work of DIY pinhole camera

[zhoufang]

focal length: 7cm radius
film size: 6X9cm
apeture: 0.33mm f/210
film: Fujifilm RDP III
digitized by canon S50


sharpend image


without USM


this is the camera that take the above photo

[zekai]

cool. very nice setup. i am impressed with what a basic set up can do

[darkspade]

How about this for a pinhole camera

http://www.cameratruck.net/

[TME]

Wow!! USM can do so much to sharpen the image? Hmm.....

BTW, was the blurness inherent to pinholes or is it bec u didn't use a tripod?

Was the cam homemade? I'm curious how u loaded the film? Using the usual canister or did u roll your own film?

Thanks!

[TME]

Originally Posted by darkspade How about this for a pinhole camera http://www.cameratruck.net/

Man that is cool and real brave. But they've got social security over in US.....

[XXX Boy]

Yeah, the black box sure looks dangerous! I think if you wanna bring it aboard, the customs officers will extra check your little black box!
But it is great to see u can have nice pictures taken by it!

[zhoufang]

Originally Posted by TME Wow!! USM can do so much to sharpen the image? Hmm..... BTW, was the blurness inherent to pinholes or is it bec u didn't use a tripod? Was the cam homemade? I'm curious how u loaded the film? Using the usual canister or did u roll your own film? Thanks!

yes, the blurness is inherent to pinholes bcos they do not use a lens.
The exposure time for the above photo was about 40sec (notice the trail of red light at the right of the photo) , and tripod is a must.
f/210 is is more than 10000 times dimmer than a f/2 fast lens, thus the exposure time is always count in seconds even under bright sunlight.

the film used is of 120 median format. method of loading 120 film can be found on the net if you are interested. In my pinhold the loading is a little unconventional bcos the film is loaded from the from of the camera
[IMG]www.zf.homelinux.com/pinhole/product/0027.jpg[/IMG]
please note that the small hole at the back is a ruby window that assist positioning the winding of the film as on ancient 120 camera and it is not the pinhole that does the imaging.

For those of you worried about its look, you are right!
when I mount the camera on tripod and take photo on street the head turn rate is almost 100%.

[junyang]

How do u calculate the exposure time? Care to share? Im in the process of building something like this..

[TME]

Originally Posted by zhoufang yes, the blurness is inherent to pinholes bcos they do not use a lens. The exposure time for the above photo was about 40sec (notice the trail of red light at the right of the photo) , and tripod is a must. f/210 is is more than 10000 times dimmer than a f/2 fast lens, thus the exposure time is always count in seconds even under bright sunlight. the film used is of 120 median format. method of loading 120 film can be found on the net if you are interested. In my pinhold the loading is a little unconventional bcos the film is loaded from the from of the camera [IMG]www.zf.homelinux.com/pinhole/product/0027.jpg[/IMG] please note that the small hole at the back is a ruby window that assist positioning the winding of the film as on ancient 120 camera and it is not the pinhole that does the imaging. For those of you worried about its look, you are right! when I mount the camera on tripod and take photo on street the head turn rate is almost 100%.

Of course when u walk around with that huge box! I thought it was a 35mm format pinhole.... didn't know that it was medium format!

[zhoufang]

To TME,
in the 1st post I have stated - film size: 6X9cm
you must have missed that

To junyang,
since I don't have a dedicated light meter, I used a SLR as one.
turn to aperture priority at F/16.
since the pinhole is f/210, do the maths:
(210/16)^2=172
so I multiply the exposure metered from the F/16 by 180.
eg: when get 1/60 sec in the SLR the exposure for the pinhole will be 3 sec.
that's the theory, in practice I use the SLR more like a spot meter rather than just take one reading from it.

[TME]

Hi zhoufang, I really did miss that out.... was captivated by the picture quality actually.... thanks for pointing out.