Yes all that make a lot of sense. If one used a a computerscreen as backlight as I have seen some interest for one could at least easily try it by drawing a white line one pixel row at a time. It could be interesting to try I am just throwing some ideas around
Throwing ideas out there is a very good thing! Even if it's something the people don't check out immediately, it could turn out to be very useful down-the-road.
I have built a lightbox for flash. It works ok and is almost even but I am having trouble getting anything larger than 40x40mm even with my design. Ideally I would want something bigger so I can use the same backlight for full frame captures of a 6x7 negative or slide. Then If I need to i just move the camera closer and take a series of tiles. I started to look at dichroic light boxes. Could thhese be altered to have a flash as a lightsource?
What would be the best way to get a flash like speedlite really even across 6x7 is the question I guess.
I based my source on a De Vere light mixing box. The lighted area is approximately 250mm x 250mm.
A second approach without using condensers is to just increase the distance between the flash and the film. I do this by bouncing the flash off a white card which sits at a 45 degree angle right under the film. The flash is at the end of a cardboard tube about 1 meter away from the white card. The white card is a good diffusion source so reduces the dust and particle imaging compared to the condenser technique.
Nate Potter, Austin TX.
I googled quite a bit and could not find a good description on how a de vere box is constructed. It seems to involve two lightsources and a mirror plus some diffusor? Do you have a picture I could look at?
I am looking into a good way to do the flash at a distance but the best would be to have it a bit more compact than 1 meter away!
Thanks for the suggestions.
I'll take some pictures soon, both of a De Vere unit and of my light source.
Why can't we just adapt a standard lightbox previuosly used for viewing slides as a scanning platform mated together with a simple copy stand. They are color calibrated with a decent CRI number.
Previously, I had purchased a couple of Bowen Ilumitran side dupers used on ebay with the idea of using it to scan (with a DSLR), but never got around to setting it up.
http://krebsmicro.com/Canon_EFSC/index.html), then you can probably do what you like, but if you don't have that super-low vibration shutter, then you probably want to avoid timed exposures in the 1 second to 1/15th of a second range. Using flash correctly minimizes the problems with vibration, but there might be issues with consistency, although that hasn't been a problem for me so far.