Re: confusion re: pinholga

Not sure what you mean by test results. I just did the math as Paul
suggested.

I can't get 120 color film processed here--I have to mail it off--so
this morning I shot some 35mm in the pinholga, assuming that the
aperture is f/199. When I get that back, if it looks good, maybe I'll
assume that is the aperture. Maybe you're right too that it won't make
that much difference, even for long exposures, whether I use a factor
of 10 or 12.

--shannon

On May 23, 2007, at 9:29 AM, Thom Mitchell wrote:

> The difference between f199 and f215 is roughly a 1/3 of a stop, if I
> did my math right. Which is shouldn't be significant given the length
> of the exposure. Maybe their suggestion will allow for slightly
> denser negatives and account for any fall-off that might exist with
> the Holga. What did your test results determine the aperture to be
> "exactly"? -thom
>
> Shannon Stoney wrote:
>> OK, I did that, and got f/199, just like the Pinhole Designer
>> software said. Wonder why the Holga Mod guy says it's f/215?
>>
>> About the fuzziness: I have another pinhole camera that makes pretty
>> sharp images. I thought that if the pinhole was the optimal size for
>> the focal length, you were supposed to get relatively sharp images,
>> compared to images where the pinhole is not optimal. (Sharp for a
>> pinhole camera that is.)
>>
>> --shannon
>>
>>
>> On May 22, 2007, at 11:59 PM, paul beard wrote:
>>
>>> On May 22, 2007, at 9:06 PM, Shannon Stoney wrote:
>>>
>>>> The website says that the pinholga has an aperture of .0079" or .
>>>> 2010mm, and that is f/215.
>>>
>>> To find the f/stop, divide the focal length by the aperture. for
>>> instance, I have a camera with a 118 mm focal length and a .4mm
>>> aperture. That gives me an f/stop of 295. With a FL of 40 and an
>>> aperture of .2, I make it about f/200.
>>>
>>>> So I am wondering: are my images going to be sort of fuzzy because
>>>> the pinhole is not the optimal size?
>>>
>>> Well, they are pinhole images ;-)
>>> --
>>> Paul Beard
>>> words: http://paulbeard.org/wordpress
>>> pictures: http://www.flickr.com/photos/pdb206/
>>> Are you trying to win an argument or solve a problem?
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Received on Wed May 23 08:10:09 2007