Jenaflex AC-1 User manual

The  JENAI.'LEX  AC-l  gou  nor   ou:n  is a
 reLiable SLR  coinera  olf ering  latest techni-
 r:al.f eatures ottd. guaronteeittg ease of cspera-
 tton as rr.e,l1cs ercellertt shcrpnr:ss. Iinjoy   it.





P l e a s e     f o l l o u :     t h e      i n s t r u c t i o t t s    c o n t a i n e d .   h e r e i n .
lrtprope.r   corner(1  hancll.ing  ntary  resuLt    irt clamage
rt()t coDered    br./ our   quarantec.     I'urther   deDelop-
m e n t   o I    t h e       . l l . : N A I . ' L H X A ( : - l  T n a r l    l e a d    t o    t n i n o r
de--iations    lrort    lht:  details  giuen   here.

3

Single  lens  refler  canlera   f or frame  size
24)(36,  through-the-lens    light  metering
tuith  open  aperture,  electronic  aperture
ualue transmission

Automatic   electronic  sh'utter speed con-
trol,  stepless from  1,'1003s to 7 s

Vieufinder   information:   shutter  speeds
in the ranges   f rom  1,'16r)rrs to  r,t;gs and  r,l.ns
to  7 s, set aperture  and  flash  readiness
indication

Focusing  sEstem: Fresnel  lens  utith  dia-
gonallg   arranged    triple   raedge,  micro-
prism  ring and ground  glass ring

Manual  conxpensation of erposure  d.ata in
the range of + 2 etposure  f actors _ uieu_
finder  image shouss approrimatetg  g5 per
cent of the picture sides -  electronic flash
sgnchronisation at tlaos - pRAKTICA  bago_
net (flange f ocal length 44.4mm, inner d,ia_
meter 48.5mm) -  self-timer (about g s d.elag)
toith release button  -  connection for mov6r
uinder  -  film  inf ormaton hold,er on camera
back -  battery condition ind,ication in uieus-
finder   -  polDer soTrrce: 6 V primarg  bat_
terg  -   light  sensor: CdS photoresiitor  _
metering and control range: 1  . . . 19 EV _
dimensions of  bodg: 1J8mm  x gT mm  x
lg y^      ueight  (bodU uithout   batterg):520g

Filnt speed and contpensotion  dial
Reu'irtd button  u'ith crank
Wittdotr   f or aperture  indicotion
Cocking leuer
Frome counter                5
SelJ-timercocking le uer
Self-timer release buttott'
Lens unlocking key
Filter thread

1 0 A p e r l u r e s e t t i r t g r i r t g
 11 Uttlockirry ke11
 I 2  ltilm speedl contpensatiott ind.er
13 Hot shoe u'ith centre  conto.ct
 I4 Contoct  f or dedicated  computerised
       f lash uttit
15   Mode selector:                    outotnatic. B,  I ,;,rs,                             22    batterg           check
16 Shutter release
 t t  Cable r elease connection                                  21
t 8 Release lock
1 9 Lug f or carrging strap                                    20
20 Lens positioning mark                                    1921 Depth-of -field scale
22 Focusing ring                                                                   '1                                               B
              '11



                                13 14

23 Eyepieceu'ith occessorAholder            26 FiIm sprocket
24 Shutter                               27 FiIm take-up spool
25 Film cartridge contparttnettt            28 Camera back
                        24     23

29 Battery compartment lid, u.ith locking      32 Coupling f or motor u.inder
   scretr                                         33 Reuind release
30 Contactsf or motor u.inder                34 Thread lor tripod
31 Catchf or motor uinder                   35 Film inf ormation hold,er





  30
  31

Opemng the back
PuLt the reu:ind  button  (2) up as tar  as  it
usill go to unlock the back. Open the back
completelg;  the trame  counter  usill auto-
maticatty  return  to  the  starting  position.
lnsert the film  cartridge into the cartridge
compartrnent (25). Press the reutind button
back in aLI the tuag, turning  it  if necessarg.





Loading
Belore loading, set the mode selector (15) to
"60" as a slou shutter speed mag be tormed
in the "au,to" position. The cocking leuer can
be operated onlg ushen the shutter cgcle is
completed. Do not use torce. A  slott: shutter
speed can be cut  short bg changing  front
"ail,to" to "B".  It mag also be lormed  in the
"a1trto"position uhen the shutter is released
usithout a lens rnou,nted on the catnera.

