Re: CHEAP digital camera???

Thanks for the comments Jon,

I suspected as much. Oh well, guess I'll just have to find the external
attachment. I do have a cold light head (8" dia), which might work
better then the "mirror box" HP supplied for 35mm. At least I could get
6x6. However, considering your comment about brightness, I doubt if it
would have enough light.

I'm still impressed with your photo plotter!

Alan KM6VV


Jon Elson wrote:

>
> Alan Marconett KM6VV wrote:
>
> > Hi Jon,
> >
> > Yeah, I meant 60 x 60 MM. Also called 2 1/4 x 2 1/4. Although I was
> > once considering view cameras, nothing THAT big!
> >
> > I just had a thought, could an enlarger "project" an image of a slide or
> > negative onto a scanner? Might need to disable internal lamp? That
> > might give me a full scan.
>
> No, in general, it won't work. The scanner expects a real image at the
> surface of the plate you put the paper on. If the enlarger was projecting
> an image on that plane, I guess that would constitute a real image, but
> it would have the wrong collimation, and the scanner would lose about
> 90% of the light. Have you seen how bright the scanning lights are?
> They are hard to look into, at least mine is painfully bright. So, I don't
> think it would work, unless you have a 1000 W Xenon lamp in your
> enlarger. OK, now I know why it won't work. The scanner has a really
> tiny lens just in front of the line-scan CCD, and a moving mirror that
> brings a slice of the page into view. The enlarger projects a virtual
> image, not a real image, and most of it will not hit that lens at all.
> You could rear-project onto a frosted film with mediocre results,
> or redo the entire optics to eliminate the virtual image.
>
> There might be a way to modify a page scanner to make it work.
> You could rip out the scanning drive, and attach it to the film holder
> in the enlarger, so it makes a proportionally smaller movement of the
> 35 mm slide. Using some non-spherical optics, set up the enlarger to
> condense the light onto a narrow line on the slide, projecting about a 1/16"
> wide strip of the slide onto a small area, through a much shorter FL
> lens than you would normally use. Then, the line-scan CCD is placed
> at the right position to recieve the real image. The tricky stuff is that
> you would be projecting a 30 mm image strip onto a 20 mm line-scan
> CCD. That could take some REALLY short FL lenses, or several
> lenses. Actually, 2 20 - 40 mm lenses back-to-back might work out
> pretty well.
>
> Anyway, you can't just put the scanner on the table under the enlarger
> and scan it, unfortunately!
>
> Jon