FujiFilm EBC FUJINON 1.4/50mm User manual

REPAIR MANUAL AND PARTS LIST
INTERCHANGEABLE LENSE FOR ST8O1, ST9O1
EBC FUJINON 1.4/50mm
FUJI PHOTO FILM CO., LTD.
2G-30, Nishiazabu 2-Chome, Minato-ku, Tokyol06, Japan

iNDEX
EBC FUJINON 1.4/50mrn LEI\lS S]801 "ST901
INtrIEX
I oISaSSEMBLY
1. HELICOID
2. APERTURE
3. MOUNT RING
REPAIR AND ADJUSTMENT
1. ADJUSTMENT OF FOCUSING .,.,..,...
2, HELICOID
3. APERTURE
3. 1 Adjustment
3.2 Aperture blades jammed with oil .,.............
3.3 Aperture seat ............
3.4 Lever in mount ring assembly
4. APERTURE SELECTOR RING ..........
4.1 Deformed aperture selector ring .............
3
5
1
,I
1
1
11
11
13
15
15
15
17
20
5.
4.2 Unsmooth cam ring operation
APERTURE TRANSMISSION PIN
I PART LIST
INDEX - 1

DISASSEMBLY
EBC FUJINON 1.4/50mm LENS ST801 'ST901
IDISASSEMBLY
1. Helicoid
d. With the focusing ring set to the minimum distance, loosen three screws
(4) and remove the filter ring (3) and name ring (2).
Remove the front lens assembly (5) and rear lens assembly (89).
Remove the stop ring (14), åfld remove the aperture assembly (15).
Remove three screws (88), and remove the helicoid assembly (29).
Remove the rubber ring (96), äod remove the focusing ring assembly (30)
a"fter removing three screws (34).
f. Remove helicoid guides (36) and (38) after removing two screws (37) and
two screws (39) respectively.
g. Disassemble the helicoid assembly to male helicoid (35), helicoid ring
(40), knurled ring (41) and female helicoid (42).
Aperture
a.t Remove the aperture assembly (15) as described in I-l-a, b and c above.
b. Remove three screws (25), and disassemble the aperture assembly into
each component part.
Mount ring
E. Remove three screws (88), and remove the mount ring assembly (48) and
cam ring assembly (44).
b. Remove the screw (49), and remove the rotary lever assembly II (50) and
rotary lever assembly I (55).
c. Remove thepin (61) and screw (65), and remove the seatplate assembly
(62).
Remove two screws (65), and remove the crank assembly (66).
Remove two screws (72), ärd remove the bellcrank assembly (73).
Remove two cölumns (79).
Remove the screw (86) and hold ring (87), and remove the aperture
selector ring (85).
b.
9.
d.
€.
2.
3.
d.
€.
f.
o
b.
-1-

1.4/50mm LENS ST901
EBC FUJINON 1.4/50mm LENS ST801 'ST901
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-2-

REPAIR AND ADJUS-I-'MENT
EBC FUJINON 1.4/50mm LENS ST801 .ST901
IREPAIR AND ADJUSTMEINT
l-. Adjustment of focusing
ä. Disassemble as described in I-l-a above, and remove the rubber ring
(e6).
b. MounrL the lens on a camera body having correct flangebaek. Install a
ca.ble release on the camer and set shutter speed to 'rBtr. Install the
camera on the reflector (KL35A A0GA1) of a lens tester (Gokosha Model
24LT-2D). (See Fig. 2.')
c. Loosen three screws (34) and watching focus in the lens tester, properly
turn the helicoid ring (40) to adjust flangeback. (See Fig. 3,)
B,etighten the three screws (34), and lock them with screw locking agent.
Install the filter ring (3) and name ring (2), ånd secure them with three
screws (4). Check the name ring and insure that characters I'FUJ'?are
in the positions shown in Fig. 4.
Reinstall, the rubber ring (96) with Pliobond.
d.
e,
-3-

REPAIR
EBC FUJINON 1.4/50mm AND AD.]USTMENT
LENS ST8O1 "STgON
Fis.2
Fis. 3
Fig. 4
Characters "FUJ" should be within angle O.
-4-

