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