Continuing my posts on how to simply reproduce slides and negatives (see earlier post Scanning Black and White Negatives,) I thought I’d be brave enough to show you my awkward rig for using a film camera lens to reproduce a color slide or negative. If you haven’t got a macro lens zoom for your camera, this will allow you to get close enough to the slide to give you a high resolution image. I admit the rig looks rather flimsy here, but it actually works extremely well. You’ll need a screw mount lens (the tele photo works best for me, but a regular lens will too,) a light table, and in this case a couple of cardboard tubes @ 1.75 inches in diameter (these came from rolls of toilet paper.)
Cardboard tube and lens
The focus ring on a screw mount lens won’t operate unless it’s attached to a camera, however, it will allow you to move very close to an object to get it into focus without having to use the ring. Hold one up to your eye and move your other hand close until it comes into focus, and you’ll see what I mean. If you have a lens like these with an old film camera, you can use it with a digital camera to get the slide to fill up the whole frame of the picture. Without a macro lens you won’t be able to fill the frame with the slide image, which reduces the potential resolution. This rig will work with any type of camera.
The first thing you need to do is determine how far from the slide the camera needs to be to get the slide into focus. I place the slide on the light table, hold the lens to my eye, and move forward or back until it comes into focus. A regular lens (such as my 49mm) needs to be about .5 an inch away, and the telephoto (mine is a Sigma Mini-Tele 135mm) is about 7 inches away. I take two pieces of tubing and tape them together at that height. I tape some thick paper sheets around the slide to mask out the light from the table except for the film area, place the lens on the tube and set it over the slide. Now I’m ready to shoot.
Lens placed on tube
I have two digital cameras, one is a 6MP fixed lens, the other a 10MP digital SLR. I actually prefer the 6MP camera in this case since the small lens opening fits on the screw lens opening more easily. I zoom the camera out to its highest optical setting (for this camera that’s a 3X zoom,) hold it steady to the lens on the tube, and take the picture. The flimsy tube is a tight fit to the slide, so an improvement would be a tapered tube that has a slightly wider bottom but still fits the lens at the top. A box that is high enough would also work if I cut an opening for the lens, but for now this will do fine.
Photographed slide example
In the photo above is an example of a slide taken a few years ago in San Francisco. Superimposed in the upper left corner is a shot made with the same camera as close as it allows me to get without this rig, and you can see the difference in sizes (Note: this image is reduced from it’s original size of 2803 x 1990.) The difference is between roughly a 1MP image and a 6MP image. Although most of these fixed lens digital cameras only save in JPG format, including mine, there are some new ones out now that also support RAW and have a larger color sensor for better quality files.