Amateur Cine World (January 1936)

M>r. compensation is quite possible, it sometimes has an effect on the colour rendering, so that if you can find the exact rather than approximate exposure it is an advantage. USING FILTERS. I may be going to Switzerland this winter, where I propose to use my cine camera. I imagine that a fair exposure for bright snow scenes would be f/16, using Kodak 5.5. film. In your scheme the high-light reading would be 3 x 16, £/48, but my Avo exposuremeter only registers up to f/32. Is there any application of your rule I could use ? Would it be practicable to hold up a black and white chequered card in front of my meter to determine exposure for snow scenes ? L. C. V. MIEVILLE. Rustington, Sussex. If your meter goes up to f/32 there are two possible ways of getting over the difficulty. The first is to use a neutral density filter in front of the exposure meter which removes 90 per cent. of the light. This done, the actual meter reading on high lights would, of course, give the correct aperture for the camera. It will also be possible to use a card which only reflected one tenth of the light reaching it, although the angle at which the card was held would probably have some effect on the value of exposure. I think you have partly misunderstood the high-light exposure system, since the actual aperture given of the meter on the high light must be divided by three and not Smethurst Repl multiplied by three. Thus, if our meter reading was f/32 you would actually use f/1o. The neutral density filter could be obtained from Ilford, or from any other photographic firm. It you got a gelatine one Proscenium of studio of Hyde C.S. The side openings and shield are illuminated from behind. _ Music is contrclled from the operating box, the speaker being behind the screen. There is accommodation for about 60. it would be advisable to bind it up between glass to make certain it does no damage. DIFFERENT SUBJECTS IN SAME LIGHT. ; I am indebted to you for your article on exposure. It explains some unexpected “‘ under-exposed ’’’ results when using my exposure meter. Wouldthis new method give the same lens aperture to different subjects in the same general light ? I tind that my meter readings vary considerably according to even minute changes of direction, according to the background, yet a white object near to the camera (or meter) would not accurately record the high-lights of the comparatively dark subject. How is the true high-light found? This difficulty may be more apparent than real, but if you are writing further on the subject an answer to this point would help. Kilmarnock. R. H. GEorGE You are not the only reader who has been troubled by this curious and apparently contradictive question of highlights. The trouble is that it is necessary to consider just what you want as a screen picture. Take (1) Landscape with sky; (2) landscape with no sky. In (1) you use the sky as a_ high-light—also in (2). If you took the lightest point of the subject in (2) and used it, you would give far more exposure and the whole scene would enlighten up on the screen. Consequently it would not match with (1) at all. Yet at times it may be absolutely essential that a landscape without sky should be brightened up and in this case the actual high-light would have to be found. My own feeling is that though it is simple and convenient to use people’s faces and (Continued on page 481) ante ee AT LAST An Electric Exposure Meter which DOES fit the vest pocket. For all CINE CAMERAS also for ‘STILLS’ PRICE ONLY £3/3/0 Leather case 5/extra The “ PRINSEN” Electric Exposure Meter The ‘‘Prinsen”’ is the smallest and simplest electric exposure meter. Guesswork is entirely eliminated by the ‘“ Prinsen,’’ which is both remarkably accurate and extremely simple to use. The reading is direct for ANY stop and ANY exposure. If YOU wish to be sure of giving absolutely correct exposures in all lights and at all times you can be certain of doing so with the “‘ Prinsen.”’ Obtainable from all Photograghic Dealers SANDS HUNTER & Co., Ltd., 37, Bedford St., Strand, W.C.2. 479 FREE TRAVEL FILMS The Canadian Pacific has pleasure in announcing a new series of Travel Moving Pictures, featuring Canada, steamship life, cruises etc., which will shortly be available for borrowing. The size is either 35mm. or 16mm., both silent and with sound. Under certain conditions, these films may be borrowed free. You are invited to send for the descriptive circular, addressing Publicity Department, CANADIAN PACIFIC RAILWAY, World’s Greatest Travel System, 62-65 CHARING CROSS, LONDON, S.W.1. ms