Homebrew PCBs

One thing you must take into account is chromatic abberation. So if
you just make this using a simple lens you may run into problems of
fuzzy edges even at the best focus. I'm a novice in such matters so
perhaps someone here can provide more info on that.

Long ago I thought about modifying a Polaroid instant camera for
this purpose. The idea was to make the artwork at 4x size. Then put
the shutter on a timer. Load the sensitized board into a holder and
insert into the camera. I'd have the auto-eject disabled, though.
One limitation is the quality of the camera, you'd have to use one
that is not fixed focus.

Steve Greenfield

--- "jackafaz <greeneaz@...>" <greeneaz@...>
wrote:
> Hi,
> 
>     As  a fun project I thought I would build a Large Format
> Camera 
> to use for 2:1 reductions of artwork for PCB's. I bought a book
> From 
> Lindsay " Simple Large Format Camera Construction" by Edward A. 
> Hover.  It looks like a straight forward project and not very 
> dificult. My problem is that I know nothing about what type of
> lens ( 
> other than it needs to be a large format type) to use. I did a
> search 
> on eBay and there seem to be a number of different types that
> could 
> be purchased for a reasonable amount if they would work. I would
> sure 
> appreciate it if someone could point me in the right direction.
> The 
> camera will be dedicated to doing 2:1 reductions only and in a
> fixed 
> location which, I assume make it a simpler problem. Also, do I
> need 
> to use a special film?
> 
>     Thanks - Jack

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