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securing the brass focus rack onto the back of the

sliding focus block (see

Figure 11 – Remove bottom screw holding the focus rack

Carefully remove the (now loose) brass focus rack using

tweezers or needle-nose pliers (see

Figure 12 – Remove the brass focus rack

Check the Focus Block for Freedom of Motion

Smooth, free action of the sliding focus block is critical

to the performance of the focusing mechanism, since

the mechanical design of the coaxial focus mechanism

relies on gravity to eliminate the effects of the

mechanical backlash inherent in the rack-and-pinion

gearing mechanism. If the movement of the sliding

focus block is too stiff, this will cause a visible hysteresis

effect in the fine-focus knobs (i.e., there will be a

noticeable lag before the focus changes whenever the

direction of the fine-focus knobs are reversed, leaving

the operator feeling as if they are continually chasing

the focus).

With the focus gearbox and the brass focus rack

removed from the scope, the sliding focus block should

now move freely. Raise and lower the focus block by

Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism

Figure

11).

Figure

12).

hand and note the feel of this movement. The focus

block should slide freely without any noticeable

stiffness, sluggishness, or binding. Raise it to the top

and release it.

It should drop quickly without any

significant lag. If the action of the sliding focus block is

found to be unacceptable, it will need to be

disassembled, cleaned of old grease, and reassembled

with fresh grease. The best time to do this is after the

coaxial focus

mechanism

disassembled, since it is a bit easier to service the

sliding focus block while the other focus parts are not

present in the pillar arm. Although the procedure for

servicing the BH-2 sliding focus block is beyond the

scope of this document, it is fully covered in the

Complete Teardown, Cleaning, and Reassembly of the

Olympus BH-2 Sliding Focus Block

series. You will be prompted at the appropriate point in

this document when you should perform the service on

the sliding focus block (if service is needed).

Remove the Fine-Focus Knob Caps

Before the screws securing the fine-focus knobs to the

fine-focus shaft can be accessed, the end caps on both

knobs must first be removed. These caps are held in

place with adhesive on their back surface. To remove

the knob caps, insert the tip of a tweezers or the tip of a

very small screwdriver into the notches in the caps and

gently pry the caps free from the knobs (see

Be careful when doing this, so as to not bend or damage

the knobs caps while prying them free. If the adhesive

does not release with moderate prying force on the

knob caps, use gentle heat from a heat gun to soften

the adhesive holding them in place, or squirt isopropyl

alcohol into the notches using a syringe or a small

dropper and allow the alcohol to soften the adhesive

for a bit before attempting to remove the knob caps.

Once you have removed the knob caps from the knobs,

be sure to place them someplace where dust and debris

will not foul the exposed adhesive on their back

surfaces.

Figure 13 – Remove the caps from the fine-focus knobs

has

been

completely

document in this

Figure

13).

Revision 4

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