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344 American Cinematographer • August, 1936 Fig. 1 Making the Clouds Roll By by F'g- 2 James A. Sherlock M ost personal filmers have at some time or another a few feet of unexposed film left in their camera that is just itching to be exposed. Here is an interesting way to use this footage and one that will leave an appeal for at least another hundred feet of this subject that can be filmed any place where there is a blue sky and cumulus clouds. The thrill of first seeing the speed of cumulus clouds increased cinematically more than repaid this amateur for his trouble. The subject can be filmed by every serious amateur and this partic- ular brand of clouds mentioned can be found at all times of the year, after stormy weather. If your camera is made with a single frame exposure device, ^ half your troubles are over; mine was not, so I set the speed control at eight frames a second (ordinary speed will do if the camera has only one speed) . I next removed the lens, gave the starting button one sharp touch and noticed that the shutter opened only once, after I could control the weight of my touch. This meant that only one frame would be exposed each time I gave one sharp touch. Next I mounted the camera on my tri- pod, a good strong rigid one v/ith its feet firmly planted in the ground to prevent movement; this is very necessary with single frame exposures. Heavy filters that will absorb some of the blue light were tested and the 23A (red) or G (orange) were found most suit- able. I used the latter. These have a factor of three with or- dinary panchromatic film and this exactly compensates for the extra light that reaches the film when single frame pictures are taken as the shutter does not travel as fast when only opened one at a time. The camera is ready now, the filter chosen, next Fig. 4 the exposure meter must be brought into use. If a big bank of clouds is coming, measure the light from the bottom of these, exclude as much blue sky as possible. If the cloud is a samll one with a lot of blue sky surrounding it, close the aperture one stop on your meter reading. If you use either of the filters, recommend now you set your aperture without allowing any com- pensation for your filter. Turn your view tinder to a spot in the blue sky that your cloud is approaching, preferably a cloud that is high in the heavens, as the orange filter will make a blue sky darker if the filter has no haze to penetrate. Figures 1, 2 and 3 were taken on panchromatic film with a G filter within five Continued on page 357 All above were shot on Panchromatic film with a C Filter. Notice how dark the sky is in Fig. 3 as compared to two previous shots. Notice on lower picture how reflected water lightens whole picture.