Classified and illustrated price-list and catalogue of photographic lenses, cameras, apparatus, and materials : made, imported and sold wholesale and retail by James WQueen & Co . p-157. IT is always difficult, especially when working with a small stop, tcdecide just when an object is in the best focus with the eyealone. For this cause the focusing glass is almost as necessaryas a camera, if fine, sharp work is to be done. It is adjustable either by screw or slip-tube, and should be placedagainst the back of the ground glass plate before attempting to focusa view, and adjusted so as to show th
Classified and illustrated price-list and catalogue of photographic lenses, cameras, apparatus, and materials : made, imported and sold wholesale and retail by James WQueen & Co . p-157. IT is always difficult, especially when working with a small stop, tcdecide just when an object is in the best focus with the eyealone. For this cause the focusing glass is almost as necessaryas a camera, if fine, sharp work is to be done. It is adjustable either by screw or slip-tube, and should be placedagainst the back of the ground glass plate before attempting to focusa view, and adjusted so as to show the ground glass surface sharplywhile still pressed against the back of the plate. Then set it rigidlyat this focus by clamping it, or otherwise, and when using it on theview afterward, simply bring the objects to a sharp focus in thefocusing glass by moving the camera lens or body in or out, withoutderanging the adjustment of the examining lens. No. p-155. Three-legged Focusing Glass, . p-156. Plain p-157. Queen & Cos Pkice.• $0 75 75 . 2 50 James W. Queen & Co., Philadelphia. QUEEN & VIEW COMPOSITORS. 29. VIEW COMPOSITOR. ^pHIS is a little instrument similar in general appearance to aX single tube opera-gass, but including an angle of 300 to 45°,according to the extent to which it is drawn out. It issupplied with a blue glass, which shuts off all the rays exceptthose which will impress the sensitive plate, so that one can see justhow the picture will appear when taken. It is very useful in selecting a view and in arranging the fore-ground, as any imperfections are far more noticeable in it than theywould be to the eye alone. No. View Compositor, each, $6 00 QUEEN FOCUSING CLOTHS. tyO shield the ground glass from light while adjusting the focus ofX the lens upon it. The Queen Focusing Cloth is a doubleweight gossamer. It will be found most desirable when usedfor the purpose it was designed for. No. p-162. Queen Focusing Cloth, 36x36 inches square, . $0 60 30
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectopticalinstruments
