I have been looking for an InGaAs camera specifically useful for Panoramic Infrared Reflectography.
I currently own an Indigo System camera 320×256 pixels which does its work pretty well. I would like to upgrade to a 640×512 pixels camera, the advantages being obvious: bigger images mean less stitching. I don’t plan to buy a new camera somewhat soon, since these cameras are pretty expensive. Though, I am exploring the market since I have been asked for advices by other professionals who want to develop a panoramic infrared reflectography system. So, I asked Xenics to let me test their camera.
Pigments Checker is for photographers, conservators and scientists interested in technical documentation of paintingss. It has 54 swatches of historical pigments designed for infrared photography, ultraviolet photography and other technical photographic methods for art examination. Check it out!
Pigments Checker is a collection of 54 swatches of historical pigments that have been applied using gum arabic as a binder on a cellulose and cotton watercolor paper, acids and lignin free. This paper is not treated with optical brighteners, it’s slightly UV fluorescent, and it reflects IR. Two cross-hair lines, 0,2 mm (vertical) and 0.4 mm (horizontal) are printed on each swatch of paper before the application of paint, in order to have a means to evaluate the pigments’ transparency in the IR and IRR imaging. Among all the pigments and their varieties ever used in art these pigments collection select the most used ones from antiquity to early 1950’.
First of all, I asked Xenics since it is an European company, based in Belgium. I’m now based in Europe so I like and I need to deal with European companies. We are neighbors and it is much easier and affordable to ship things back and forward. I did actually bought already a Xenics camera in 2008 for CISA3 while I was visiting researcher at University of San Diego California. It was an InGaAs 320×256 camera. I was pleased with the company’s customer assistance for some issues we had with the software, so I emailed their headquarter in Leuven, Belgium to see if I could get one of their new camera to be tested.
Indeed, it went better than I hoped and I get their newest camera! And also the 640×512 ones. It’s called Bobcat 640. A number of features make this camera a perfect much for Panoramic Infrared Reflectography.
- Impressive High Sensitivity. At its longest acquisition time of 40 milliseconds I didn’t even had to turn the halogen lamps on. Just the light sunlight was enough even with a 200mm lens mounted. I posted already on screens to reduce the heating from halogen lamps. The use of this camera makes the examination absolutely safe since it does require a ridiculous small amount of lighting.
- Lightweight and small. This camera waits just 470gr (with its 25mm SWIR lens on). This is extremely less than my Indigo, 1640gr. This difference in weight is not just esthetic. It becomes relevant in Panoramic Infrared Reflectography since we can apply less weight to the panoramic head, at all advantage of its stability. Xenics Bobcat is also extremely small (55x55x85 mm). This also helps to better arrange the camera and the telephoto lens on the panoramic head.
- Frame grabber. The camera is connected to a PC with a LAN cable which port is present in any laptop. So, on your laptop screen you have a live view streaming from the camera and the images can be saved directly on the laptop without the need of a frame grabber. I did use my ARDUINO chip to automatize the acquisition process with the Gigapan Pro Panoramic Head.
- Pixel count. The Xenics Bobcat 640×512 has roughly 4 times more pixels of the 320×256. This translate in higher resolution, bigger images and less stitching.
As an example, look at the images taken for the Madonna and Child, Ingels Collection, Sweden.