REPAIR AND ADJUSTMENT
EBC FUJINON 1.4/50mm LENS ST801 .ST901
f.
g.
h.
Helicoid
The helicoid should turn lightly, equally and smoothly. If not;
ä. Disassemble the helicoid assembly as described in I-1, and thoroughly
clean the male helicoid (35), helicoid ring (40), knurled ring (41) and
female helicoid (40) with Trichlene.
b. After drying, apply helicoid grease (Losoid grease 6304-4) to the male
helicoid (35), helicoid ring (40) and lcrurled ring (41), assemble them,
turn them many times, and completely wipe out grease come out from
them.
c. Install the malehelicoid (35), helicoid ring (40), knurled ring (41), and
femalehelicoid (42) so that they arepositioned as shown in Fig. 5, and
install the helicoid guieds (36) and (38) with two screws (3?) and two
screws (39) respectively, Be sure to lock the screws with screw locking
agent.
d. With thepartspositioned as shown in Fig. 5, install the focusing ring
assembly (30), 'and secure it with three screws (34). (See Fig. 6.)
€. Install the mount ring assembly (aB), ilrd after applying screw locking
agent to three screws (88), tighten them.
Install the aperture assembly (15), ård secure itwith the stop ring (14).
Adjust aperture as described in II-3-3,1below.
Adjust flangeback as described in II-l-b through e.
-5-

REPAIR AND
EBC FUJINON 1.4/50mm LENS ADJUSTMENT
sT801 .ST901
Fis. 5
Fis. 6

RE''AlR At\\lD AD"IUS ;MENT
EBC ;U.lrli\r0i\l i.rl./50rri,ri tEl\s s]-Erl1 " sT901
3. Aperture
3.1 A,djustrnnenll
&, InstaLl the aperture assembly (15) on the helicoid assembly (29) with
the stop ring (14). (See Fig. 1.)
Set the pin (80) to 5.9 mm from the flange surface by the use of a
gauge (L52-GA2) after setting the aperture selector ring to F1-6.
(See Fig. 7.)
Loosen three screws (16), and adjust aperture by turning the ring
(1?) so that it comes into contact with the circumilerence of a
2.10 mm diameter circle as shown in Fig. 8.
Check aperture at each F number and see if it is within the
permissible diameter range by the use of a scaled magnigier.
(See Fig. 9.)
b.
c.
-7 -

REPAIR
EBC FUJINON 1.4/50mm AND ADJUSTMENT
LENS ST8O1 . ST9O1
Fig. 7
Fis. 8
Fis. 9
L52.GA2
FNO Permissible diameter range
215.s8ö 19.500
2.8 10.790 1s.650
47.se, e.5ed
5.6 5s4A 6.750
8s.760 4.750
11 2.66ö 3.350
16 1.88d 2.36Q
-8-

REPAIR AND ADJUSTMENT
EBC FUJINON 1.4/50mm LENS ST801 .ST901
d. Checking time lag
Mount the lens on a camera body, set shutter speed to 1/1000 at the
camera body, set the aperture selector ring and focusing ring
respectively to F16 and minimum distance at the lens, watch the
portion I'4il and aperture on a straightline as seen in Fig. 10,
release the shutter, and see if the first blind begins to run after the
aperture is stopped down to the minimum.
Insure that the aperture observed from the t'B' side is the same as
ItAfr side.
Install the frontlens assembly (5) and rear lens assembly (S9), ilrd
adjust flangeback as described in II-1 above.
Install the filter ring (3) and name ring (2), änd secure them with
three screws (4).
Height of pin
Check the pin (80) for height from the flange surface.
i) Free length should be 8.2 mm or less.
ii) When height is 8.0 mm, the aperture should be fully opened.
iii) When height is 5.9 mm, the aperture should be stopped down to
the minimum,
iv) It should be possible to push the pin down to less than 5.8 mm.
Resistance of pin
Check the pin (80) for resistance by the use of a spring blancer.
i) It should be 300 grams or less when turning the aperture
selector ring to F1.4.
ii) It should be 100 grams or less when turning the aperture
selector ring to FL6.
€.
f.
$.
h.
-9-

REPAIR AND ADJUSTMENT
EBC FUJINON 1.4/50mm LENS ST801 .ST901
Aperture

REPAIR AND ADJUSTMENT
EBC FUJINON 1.4/50mm LENS ST801 .ST901
3,2 Aperture blades jammed with oil
&. Remove the aperture assembly (15).
b. Remove three screws (25), and thoroughly clean all the disassembled
parts of the aperture assembly (15) with perchloroethylene.
In addition, wipe inner wall of the male helicoid (35) to which the
aperture assembly (l-5) is fittecl with a piece of cloth or paper
irnp regnated with p erchloroethylene,
.: c.,'Install the aperture assembly (15) after reassembling it, and adjust
aperture and fl angeback.
3.3 Aperture seat
When the aperture seat (22) does not operate smoothly, remove the
aperhrre assembly (15), and check it.
a.. When the base ring assembly (26) is not fitted smoothly to the
aperture seat (221, causing the aperture seat to operate unsmoothly,
thoroughly clean the sliding surfaces of the base ring and aperture
seat with a piece of paper impregnated with ether or aleohol, rub
core (graphite) of a pencil against the surfaces, slide them each
' other many times, sqlarate them, and blow out particles of the
pencil core with a blower.
CAUTION: Do not wipe sliding sr.lrface of the aperture seat with
ether or alcohol hard. The surface treatment may be
removed,
Be su.re to wipe it lightly and carefully.
When pins (20) on the aperture blades (19) are not fitted into grooves
on the aperture seat (22), causing the aperture seat to operate
unsmoothly, break-in the grooves on the aperture seat (22) with a
1.5 mm diameter drill rod carefully so as not to wear them
excessively, to improve the fitting.
When pins (20) on the aperture blades (19) are not fitted into holes on.
the ring (17), causing the aperture seat to operate unsmoothly,
break-in theholes on the ring (17) with a 1.5 mm diameter drill rod
carefully so as not to wear them excessively, to improve the fitting.
Assemble the aperture assembly (1-5), and adjust aperture and
flangeback.,
b.
C.
d.
- 11-

