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07-22-2011, 03:49 PM   #1
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Pentax Pinhole Images

I just got my first pinhole body cap today. Here is a test image I shot with my K20D.

I'd love to see pinhole images from everyone.

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07-22-2011, 03:54 PM   #2
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This is cropped a bit - from a K100D 0.30mm pinhole, ~50mm focal length


Looks like similar image quality to me - right about what theory predicts.

Dave
07-22-2011, 04:05 PM   #3
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Indeed. Mine is also an 0.3mm, which I believe results in an aperture around f168. I'm excited to start working with the depth of field.
07-22-2011, 05:15 PM   #4
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The problem with pin hole lenses is that they can't be coated.
Thinking of it...with no glass, there can't be any flare...
Pinholes are fun, but hard work. Haven't done it since film days.

07-22-2011, 06:23 PM   #5
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After I got my K20D AF360 DA10-17 DA18-250 FA50 kit, my first optical purchase was... [/me opens the envelope...] a bodycap pinhole. Disappointed the hell out of me. I have shots of fuzzy backgrounds highlighting sharp dust. On my cam it's effectively 45/180, and it lets dust in, so I have to blow the sensor every few minutes. Images are fuzzy because that's WAY past the diffraction limit on a APS-C frame. And it's ~45mm because it can't get any closer to the frame. Did I mention dust? It's horrible in a dusty environment. Use it in heavy rain or total vacuum only.

I love pinholes, I really do. I have a nice handcrafted wooden 6x9cm MF pinhole cam that delivers nicely. (Thanks, Sis!) I've made more than a few oatmeal-carton pano pinhole cams, loaded with 8x10in photo paper. I've seen images shot with very small and very very large pinhole cams. But on a camera with an SLR mirror box and a frame smaller than 135/FF, it's just not worth it, not unless you're really really into dusty impressionistic blobs. A pinhole on a Leica-M or Fed-5 or Argus-C3, fine. A pinhole on an APS-C dSLR, no.

(I've posted ideas for very very very large pinhole cams. I'll try to dig those up.)
04-04-2012, 09:02 PM - 2 Likes   #6
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Maybe to late...just spent some time today to make a pinhole for my K20D...:-)...here it is the picture post processed in ps3.

I managed to make it with variable focal distance...so mine is roughly from 28-35 to 50-55 mm...
The hole is really small...

The picture was taken from 30-35 cm, 20 sec.exposure time at 400 ISO...
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Last edited by Vasyl; 04-04-2012 at 09:12 PM.
04-05-2012, 01:02 AM   #7
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Very cool. I have misplaced my pinhole cap.
04-05-2012, 06:45 AM   #8
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QuoteOriginally posted by Vasyl Quote
I managed to make it with variable focal distance...so mine is roughly from 28-35 to 50-55 mm...
Impressive picture! Much better than any I've managed. How did you build it with variable focal length?

04-06-2012, 01:21 PM - 2 Likes   #9
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Variable focus trick

QuoteOriginally posted by RioRico Quote
Impressive picture! Much better than any I've managed. How did you build it with variable focal length?
Here it is what I did...the trick is to make the holder flexible and strong enough to keep it bent in the bayonet...


and some pictures
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04-06-2012, 02:07 PM   #10
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QuoteOriginally posted by Vasyl Quote
Here it is what I did...the trick is to make the holder flexible and strong enough to keep it bent in the bayonet...


and some pictures
Yow! The first photo is incredibly sharp near the trees! I don't understand how it can be so sharp. Can you tell us more about the conditions like actual focal length & pinhole diameter? Did you post-process the image?
04-06-2012, 03:27 PM   #11
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Thank you.
Yes, I post-processed all of them. The first one is a stiched panorama of 6 shots. The distance to the roots was around 2 meters...I do not know what the actual focal length was/is, because the holder is a flexible material and the focal distance depends on how much I will bend it either inside or outside.
Do not ask me about the pinhole diameter....:-)...I just followed the instruction found in here...https://www.pentaxforums.com/forums/photographic-technique/112981-pinhole-photography-k10d.html
I drilled through the cardboard by holding my finger from the aluminum foil side, when I felt the tip of the needle I stopped...then I grinded the foil...
04-09-2012, 09:19 PM   #12
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Here it is some picture to show the hole size...the pin looks like a nail, but it is still the pin.
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02-25-2013, 01:48 PM   #13
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QuoteOriginally posted by Vasyl Quote
Here it is some picture to show the hole size...the pin looks like a nail, but it is still the pin.
Wow! Awesome images!!
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