The "Davon" Micro-Telescope
"It's a dessert topping. No, it's a floor wax!" What idiot would argue the legitimacy of a simple microscope's presence here, were it not for the fact F. Davidson & Co. sold this thing (in part) on the basis of its use as a photographic device. The brochure illustrates examples of high magnification photographs taken with this unique (circa 1920) micro-telescope. Operation as a microscope was as one may expect. where the Davon differentiated itself was in the addition of telescope adaptors, which were inserted in a socket under the stage. Equipped with a choice of telescope adapters, the degree of magnification was impressively high. The unit installed for the photo here was a special photographic piece, with built in adjustable diaphragm. Light gathering was less than impressive, so stopping down consid erably, while it may have helped sharpness, would likely extend exposures to excess. I have little information on exactly how the sample photographs in the book were created, so my example below is probably not up to the equipment's full potential.
我理解的意思是，这是一个特殊的摄影设备。前端是一个望远镜，将远处物体放大到显微镜的标本位置，再经过显微镜进一步放大。相当少见的特殊镜头。应该归类到摄影设备中。 |
置顶卡
变色卡
千斤顶
显身卡
