The Questar MFL
90 is a surveillance lens for situations requiring a rugged, very
compact and lightweight long focal length optic. Questar MFL lenses
offer a compactness and variation in focal lengths unavailable with
continuous zoom lenses. The MFL 90 offers five effective focal lengths
from 480 mm to 3100 mm in a 35 cm, 5.4 kilogram package. Included
are selectable neutral density or spectral filters for optimized
performance
under varying conditions. Manual control is performed from the large
knobs at the rear of
the system. Oversized LED integrated into rear plate to indicate
current filters or EFL selection. The manual focus is smooth and
precise utilizing the precision ball screw nut. The oversized lens/filter
contol knobs have a single turn detent stop for precise alignment
of selected lens or filter. The lens is weatherized with protective
clear optical flats front and back. The optical performance of the
MFL 90 is superb, capable of resolving on television a 7mm feature
at 1 kilometer.
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