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1. The interchangeable sound-proofed lenses ofthe ARRIFLEX 16 BL
The lenses for the ARRIFLEX 16 BL are contained in a separate insulated housing and can be
exchanged quickly. The lens and outer housing form a single unit, even though each connects
separately with the camera. The lens is locked inside the camera whereas the housing is locked on
the front of the camera.
In Figs. I and II the operating controls of the lens are shown:
•focusing adjustment I/4
•focal length (zoom) adjustment I/ 10 a. I/II
•diaphragm adjustment II/10
The plexiglass window on the housing (I/3) enables reading of the original lensscales. For focusing,
focal length, and diaphragm, additional scales are located on the adjustment rings of the housing and
can be read off at the index marks on the side by the camera assistant. The adjustment rings have
handy grips for easy operation. For comfortable adjustment of the zoom range a detachable lever
(I/10) has been added. This lever is screwed into a separate ring which fits loosely over the focal
length adjustment ring and can be brought into any desired position. When the zoom lever has been
screwed in, the counter sleeve is left loose and the outer ring and zoom adjustment ring are brought
into the desired position. The counter sleeve of the zoom lever is then screwed tight, whereby one
makes certain that the rings are firmly locked together. The lens outer housing is equipped with a
hinge (II/8) so that the frontpart becomes a door (V/3) for the filter holder (V/9). A knurled tension
lock, which catches automatically and can be tightened, presses the filter holder against an elastic
sound – insulation support. To change the filter or plane glass (V/10), the lock is turned counter-
clockwise and the hinged front (V/3) is opened so that the interchangeable filter holder (V/9) can be
taken out. The filter holder contains the filter or plane glass mounted upon an elastic support and
retained by four leaf springs. To change filters, the upper and lower parts of the filter holder (V/9) are
turned against eachother until the two square cut-outs match, the filter is taken out, a new arm put in,
and the process is reversed. Important!: If square filters of up to5 mm thickness are used, the knurled
upper part is to be turned against the lower part in a clockwise direction. If filters thicker than 5mm
are used, the upper part is turned in a counter-clockwise direction to avoid damaging the leaf springs.
When no filter is mounted, the plane glass of the same size must be used. The filter and the plane
glass however, can never be used together. The adjustable matte box with bellows (II/7) is mounted
upon the hinged front (V/3) by seating it at the lugs (V/1) and locking it with the snap catch (V/2.)
The matte box swings with the hinged front (V/3) when it is opened.
A zoom lens consists of a stationary main lens and an adjustable system of auxiliary lenses. The
latter system is usually of considerable length so that the front lens, because of this, enters into the
focusing range of the main lens. This is especially the case with short focal length settings and small
apertures. For this reason, the front lenses must always be kept especially clean, as foreign particles
could easily show up in the picture. The same applies to the plane glass and filter.