                                       1 2

lnserting the film





Closing the bock
Press the middle  of the lock sid,eo! the back
against the camera bodg untit  the bck  isheard to engage.





1 3

Preparing to shoot
The cocking leuer (4) can be suung  out a
Littte usay uithout   starting  film  rainding-
This  "readg"  position  increases handling
retiability  uhen  taking  rapid  picture  se-
quences. Suing the cocking leuer as lar as it
 tnill go, return and press the shutter release
(16). Repeat this procedure until  the auto-
matic lrame counter (5) indicates ftame 1.
When the film  is properlg aduanced, the
reuind  button (2) is seen to rotate ushen the
cocking leuer (4) is oPerated.





                                       1 4

Setting the liln speed           W, Press the unlocking key (11) and turn  the
 dial until  the ISO ASA lilm  speed as indi-
 coted on the lilm  pack rnatches the inder
 (12). See also the ISO,/ASA and DtN  litm
 speed table  belou.    The flap from  the
 film pack can be put into the lilm  inf orma-
 tion holder (35) as an additional aid to the
 mefnora.





ISO/ASA  - DIN  lilm  speeds

lso/   16  20  32  40   64  80  125 160 250 320  500 640 1000 1250 2000 2500
    O o    o O o     a O o    o O o     o O o     o O o     o O o           . O o      o O
ASA 12      25       s0       100      200      400      800      1600     3200
D I N   1 3  1 4   "t6  1 7   1 9  20  22  23  25  26   28  29   31  32  34  35
     a o    o O  o   o O o     'a)  o o   O o   o O o    o o  o o   O o   o o
     1 2      1 5       1 8       2 1      24      27       30      33       36

1 5

Shutter release
 After checking the shutter speed range in the
 uieufinder, operate the shutter by lulty de-
 pressing the shutter release (16). When pres-
 sure is remoued from the shutter release, the
 electronics are automaticallg  stoitched off.
 With  slou  shutter speeds the remoual  ot
 pressure lrom  the shutter release does not
 affect the etposure  procedure.  In  this case
 the electronics are suitched  oll  only uhen
 the shutter cgcle has been com,pleted.
 lf  the gellou  LED  lights  up,  the camera
 should be suitably supported or a tripod be
 used.
 lf the carnera is not held at eye leoel d,uring
 automatic operation (e. g. usith tripod shots),
 push the eyepiece couer uh,ich cornes uith
 the carnera into  the  holder  immediatelg
 atter checking the shutter speed.





1 9

E t po sur e cotnp e nsotion
lf  there  are  high  contrasts  in  the  subiect,
the shutter speed can be indiuidually  uaried.
Such  correctiorts  are  necessqrll  e. S.  uith
dark  objects   irt, f ront  of a  light  background
(ouererposure     |   1; *  2) or bright  objects  irt
front  of a dark  backgrourtd  (urtderexposure
 - 1 : - 2 ) .
ln  these cdses, lilt  the  filnt speed and  cont-
pensation  dial  (1) and  set  the  inder  (12)
agairtst the desired compertsatiort ualue. The
dial. can be set to  holJ Jactors. At  the  bor-
ders of the film  speed range  -  12 ISO ASA
and 3200 /SO ASA  (12 DIN  ond 36 DIlg)   -
compensation  by tu,o  f octors  is also possible.
The contpensation  cannot e"ttend the shutter
speed ra"nge beyond  the speeds ol   I trux,s ortd
1 s .
Remetnber  to return  the dial (1) to the zero
position   lollou'ing   erposure-compertsated
shots.





                                     20

Flash photography
 U the auoilable light is insuf f icient f or hand-
 held shots (e. g. indoors), o llash unit should
 be plugged on. AII electronic ftash units can
 be used.
 Pushthe flash.unit onto the hot shoe(13) to
moke the electrical connection betuseenthe
 catneraand the flash unit usithout a coble.
 1. Use ol dedicoted corttputerised flosh units
Set the mode selector to position,,altto,'. The
camera and f lash unit are readg f or flashing
 if  a green LED  lights up  in  the  uieu;-
fi,nder(beside the  I symbol) u;hen the shut-
ter releose is gentlg pressed. Do not releose
the flash unit  il the object is so bright thot
simultaneously a red LED lights up at syrn-
bolA  . In this cose,set the mode selector(15)
to "60" and proceed as described under 2.
2. Common  electronic  llash  units  tpith  or     sure. lf , usith the mode selector in  this posi-
   without computer control                        tion, a dedicated computerised flash unit  is
Set the mode selector "gQ" :  constant lfued    used, the green LED at the  I sgmbol in thetime of  r,ry1s(take into account the guide     uietofinder   uill   light  up  cs  soon os the
nurnber and lilm  speed). tf the red LED at    carnera is readg for llashing as is the case
the  I  sgmbol lights up, the object  is so     in position "au,to".
bright thot flashing mag leod to oDererpo-
2 1