REPAIR AND ADJUSTMENT
EBC FUJINON 1.4/50mm LENS ST801 'ST901
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-12-

REPAIR AND ADJUSTMENT
EBC FUJINON 1.4/50mm LENS ST801 .ST901
3.4 Levers in mount ring assembly
When levers in the mount ring assembly (a8) do not operate smoothly,
check and repair as follows:
ä. Remove three screws (88) and remove the mount ring assembly (48).
Push the pin (80) and see if the crank assembly (66) and rotary lever
assemblies (50) and (55) operate smoothly.
Check the pin (24) to see if it is fitted to the rotary lever (52)
smoothly.
If not, break-in the long groove on the rotary lever (52) with a
1.5 mm diameter drill rod carefully so as not to wearthe long groove
excessively, to improve the fitting.
Apply screw locking agent slightly to the threaded portions of the
screws (88), and securely tighten them.
Adjust aperture and flangeback"
b.
C.
o
-13-

REPAIR
EBC FUJINON 1.4/50mm AND ADJUSTMENT
LENS ST8O1 " ST9O1
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-14-

REPAIR AND ADJUSTMENT
EBC FUJINON 1.4/50mm LENS STB01 .ST901
4. Aperture selector ring
4.I Deformed aperture selector ring
When the aperture selector ring (85) does not turn smoothly due to
deformation (caused by dropping the lens, etc.), replace it as described
below:
ä. Disassemble the mount ring assembly as described in I-3 above, and
Temove the aperture selector ring (85).
b. Apply Losoid grease (5019) slightly to the sliding portion of a new
aperture selector ring.
c. Apply Losoid grease to the V-groove (for clicking) slightly more
than the sliding poriton of the aperture selector ring,
Install the new aperture selector ring, and secure it with the hold
ring (87).
Apply screw locking agent (Hermeseal) to three positions of the
threaded portion of the hold ring carefully so that Hermeseal does
not stick on the flange surface.
Apply screw locking agent to three screws (88), and secure the
aperture selector ring on the main body assembly (12) with the three
screws.
g. Check flangeback, and adjust if necessary.
4.2 Unsmooth cam ring operation
When the cam ring assembly gl does not operate smoothly, causing
the aperture selector ring to operate unsmoothly, repair as described
below:
a. Disassemble the mount ring assembly as described in I-3 to rernove
the cam ring assembly (44), and check it.
b. Apply Losoid grease (6304-4) to the sliding surface of the cam ring
assembly (44) slightly.
c. Install the cam ring assembly @a) on the main body assembly (12)
with three screws (88), and check flangeback.
NOTE: When the cam ring assembty g{ is replaced with a new
assembly, adjust both flangeback and aperture.
d.
€.
f.
-15*

REPAIR AND
EBC FUJINON 1.4/50mm LENS ADJUSTMENT
sT801 .ST901
Fig.13
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-16-

REPAIR AND ADJUSTMENT
EBC FUJINON 1.4/50mm LENS ST801 'ST901
5. Aperture transmission pin
This pin (on the aperture selector ring (85)) is very important because this pin
transmits an aperture selected by the aperture selector ring on the lens to the
aperture resistor built in the camera body through the aperture transmission
ring on the camera body. Incorrect height of this pin or damaged pin may
cause an erroneous exposure. Check the pin for height and damaging as
described below.
ä., Height: Should be within range of 0.4 to 0.6 mm from the flange
surface.
b. Damaging: The surface of the pin which comes into contact with the
pin of the camera body should not be damaged.
When height is incorrect or the pin is damaged, replace the aperture selector
ring (85) with a new one.
-17-

REPAIR AND
EBC FUJINON 1.4/50mm LENS ADJUSTMENT
sT801 .ST901
Fis.I4
Fis.15
Aperture transmission pin
-18-