Homebrew PCBs

Stefan Trethan wrote:

> 
> On Sun, 09 Jan 2005 14:01:00 -0000, gettingalongwouldbenice  
> <gettingalongwouldbenice@...> wrote:
> 
> 
>>I think projection of the alignment marks is always gonna be easier
>>than trying to project an image of the work.
>>mike
> 
> 
> 
> Yes, it will be easier, but IMO much less useful for what i want to do.
> It doesn't magnify the image, so you need a magnifier or something anyway.
> 
> The commercial units do what i plan to do, so i will try that first.
> 
> 

Do you what the basic arrangement of the optics should be ? I  did a 
very simple experiment with some odd lenses I have (from microscope eye 
pieces). Trying to get any kind projection seemed futile.
I tried both convex with flat and double convex lenses. The projection 
screen was transparent plastic film with diffuse coating. I could not 
get any close range image projected into the screen any any amount of 
light. The only way I could see reasonable images was looking at objects 
at infinite distance, or greater than few meters distance.

If my thinking is correct, wouldn't a converging lenses need some type 
of very small aperture to get a sharp image projection ?

Adam