The international photographer (Jan-Dec 1934)

March, 1934 The INTERNATIONAL PHOTOGRAPHER Twenty-three MINIATURE CAMERA PHOTOGRAPHY with cardboard. The negative being in the enlarger (Continued from Page 20) an exposure of five seconds is made. Another small por Metol-Hydroquinon Developer X™ f th(: PaP" is drawn out from beneath the card For Content Paper feard, and another exposure of five seconds is given. Water Jin m-e ls oonrinued for about tour or five exposures. I his Metol or Elon 15 grains strip is dcveloPed for tw0 minutes and from the variously q„a „, c l i •.. / i \ i exposed portions on the paper, the correct printing time bodium sulphite (dry) 1 ounce ' . y . . . l . l . ' „ . • , , u..j,„„u:„„„ An , • °i the negative is determined, near in mind that the riydrochinon ---- 6(j grains . b ,, , . , c„j: r1 u t a \ t/ last exposure was nve seconds, the one before that ten sodium Larbonate (dry) y2 ounce , v . , . ' . . . . v «.„ : ~ » -a i • seconds since that portion of the paper strip received Potassium bromide 4 grains r , * ' * ' »' j) i n . two nve second exposures, etc. t or Bromide Papers ™ *: ' . Witer 3? photographer has at his disposal a unique mstru H/T„* i iri on ment to determine the printing: exposure time. This is Metol or Lion 20 grams , T , , . ' , • , , T_r i i nn ■ the Largodrem. It is connected into the same electric Hydrochinon ---- 90 grains ■• i i i i -r-i i j c„j „ o l u-4. t a \ i/ current which supplies the enlarger. 1 he meter is placed sodium sulphite (dry) .11 ounce , i i i • • i . ,,7. , c„j „, n u i a \ it/ upon the easel and the negative projected upon it. With sodium Larbonate (dry) l1! ounces ? r , , . f , ' , J . . ' . the use ot tables, a simple calculation gives the correct When mixed add two drams of 10% solution of printing time. potassium bromide. Another important consideration in enlarging is accu Many workers prefer the use of Amidol, claiming rate focusing. This should always be accomplished with that it produces a good color and has the ability of the lens diaphragm wide open. The latter can be closed bringing out all details in the negative. From personal down somewhat once focusing has been accomplished. A experience I have found Amidol to be very satisfactory. magnifying glass will be found handy in this work. E. This developer must be freshly prepared for it does not Leitz supply focusing magnifiers which are mounted on keep well upon standing. The formulas for Amidol are a socket joint on a horizontal rod which slides on a as follows: bracket on a vertical support. The latter slips into a sj/nidol Developer hole in the baseboard. This magnifier can be moved For Contact Papers over tne e"tire area of the enlarging paper, and then Water to make 10 ounces swunS aside after use Sodium Sulphite (dry) 250 grains A uniuue instrument is offered by Photo Utilities, Amidol ------ 50 grains ^nc"' wmcn ,s known as the P. U. Focusing Microscope. Potassium Bromide 2 grains This consists of a metal base holding immovable the For Bromide Papers microscope tube at an angle of 45 degrees. The lower Water to make ---- 20 ounces end °^ t^le tu^e 1S cut away allowing a selected por Sodium Sulphite (dry) 325 grains tion of the Pr0Jected image to strike a circular mirror Amidol 50 grains 'le'd at an a^e Para^e^ with the plane surface of the Potassium 10 grains easel. A ground glass within the tube carries cross lines for permanent adjustment of focus to the individual eye. All manufacturers usually enclose with the package Once the setting is adjusted it is made permanent with of paper a list of formulas which according to their a set screw. The projected image reflected to the ground experimentation they have found to be ideal for the glass is brought to fine focus with the focusing device paper in question. If all of the papers used are of the on the enlarger and when the proper setting is reached same type it is advisable to employ the developer recom the grain of the emulsion is visible on the ground glass, mended. When papers of varied makes are employed, Many photographers are in the habit of closing down the formulas above will be found to yield satisfactory the enlarger lens diaphragm considerably after accurate results. focus has been established. This is not necessary. Actual In general the exposure of the paper should be such ly there is one plane of sharp focus, and since the nega that the development time will be two minutes. An ideal tive consists of a single plane, once focus has been estab procedure is to first expose a test strip, and from that lished, closing down the diaphragm considerably to ob determine the correct printing time required by the nega tain a large depth of field will only necessitate a longer tive in question. A small strip of the paper used rs exposure time. Enlarging should not be compared with placed on the easel, and all but a small portion covered (Turn to Page 31) "ArtReeVes" Presents NEW TYPE Recording Lamp The EQUA-LITE More Light — Less Current Equalized Glow Bar Motion PioTure/EojjipmenT(o. |Td 64-5 NORTH MARTEL AVE CABLE ADDRESS ARTREEVES HOLLYWOOD, CALIFORNIA, USA Cables: ArtReeves Francais Espanol Deutsch Svenska PHONE: WYOMING 4501 Please mention The International Photographer when corresponding with advertisers.