Canon 20D Pinhole

I've been experimenting with pinhole body caps on my Canon 20D and I

have a couple of questions I was wondering if anyone could shed some

light on.

<p>

I've been having the most success with the Loreo Lens In A Cap

variable-aperture pinhole cap. It's adjustable in steps from f/5.6 to

f/64. Often, when I take a picture at f/64, I get a sort of

fog-looking brightness in the picture. I assume that this is just

from more light hitting that area of the sensor, but am I correct in

this thinking? I would think that the brighter/fogged area would be

more centered than it is. <a

href="http://sacredartichoke.com/images/pinhole/IMG_9026-01.jpg"target="new">Here

is an example of what I am talking about - note the fog over the

second bridge support</a> (one second exposure f/64 ISO 100 ). <a

href="http://sacredartichoke.com/images/pinhole/IMG_9029-01.jpg"target="new">This

is another</a> (3 seconds f/64 ISO 100). I'm willing to accept this

as what the pinhole photos will look like, but would I get the same

type of result with film? Is there any way to minimize this fogging?

<p>

With a different cap & an aperture of f/180 and shutter time of 15

seconds, <a

href="http://sacredartichoke.com/images/pinhole/IMG_9021-01.jpg"target="new">the

results are miserable</a>. Is this diffraction making everything so

blurry? Would this cap be this bad on a film body?

f/64 is much less light, in fact the least for that cap, based on the range of the adjustments you say it has.

By "more light," what I meant is more light hitting that area of the sensor compared with the rest of the frame.

Looks like it could be some flare, maybe from the edges of the aperture or some part of the lens mount. First I had heard of the Loreo. The site doesn't seem to show any details of the construction. Can you tell us anything about those things from looking at it? Maybe the results are something you can live with if you take them into account in using the setup. Weston and the others in the f64 group actually used quite simple rectilinear lenses and got quite astounding results.

I hadn't thought of flare. There was a high overcast sky with plenty of fog and I was standing underneath a bridge, but there could have been light reflecting off the river, I suppose. <a href="http://sacredartichoke.com/images/pinhole/fisheye.jpg"target="new">This shot with a Zenitar fisheye on the same camera</a> can give you an idea of what the light was like.

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<a href="http://sacredartichoke.com/images/pinhole/traincar.jpg"target="new">Here is another example of the same symptom</a>.

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The Loreo cap does have a glass(?) lens and the fog doesn't show up at the widest apertures. It starts at f/16 and gets worse at f/32 and then really bad at f/64. I know the image from the 20D decreases at small apertures - so I don't know if this is due to that or to the lens.

I tried doing pinhole photos with my Canon 300d (Rebel) and was very disappointed. I took a body cap, drilled a hole in it and then taped a Lenox Laser 150 micron laser drilled pinhole and tried a variety of settings but the best pictures were very blurry, so I gave up... Nothing like the pinhole stuff I've done with regular film and the same pinhole.

Yes, at f/180 it's diffraction hitting you hard.

I can't understand why people would want to stick a pinhole cap on a 20D! What fun is that? If you want the pinhole effect... shoot with a real pinhole camera.

<< I can't understand why people would want to stick a pinhole cap on a 20D! What fun is that? If you want the pinhole effect... shoot with a real pinhole camera. >>

 

What exactly is a "real" pinhole camera? Is my Zero Image a "real" pinhole but a Quaker Oats can camera not? Maybe the reverse? Is it "real" if you make it yourself and "fake" if you don't? What if Lance made the pinhole body cap himself, does that give him more "cred" in your "real vs not real" argument?

 

Are you serious with this question or are you just trolling?

<tt>What fun is that? </tt>

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Plenty of fun. I like experimenting and messing around with systems where unknown effects are expected.

<p>

<tt> If you want the pinhole effect... shoot with a real pinhole camera.</tt>

<p>

Which would be defined as what? I always thought of it as a setup where the light entered through a small aperture. You got a hang-up with rules or something?

 

 

You've

<con't from cut off post>You've obviously had experience with toy cameras and whatnot. Why does the idea of a pinhole cap on a 20D bother you so much?