International photographer (Jan-Dec 1935)

Twenty-six The INTERNATIONAL PHOTOGRAPHER May, 1935 MINIATURE CAMERA PHOTOGRAPHY (Continued from Page 13) "I ust the Sease No. 3 formula but first of all desensitize in the standard strength of Pinakryptol Green for two minutes. Then wash for ten minutes to get rid of the dye, and develop slightly longer than usual (25-30 minutes at exactly 65°F.). "The resulting grain is so microscopic that I have produced many enlargements five feet wide with no trace of visible grain, and I am inclined to think they would go twice that size." Purchasing Chemicals: Under this heading we are not going to discuss the various brands of chemicals available to the miniature camera photographer, but needless to say, the chemicals used for film processing should be bought in original packages, and only those supplied by reputable firms. To purchase unknown brands in bulk because of cheaper cost is poor economy ; the inferior chemicals may ruin the negatives. Some chemicals are supplied in different forms, and the photographer may be puzzled with the amount to use of the form he has on hand when the formula calls for another. Sodium carbonate, for example, is supplied by chemical manufacturers in three forms, which are as follows: 1. Crystals — with 10 parts of water, containing 37% of sodium carbonate. 2. Monohydrated sodium carbonate — crystals with one part of water, containing 85% sodium carbonate. 3. The dry particles — containing 98-99% of sodium carbonate. Sodium sulphite is supplied in two forms: Crystals and dry sodium sulphite. The crystals contain 50 % of the dry sulphite, that it can be supplied in the form of either, a powder, In purchasing boric acid the photographer will find granules, or crystals. The granular or crystal form should be chosen because of much quicker solubility. The FRANK C. ZUCKER NOTION PICTURE CAMERA SUPPLY, NEW MITCHELL SOUND CAMERA NOW ON DISPLAY We sell Simplex Portable 35mm Sound Projectors, Moviolas — also new and used Mitchell, B. b H., Akeley, DeBrie Cameras and Equipment. powder floats on top of the liquid and is difficult to dissolve. Reticulation: This detriment usually props up during warm weather and since summer is not very distant we will review the causes of reticulation so that the miniature camera worker will avoid having his films ruined in this manner. The usual cause of reticulation is the subjection of the film to widely different temperatures during its processing, such as being transferred from a warm developer to a cold fixing bath, etc. Since the tap water is usually used for preparing all the necessary solutions as well as being employed for the final washing of the film, it is advisable to take its temperature first, then maintaining all solutions at this temperature ; that is, if the temperature of the tap water is suitable, so that it will itself not have to be cooled. To keep the solutions in the tank at the proper temperature a water bath can be employed — the tank is placed in a small basin into which cool water is allowed to run. For this purpose a metal tank will serve the purpose better, than one of a bakelite composition, for the latter is a poor conductor of heat, whereas the metal tank will readily allow the solution in the tank to adjust itself, in temperature, to that of the water bath. However, if the solutions are cooled to the proper temperature before being poured into the tank, and no external means, as the use of a water bath, or ice being placed about the tank, is to be employed, then a bakelite tank is called for. Its poor heat conductive properties will prevent the temperature of the solution to rise rapidly. Another important point which is usually overlooked and which has been emphasized by a well known miniature camera worker, is that the film itself must be of the proper temperature before being placed in the developer. The latter may have been cooled to 65°F., and then when film which has been in a warm room (about 92° F.) is placed in the cool developer, reticulation will occur. It is necessary to first cool the film to the proper temperature. Another cause of reticulation reported by some amateurs is the use of too strong a hypo bath. Rolleiflex Photographers: The submission of prints to the Rolleiflex Salon should not be neglected by all owners of this popular camera. A Caribbean cruise is offered, as well as $300 in photographic equipment for those whose prints are selected to receive awards. Full details on the Rolleiflex Salon can be had by writing to Burleigh Brooks, 127 W. 42nd St., New York City. LARGEST STOCK OF NEW AND USED PROFESSIONAL EQUIPMENT IN THE EAST Phone, write, wire or cable for quotations. Inc. We only sell equipment that we can guarantee. Eastern Representatives MITCHELL CAMERA CORPORATION HARRISON FILTERS FEARLESS PRODUCTS 723 SEVENTH AVENUE NEW YOUK CITY Telephone BRyant 9-7755 Cable Address: Cinecamera The Motion Picture Relief Fund is the Cameraman's best friend in days of stress. Don't forget it in your days of prosperity. Subscribe Now! $200 for a year's subscription to the INTERNATIONAL PHOTOGRAPHER Please mention The International Photographer when corresponding with advertisers.