Maintenance - National 425 Series Instructions Manual

4. ADAPTING CCTV VIDEO CAMERA OR SLR CAMERA to microscope (Trinocular Model Only)
(a.)
B. To mount SLR camera, the accessory #930-425 SLR adaptor (not included) is required, along with a T-mount available from
any camera store. This accessory has a 2.0x photo lens incorporated within the adaptor.
Remove front lens of SLR camera. Attach appropriate T-mount in place of front camera lens. Screw threaded end of T-
mount onto threaded end of SLR adaptor.
Locate knurled screw (c.) located at the front of trinocular port on head. Loosen knurled locking screw counter-clockwise to
permit removal of black plastic disk covering trinocular port.
Insert SLR adaptor tube, with camera already mounted to adaptor, into trinocular port. If adaptor does not insert easily,
further loosen knurled screw at front of port until adaptor tube drops into port and is firmly seated. Retighten knurled screw to
secure adaptor and camera in place. Pull sliding rod (b.) until fully extended, to direct microscope image to trinocular port.
Proceed with operation of camera according to manufacturer's directions.
C. To mount CCTV or digital camera, the accessory #930-426 video adaptor (not included) is required. This adaptor has a 0.45x
lens that includes an adjustable diopter which assures image parfocality when viewed through a video monitor.
Observe that video adapter has two black knurled rings. If your CCTV camera has a 1/2 inch chip, leave both knurled rings in
place, thereby creating a "CS" type mount. If your CCTV camera has a 1/3 inch chip, remove only the top black knurled ring
from CS-mount by turning counter-clockwise. The remaining video adaptor is a "C" type adaptor.
Remove front lens from CCTV camera. Thread front of camera onto threads of video adaptor.
Locate knurled screw (c.) located at the front of trinocular port on head. Turn knurled locking screw in a counter clockwise
direction to loosen screw and to permit removal of black plastic disk covering trinocular port.
Insert video adaptor tube into trinocular port. If adapter does not insert easily, further loosen knurled screws at side of port
until adaptor tube drops into port and is firmly seated. Retighten knurled screw to secure adaptor and camera in place. Pull
sliding rod (b.) until fully extended, to direct microscope image to trinocular port.
Proceed with operation of video camera and TV monitor according to manufacturer's directions. If microscope image, as
viewed through TV monitor does not remain in focus when microscope magnification is changed, recheck CCTV camera chip
size. Perhaps it will be necessary to either replace or remove the top black knurled ring in order for the video adaptor to be
compatible with the chip size of your CCTV camera.

MAINTENANCE

WARNING: For your own safety, turn switch off and remove plug from power source before maintaining your microscope. If
the power cord is worn, cut or damaged in any way, have it replaced immediately to avoid shock or fire hazard.
1. OPTICAL MAINTENANCE
A. Do not attempt to disassemble any lens components. Consult a microscope service technician when any repairs not covered
by instructions are needed.
B. Prior to cleaning any lens surface, brush dust or lint off lens surface using a camel hair brush. You can also use an ear
syringe or canned compressed air, such as that sold by most computer stores.
A. Trinocular model #425T is equipped with a port (a.) on top of binocular
head. By using optional accessory adaptors, either CCTV video or 35mm
SLR cameras can be mounted onto the microscope.
T-mount
These models are also equipped with a sliding rod (b.) located on the
SLR
backside of the head. When this rod is pushed completely into the head,
adaptor
the microscope image is directed 100% into both eyepieces of the
microscope. When his rod is pulled as far as possible away from the
(c.)
head, the microscope image is directed into the trinocular post. You will
still be able to observe image through right eyepiece, but no image will
(b.)
be visible through left eyepiece.
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