Qus on PinHole

Lord_Angelus · 13th January 2007

I did the hole on the cardbound and it is over my cam. But how to make the photo out? i shot but the photo somehow come out very blur.

And I Just maked a pinhole from a box. Take how long for the photo to be "shot"? Left the box there for 1 min? or 2mins?

The_Cheat · 13th January 2007

There are a number of factors to consider in getting a sharp pinhole:

1. the size of the pinhole (i.e. f number)
2. the distance between the pinhole and the film (i.e. the focal-length)
3. the format of the light sensitive material (i.e. the coverage of the scene)
4. the make of the material containing the pinhole (paper or metal, the thickness of the material, the smoothness and evenness of the hole, the light-proof or reflective capability of the material)
5. the subject (usually hyperfocus is used, so most subject that is not within the hyperfocal distance will definitely be blur)
6. the exposure

In order to do precision pinhole photography, it takes a lot of trying and adjustments, as well as a good understanding of exposure.

There are calculators around the web to calculate the size of the pinhole, e.g. Pinhole Camera Calculator However, getting the f-number is just the first step. You need to know what kind of light you're getting to decide on the time of exposure, and that would be easiest on the light meter. And since the exposure would probably be longer than 1s, you would need to know the compensation factor for a lengthen exposure of the scene. Only knowing that would you know what kind of exposure is the correct one.

Frankly, unless you're doing fine art, forget about calculating all these things. Just try one scene... make sure the subject is at a distance at hyperfocal range, and give it a relatively long exposure. Get the image first, and then try and do adjustments from there.

TrailsofLife · 13th January 2007

Hi,

Check out this website, Mr PinHole. The info you need to build a pinhole camera is all there.

Lord_Angelus · 14th January 2007

lol. I "try" pinhole on my 20D and 30D cam lol

The_Cheat · 14th January 2007

Originally Posted by Lord_Angelus

lol. I "try" pinhole on my 20D and 30D cam lol

In that case, make sure that the pinhole is well-made. Get a laser drilled one on metal piece if possible. Holes created by pin will bound to be uneven and would prolly not give the sharp sharp image that you may see around the web...

Lord_Angelus · 14th January 2007

20D

30D

sob!

The_Cheat · 14th January 2007

Dust on sensor?

Anyway, i'd had clearer images poking needle through an aluminium can. Just cut out a small piece of aluminium from coke can, and use a needle to slowly poke through. Then use a fine sand paper to sand both the front and back. Then if possible, cut a hole on the body cap of the DSLR (get extra body caps if you need to), and stick the piece of aluminium foil on it. This would probably give you a much clearer image than the cardboard.

The problem with using cardboard is that it is a bit too thick, and the hole create would tend to be uneven. Since light will enter via the hole through every possible angle, having an uneven hole through a thick surface would inevitably cause light to enter unevenly, thus having more blurness than deemed viable.

alvinsclee · 14th January 2007

You may get some ideas here...
http://forums.clubsnap.org/showthrea...=239702&page=2

I'll try the acupuncture needle method as soon as I have time away from my ever-increasing workload.

ETboy · 19th January 2007

Originally Posted by The_Cheat

In that case, make sure that the pinhole is well-made. Get a laser drilled one on metal piece if possible. Holes created by pin will bound to be uneven and would prolly not give the sharp sharp image that you may see around the web...

where can i get a laser drilled pin hole ?

The_Cheat · 19th January 2007

Originally Posted by ETboy

where can i get a laser drilled pin hole ?

Ebay sells laser drilled hole.

13th January 2007	#1
Lord_Angelus Member Join Date: Jan 2005 Location: Singapore Posts: 1,002	Qus on PinHole I did the hole on the cardbound and it is over my cam. But how to make the photo out? i shot but the photo somehow come out very blur. And I Just maked a pinhole from a box. Take how long for the photo to be "shot"? Left the box there for 1 min? or 2mins?

13th January 2007	#2
The_Cheat Senior Member Join Date: Jan 2004 Posts: 2,263	Re: Qus on PinHole There are a number of factors to consider in getting a sharp pinhole: 1. the size of the pinhole (i.e. f number) 2. the distance between the pinhole and the film (i.e. the focal-length) 3. the format of the light sensitive material (i.e. the coverage of the scene) 4. the make of the material containing the pinhole (paper or metal, the thickness of the material, the smoothness and evenness of the hole, the light-proof or reflective capability of the material) 5. the subject (usually hyperfocus is used, so most subject that is not within the hyperfocal distance will definitely be blur) 6. the exposure In order to do precision pinhole photography, it takes a lot of trying and adjustments, as well as a good understanding of exposure. There are calculators around the web to calculate the size of the pinhole, e.g. Pinhole Camera Calculator However, getting the f-number is just the first step. You need to know what kind of light you're getting to decide on the time of exposure, and that would be easiest on the light meter. And since the exposure would probably be longer than 1s, you would need to know the compensation factor for a lengthen exposure of the scene. Only knowing that would you know what kind of exposure is the correct one. Frankly, unless you're doing fine art, forget about calculating all these things. Just try one scene... make sure the subject is at a distance at hyperfocal range, and give it a relatively long exposure. Get the image first, and then try and do adjustments from there.

13th January 2007	#3
TrailsofLife Senior Member Join Date: Jul 2004 Location: Singapore Posts: 8,492	Re: Qus on PinHole Hi, Check out this website, Mr PinHole. The info you need to build a pinhole camera is all there.

14th January 2007	#4
Lord_Angelus Member Join Date: Jan 2005 Location: Singapore Posts: 1,002	Re: Qus on PinHole lol. I "try" pinhole on my 20D and 30D cam lol

14th January 2007	#6
Lord_Angelus Member Join Date: Jan 2005 Location: Singapore Posts: 1,002	Re: Qus on PinHole 20D 30D sob!

14th January 2007	#7
The_Cheat Senior Member Join Date: Jan 2004 Posts: 2,263	Re: Qus on PinHole Dust on sensor? Anyway, i'd had clearer images poking needle through an aluminium can. Just cut out a small piece of aluminium from coke can, and use a needle to slowly poke through. Then use a fine sand paper to sand both the front and back. Then if possible, cut a hole on the body cap of the DSLR (get extra body caps if you need to), and stick the piece of aluminium foil on it. This would probably give you a much clearer image than the cardboard. The problem with using cardboard is that it is a bit too thick, and the hole create would tend to be uneven. Since light will enter via the hole through every possible angle, having an uneven hole through a thick surface would inevitably cause light to enter unevenly, thus having more blurness than deemed viable.

14th January 2007	#8
alvinsclee Member Join Date: May 2006 Location: Redhill, Singapore Posts: 346	Re: Qus on PinHole You may get some ideas here... http://forums.clubsnap.org/showthrea...=239702&page=2 I'll try the acupuncture needle method as soon as I have time away from my ever-increasing workload. __________________ * Take only pictures, leave only footprints, kill only time... and live a life! * :) Alvin Last edited by alvinsclee; 19th January 2007 at 10:44 PM.