced in the center.  —– (From the result, I think, the lager hole should be 1.5 mm and smaller hole 0.18 mm = images would be a bit more sharper  😀 )

Still, the experiment which costed virtually nothing = results are not too bad  😀

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PS :  Few people who has failed to do this kind of pinhole photo asked me why —– I’m using equivalent lens (this time 100mm lens) for set-up and framing, then the View-finder was covered up with black-tape.  Stray light from View-finder makes wrong reading of exposure.

Most importantly, I’m using extremely capable Canon 5D (Mk 2 and Mk3).  

Pinhole photography may not be done with another camera. 

For instance, a pinhole shot done in 5D Mk3, with ISO 3200 and AV setting, 6 seconds —– the same pinhole mounted on Nikon D810 with the same ISO 3200 setting and 6 seconds couldn’t make picture, as it looks more than 3 stops under exposure.   Even with 30 sec’, 60 sec’, 120 sec’, further with ISO setting Hi2 (equiv’  25600) didn’t make ANY difference. 

Nikon couldn’t work with non-CPU incompatible lenses.

—– I wonder if anybody has ever done Astro-photography with Nikon D810, I would like to know how it was done ?

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PPS :  I found the way to to take Pinhole Photo by Nikon D810.

(1)  Go to the Menu / Non-CPU Lens / and set Max F-Aperture to F22.

(2)  Push Meter Coupling Lever (for Aperture Ring) anti-clock-wise, till F-aperture indicator on the Control Panel shows F45.

(3)  With ISO setting, 3200 or so and [A] (Aperture priority) = camera would give more or less correct exposure.

(*)  To adjust the exposure, even if you use the Exposure Time given by [A], say 2 second for Manual setting and select 1 second or 4 second —— exposure couldn’t be correct unless you push Meter Coupling Lever to F45 position.  (Because, the brightness of the image was not determined by the size of pinhole and the shutter-time, but by the gain of signal amplification in the image process )

 —- In fact, you can control Exposure Level by this Lever (by pushing it to F32 or F64 etc) = it is very awkward —-> Solution would be, tie a string to the Lever and fix it to the position of F45, and the Exposure adjustment should be made by changing ISO setting to another value.

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