We just tested Coastal Optical 60 mm lens on our Nikon D800 for technical photography (visible, ultraviolet fluorescence, ultraviolet reflected, infrared) and infrared reflectography. This is an apochromatic lens in the range 310-110 nm. Indeed, the lens didn’t need any refocusing while shooting technical photos in the UV, VIS and IR region. It really resulted sharply apochromatic. Coastal Optical Apo Macro 60mm lens is a superb lens for visible and macro photography and consequently for UV fluorescence (UVF). At CHSOS we were more interested to evaluate its performance in UV reflected (UVR) and Infrared (IR) to spot any difference. The technical photos were comparable with those acquired with standard lenses but with the relevant advantage that no refocusing was needed. Another advantage of an apochromatic lens is that the creation of infrared false color images is straightforward since no registration is necessary between VIS and IR images. The lens was also checked for hotspots in the infrared and test data enriched the Infrared Photography Lenses Database. No hotspot even at the highest F-number was noticed.This property qualify this lens for infrared photography but also for panoramic infrared reflectography since it can be stopped down in order to increase the depth of field without causing hot spots. Of course, this is also a perfect lens for multispectral imaging (bandpass interferential filters). Its only drawback, very expensive.
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’.