Chattgittg tlte lens
Press the unlocking key (8) and turn the lens
anti-clocl;rt'ise  os far  os  it   tt'ill  go. Rentoue
 the lens  f ront tlte carnera.
 lnsert  the  lens in  such o 1.1'oAthat  the red
 markings  (8 and 20) on the cantera and  letts
ore  opposite  eoch  other.  Press  the  lens
against  the camera body ond  turn  clocktt'ise
 utttil  the  locking  pin  is hoard  to engdge.
                           I l y u s i n g  t h e P B - M 4 2  a d a P t e r
a I I o r i g i n a l                   l e n s e s u i t h     t h e M  4 2 r 1
threacl   ('atl be connected;  lenses  of  other
makes  uith   the M 42 r  1 thread   ntust  be
suitable  f or PRAKTICA  cameras and equip'
ped  lor  nretering  at u:orking  aperture.  The
JLMFI.LX   AC    I   also u'orks  automaticolly
 uith  screu'-thread   lenses, the  onlg  differ'
ence being thot  the  light metertng  is mode
usith  t  orking aPertur e.





                                    22

Focusing

 Focusing   is  possible   using   the   triple   ued.ge
 sllstem, th.e microprism   ring  or  the ground. 91lass
  r ing .


 1 TrLpLe u:edge
 Tltis uerlcle sy.sle'?t (rllows  highltl  accurote  focus-
 il1q. ()pl.imun1  shor-prtess is  achieued  u)hen  the
 conlours  ond   lines   flota  natura|IrJ.  IncorrectlU
 aliqncd ecLges indicatc   tllot  th.e image   is  out  of
  I ocu s .

 2 M ic ro p ris m   r i r L g
 The intagt'  is correct.lA focused  uhen  the  intage
 inside the  clrid is cLear ond  flicker-f ree.

 3 Gr o u n d g la s s r i n g
The (tround glass rinq  is especiallu usef uL in macro
 artcl micro  photograph!l  and  u_:hen usin91 lenses
utth  a  s mal. I  r e l a t i u e  a p e r t u r e  (l-n u mb e r   la rg e r
than  4). The imaqe  nlust oppear  clear  ancl sharp
 Ln th e g rout t d g l a s s r i r t g .

 I nf t'ar ed photog rctphy
lnfrorecl photo(traphq  requires  a  sli<Lht correction
to the  f ocusing:  nlatch  tlLe disTance cletermined  in
f <tcusing uith   llre inf rored mark  on the lens.
23

D epth- of -fi.eld indication
The  limits  of  the depth  of  tield  for  the
selected aperture can be reod ofl from the
depth-of-field scale (21) onthelens. Erample
for a standard lens usith a local Length of
50 mm:
   distance      3 m
   aperture       8
   depth of field  from around 2 m to 5 m





Shutter release
For ease of operation seoeral functions haue
been combined in the shutter release.
When the carnera is eocked, gentle depres-
sion of the shutter release until pressure is
felt  sttsitcheson the automatic systern and
the LEDs for  the shutter speeds and flash
readiness (with  computerised  flash  units).
Further pressure uill  release the shutter.

Locking the shutter release
 Accidental erposure and unnecessarA use oJ
 pouer as a result of unintentional  pressing
 of the shutter release uthen the carnera is
 cocked or not can be auoided bg turning the
 release lock (18) clockusise to block the shut-
 ter release. To unlock turn  in the opposite
 direction. Do not  lock the shutter  release
 when it is depressed.




 Sell-timer
Cock the shutter and suing  the self-timer
cocking leuer (6) all the toag doun. Release
the self-timer bE pressing the release button
(7). The delag period  is approrimately  g s.
Do not cock the shutter u:hile the delay me-                 -7chanism  is  running.  To  auoid  incorrect
rnetering in the autotnatic.mode,  push the
egepiece cover ouer the egepiece.            6


25