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DPChallenge Forums >> Side Challenges and Tournaments >> Go Lensless! April Pinhole/ZP Side Challenge
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Showing posts 26 - 50 of 53, (reverse)
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 03/24/2009 07:07:47 AM · #26
Originally posted by bvy:
Welcome ladies! (I'm going back to being a guy now...)


whew...I'm getting dizzy with all the switching back and forth! But you are so obliging, bvy, very gallant of you to switch over so I don't feel so outnumbered! :)
 03/24/2009 09:05:44 AM · #27
Karma - and anyone else interested - here's a VERY cheap option for a pinhole:

1. Find a body cap for your camera.
2. Determine the approximate center of the body cap.
3. With a drill, and about a 3/8 - 1/2" bit, drill a hole in the center of your body cap.
4. Find an aluminum soda can. With kitchen shears or similar, cut a circular disk of aluminum that's larger than the hole you drilled in your body cap. (About 3/4 - 1" will work.)
5. Set the disk on a wooden block/table, take a very small needle (quilting sharps work well) and set the needle point in the middle of the aluminum disk; rotate the disk while pressing down gently with the needle until the needle goes through. (Some would advocate "sanding" down the hole on the inside - I didn't do that.)
6. Take black electrical tape and tape the disk onto the body cap, with the pinhole more or less as centered as you can get it.

Next - remove lens from camera, attach body cap with teeny hole in it. Laugh at yourself when you try to look through the viewfinder... :-) Oh, and cringe when you first look at the pictures - you will find you have a TON of sensor dust!
 03/24/2009 09:10:22 AM · #28
I'll play too, if I may. I've tried the lens cap concept, but used heavy tin foil instead of an aluminum soda can. I'll try the soda can this week, since I wasn't thrilled with the tin foil.

Melethia - isn't the aluminum can rounded? Do I have to pound it flat before I begin, or is the curved shape better?

Message edited by author 2009-03-24 09:10:42.
 03/24/2009 09:45:13 AM · #29
Most soda cans these days are very thin aluminum. They are round but when you cut out the disk, it's not very curved. Once you tape it down on the body cap, it'll lay pretty flat. The nice thing about pinholes is they're not an exact science. :-)
 03/24/2009 10:19:22 AM · #30
Originally posted by Bebe:
I'll play too, if I may.


Welcome! That goes for everybody else, too!
 03/24/2009 04:06:19 PM · #31
Some pinhole/zone plate goodness, for inspiration:

slowlight
Guillaume Zuili
zonezero
03/24/2009 04:09:55 PM · #32
s'more:

pinhole format gallery
pinhole photo gallery
Stonehenge by pinhole
Without Lenses
03/24/2009 04:27:40 PM · #33
Make your own pinhole
 03/25/2009 09:36:11 AM · #34
Come one, come all, join the Lensless Revolution!
 03/25/2009 03:08:27 PM · #35
okay, looking on ebay for a cap.

another question. for the drilled holes -- is smaller better, or does it matter? I only ask because my husband ( nards656) is a mech. eng. at a machine shop and has the ability it as small as i would like. likewise with the metal disc. is th
 03/25/2009 03:41:54 PM · #36
okay, put my name on the list for this grand experiment. i'll start as soon as i get my cap and hubby drills it for me. heck, maybe i'll be famous someday. har har har
 03/25/2009 03:59:54 PM · #37
Yay! as far as the size of the hole, that depends on the distance to your sensor, I think - you should be able to find size suggestions on some of those "make your own" links we mentioned before, and I'll see if I can't scare up something particular for your 30D.
 03/25/2009 04:01:57 PM · #38
pinhole size calculator
 03/25/2009 04:04:06 PM · #39
precision drilled pinholes
 03/25/2009 04:10:41 PM · #40
yet another pinhole calculator

there should be a little line with a circle through it somewhere on the top of your camera body, which indicates where the sensor is - the distance between that and the body cap is what you can enter into the "depth of camera" field, I believe, and the calculator will do the rest
 03/25/2009 04:56:11 PM · #41
The calculators are interesting. I know the diameter of my pinhole but how do you determine focal length or camera depth?
 03/25/2009 05:40:26 PM · #42
Originally posted by krnodil:
yet another pinhole calculator

there should be a little line with a circle through it somewhere on the top of your camera body, which indicates where the sensor is - the distance between that and the body cap is what you can enter into the "depth of camera" field, I believe, and the calculator will do the rest


I always wondered what that was and never bothered to check..huh.
 03/26/2009 10:32:23 PM · #43
bump to see if there's any more people who want to sign on...
 03/27/2009 10:15:17 AM · #44
My spare body cap has been shipped. If my husband gets to go to work next week, I should be able to get started. :)
 03/28/2009 03:04:07 PM · #45
looking forward to it... I may only have time to submit a few, but any/all of my Challenge entries in April will be pinhole.
 03/30/2009 09:05:05 PM · #46
It's nothing profound, and I knew what I was getting into entering a pinhole shot in a "serious" challenge. But in the spirit of the upcoming side challenge, I thought, what the hell...


And it finished #5 overall of all pinhole entries (!). That doesn't say much, but still...

So bring on the side challenge!
03/31/2009 09:12:28 AM · #47
I'm not sure how many participants might be enjoying April 1st already, so I don't know if I'll be inconveniencing them by starting the image thread about 12 hours from now (about 9PM EST) - which is still March 31st for me. :) Hang in there, it'll happen soon enough.
 03/31/2009 05:24:37 PM · #48
Dont plan on submitting an image daily this month but hope to upload a dozen or so images. And, of course, I guess we will all be saving our best image for the April Free Study?
 03/31/2009 05:40:02 PM · #49
Originally posted by krnodil:
I'm not sure how many participants might be enjoying April 1st already, so I don't know if I'll be inconveniencing them by starting the image thread about 12 hours from now (about 9PM EST) - which is still March 31st for me. :) Hang in there, it'll happen soon enough.


Well I think that is blatant datism and I intend to make a complaint to the UN Commission on Human Rights. You are denying us access to the calendar on the basis of our longitude. Just another disgraceful example of Americocentric arrogance. And you can't play cricket or proper football, either, so there. You'll be hearing from whichever African despot is currently the UN's Chair of Human Rights.
 03/31/2009 05:58:13 PM · #50
Originally posted by ubique:
Originally posted by krnodil:
I'm not sure how many participants might be enjoying April 1st already, so I don't know if I'll be inconveniencing them by starting the image thread about 12 hours from now (about 9PM EST) - which is still March 31st for me. :) Hang in there, it'll happen soon enough.


Well I think that is blatant datism and I intend to make a complaint to the UN Commission on Human Rights. You are denying us access to the calendar on the basis of our longitude. Just another disgraceful example of Americocentric arrogance. And you can't play cricket or proper football, either, so there. You'll be hearing from whichever African despot is currently the UN's Chair of Human Rights.


My humble apologies, dear sir; would you accept as a concession the ability to post two images in your first contribution to the image thread? I certainly hope sanctions aren't in order... :D
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