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d. Because of the almost inaudible operation of the camera, low battery voltage is very difficult to detect. Battery changeout should be routinely done after whatever is considered a "safe" number of magazine exposures. A decal on the battery that would allow a penciled "check" each time a magazine is shot would greatly aid the operator in keeping track of when to do a battery changeout.

e. The zoom lens feature was an excellent addition to 16mm camera operations. However, it is difficult to locate the zoom control ring rapidly and, once located, it is difficult to position the operator's hand to exercise a smooth zoom over the complete zoom range. A lever protruding from the zoom ring would enhance zoom operations.

f. The handle grip accessory was never installed and was not considered necessary for handheld operations. However, it should continue to be carried for flight until more crewmembers can comment on its utility.

g. The crew felt that the Arriflex camera bag was a much more efficient method of storing the camera and its accessories than using a locker tray with foam inserts. Also, on flights where the camera is being frequently configured between interior and exterior use, having the camera bag immediately available on the flight deck would be highly desirable. Typically on flight 41-D, the camera was configured for interior or exterior use and remained in a fixed configuration for long periods of time, so that removing the bag from its locker was not required and was not done.

h. Four magazines of film were inadequate. At least one interior magazin for every 2 days of flight would would have been preferred for 41-D.

Movie light. [[underlined]] Two movie lights were flown for improved lighting of cabin scenes. One light blew a fuse midway through the mission. All remaining cabin photography was thereafter shot with the single remaining light. Satisfactory results were obtained in this configuration with Arriflex and IMAX cameras, although the Arriflex light meter indicated marginally acceptable lighting and the IMAX film had to be "pushed" two stops during post-flight processing. 70mm photographs taken on the middeck with only one light were underexposed. Two movie lights should be a standard complement for flight.

70mm Hasselblad. [[underlined]] Sixteen magazines of 70mm film were carried to cover mission documentation and earth observations. This quantity seemed adequate for the mission profile, and it is recommended that no fewer than this number be flown on all missions. Each magazine had an integral data back which logged MET on the film. The data back magazines were initialized prior to locker storage, required no additional crew interface to utilize, and, in post-flight review, were seen to have functioned nominally. They should be the standard magazine for all 70mm operations.

One magazine jammed, resulting in a blown camera film drive fuse. The fuse and magazine were replaced and subsequent camera operations were nominal. During this fuse changeout it was noticed that there appeared to be spaces for spare fuses in the camera battery compartment, yet the spare fuses were stowed in a locker. It is recommend [[sic]] that one spare fuse be stowed in the battery compartment to expedite fuse replacement if required.