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From: rstevew@armory.com (Richard Steven Walz)
Subject: Re: DRAM's & CCD's, idea
Organization: The Armory
Date: Thu, 25 Aug 1994 06:51:13 GMT
Message-ID: <Cv2wDI.DBG@armory.com>
References: <R.F.Pointon.23.000F85D5@massey.ac.nz> <weathersd.6.000FD44A@metro.or.gov>
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In article <weathersd.6.000FD44A@metro.or.gov>,
Doug Weathers <weathersd@metro.or.gov> wrote:
>In article <R.F.Pointon.23.000F85D5@massey.ac.nz> R.F.Pointon@massey.ac.nz (Robert Pointon) writes:
>
>>Hi all,
>
>>Hows this for an idea... 
>> Remember how we made those pin hole cameras at school ?
>> No lenses, just a pin hole to focus the light on the film...
>
>>The point of this is - 
>>  If you use a mil-spec DRAM (ie metal lid), and you made a
>>  tiny pin hole in the lid....
>
>>Advantages -
>>  No lenses - less weight,etc.
>>  Don't actually have to remove the lid.
>>  Simple.
>
>>Disadvantages -
>>  Not as well focused, maybe.
>
>>I haven't tried it, but what do you people think?
>
>>Any optical/physics type person like to comment ?
>
>I am not an optical or physics type person, but I can think of one drawback.  
>I think that pinhole cameras require a relatively long focal length, which 
>won't be available if your pinhole is poked into the top of your chip.  
>
>The focal length of the perforated DRAM pinhole camera will mean that it will 
>only be able to focus on things VERY close to the chip, and the image will 
>only cover a few pixels.
>
>>bye,
>>Robert
>--
>Doug Weathers, Net Guy  |   The above opinions are     |   On a clear disk
>weathersd@metro.or.gov  | probably not those of Metro  | you can seek forever
-----------------------------------------------
Actually a pinhole camera is in focus at ALL distances. If the pinhole is 
sufficiently distant from the cells, then it can enter all in the focal
cone of interest. Problem: Shitty amount of light per cell. Perhaps not
enough for ANYTHING! That's a physical certainty. I DID take the ipper
division physics optics and E&M course, as well as separate formal optics.
-Steve Walz   rstevew@armory.com

