Topcon RE zoom User manual

R.E Zoom Auto-Topcor F 4.7 87-2O5mm
r)  Nomencloture





O  Distonce focusing ring      @ Focol length scole       @ Aperture  scole
@  Distonce scole (meters/feet)                           ,a\\g/  Zooming  ring         @ Aperture  index
@  Distonce/zooming index     @ Aperture  ring         @ Boyonet  lens mount

 I

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               ( l  Comero olignment red dot    @ Tripod socket plote         @  Automotic    lens   diophrogm
, @        Rototing tripod  socket  fixing  @ Tripod socket screw mount            lever
          screw                          G' Attochment  fixing  pin        @  Attochment olignment pin
   @ Collopsible lens hood        QD Lens diophrogm  coupling pin

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2,  Lens Gonslruction  &  Speclficotions

Speclficotlons:
Focol lengths                  87 to 205mm
Moximum operture               F4.7
Lens construction              13 elementsin 8 groups
Angles of  fteld                  12" lt:205mm)  to 28"  (f :87mm)
Zooming  rotio                 2.4X
Zooming system            Com compensotingmechonicolrevolutiontype
Focusing system                 Rototing helicol type
Minimum operture             F22
Focol length scole               87, 1OO,120, 135, 150, 180 ond 205mm
Minimum focusing distonce        2.5 meters (2.5 to  1.4 meters with close-up ottochment lens)
Lens diophrogm                    Fully outomotic instont opening lens diophrogm oction
Exposure meter coupling system  Through-the-lens; f ull operture exposure reoding
Filter mount                     Screw-in 58mm diometer; P:0.75mm
Lens hood                          Collopsible built-in type
Overoll  length                                                    l 6 5 m m
Moximum diometer           65mm
Weight                            7 1 0 g r o m s





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Shooting distonce remoins unchonged bul depth of  field decreoses os the focol  length  is  in-
creosed.





           87mm  I  : 5.6                         205mm I  : 5.6

Subiect size remoins unchonged (shooting distonce hos chonged) but perspective decreoses os
the focol length is increosed.





           87mm   |  : 5.6                          205mm |  : 5.6





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4)  Operotlon

*  Attqchment     to  the  Comero:
  The lens is ottoched  to  the comero with greot eose ond simplicity, os with  other TOPCOR
  interchongeoble lenses. Simply line up the red dot  (10) on the reor end  of  the lens bor-
   rel  with o  similor dot on the body  flonge, with the lens mount ond body mount obsolutely
   porollel  to eoch other, ond  insert corefully.  When wellseoted, turn the lens clockwise until
   o  full stop  is mode ond  it clicks into  position.
  Do not touch the  reflex  mirror when interchonging lenses.
  The TOPCON boyonet mount permits speedy, simple ond  occurote  exchonges  of  the   in-
  terchongeoble lenses but core must be exercised to  prevent domoge to the boyonet mounts.

   Focusing  ond  Zoomlng   (Chcrnging   Focol  Lenglhs):
   Either focusing or zooming moy be undertoken  first.  However,  in generol, focusing  should
  be  token  core  of,   first  of   oll, with the focol  length set ot 205mm, ofter  which the lens
  moy be zoomed.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          i
   Focusing is much more occurote, in  this  cose, becouse on  enlorged  imoge,  with  shollow
   depth  of   field,  is used for  focusing, ond shifting in focus will be very  smoll os the lens is
  zoomed  in to  the 87mm focol  length.  For greotest occurocy, however, focus ot  the  focol
   length required.
  Focus with the distonce focusing ring  (l)  ond zoom with the zooming ring (5).                                                    I
 *  Attochment     to  the  Trlpod:

Screw the tripod screw into  the  fripod  socket  screw  mount (14),  of  the  tripod  socket
    plote  (13), ond  fix  the lens firmly  to  fhe  tripod.
   The lens moy be rototed  so thot the comero con be  used  for  toking  elther  verticol  or
    horizontol  formot   pictures.  There  ore  clickstops ot three  positions 90 degrees oport,  for
   obtoining verticol or  horizontol formots, ond the comero moy be fixed  firmly  ot ony  posi-
   tions with the fixing screw  (ll).
   A strong ond sturdy tripod  should be used to prevent comero vibrotion ond o tripod mount
   without rubber pod should be used, so thot qttqchment  will be mode  directly  ogoinst  the
   metol surfqce or  o  plostic pod surfqce.

 x   Exposure:
   Photogrophy with the zoom lens requires o  little over-exposure  odiustment of  the  reoding
   token with the conventionol exposure meter, but, of  course, there ore no worries when tqk-
   ing exposure meosurements with the ToPcoN  RE Super ond RE-2 becouse of  the  thru-the-
   lens mirror-metering  feoture  of these comeros.  (Reod the instruction monuol for the comero.)
  When toking pictures of  the open londscope, however,  point the lens down  ot  the  ground
   ot obout o 30o inclinotion to  get  less sky  in the reoding.  When  the subiect is bock-lighted
  ond dork, or  the surrounding is dork  with the subiect very  light, move  in close to  the moin
   subiect  for  the  reoding  or  zoom  the lens to 205mm for  o reoding  of  the dork  or  light
   subiect oreo  only, which would olso opply when toking wide-ongle photogrophs.
x Depth   of  Fletd:
  When o subiect is focused ot o certoin  distonce,  the  lens  presents on  opporently  shorp

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imoge  not  only  ot  ihe  precise focused distqnce but olso of somewhot forther  qnd neqrer
distonces, ond this zone  of  opporent shorpness is known os the depth  of  fteld.
The depth  of  field  is greotest os the lens diophrogm  is closed down  ond  leosf  os   it   is
opened  up.    lt  is greoter  os the subiect-to-comero distonce is increosed ond leost ot close
focusing disionces.  The depth  of  field olso increoses ot the shorter  focol  lengths ond  de'
creoses ot the longer focol lengths.  Finolly, the depth of  field is greoter in the bockground
ond shollower in the foreground  but grows  progressively  equol  os  fhe  focol  distonce  is
decreosed.
The  depth  of   field  preview  lever  of  the TOPCON RE Super permits octuol previewing  of
the depth  of  field  for  o selected operture,  especiolly when  used  in  combinotion  with  o
groundgloss focusing screen.
When   it  is required  to  qscertoin the depth  of  field  for  certoin focol  lengths, refer  to  the
depth  of  field toble  for  the focol  length being used, on the following  poges.


                                                                                             I

Lenr  Hood,   Fllrerr   ond  Glore-Up   Attachment    Lonrs
The lcnr hood  is  built-in ond  simply  cxtcndcd   for  use ond  collopscd  for  storoge.
Thc TOPCON 58mm rcrew  mounl  lens  flter  should be used on  front  of  the  lens,   in  both
block-ond-white ond color photogrophy.
The screw-in  close-up ollochmcnl  lens  is supplicd  together  wirh  the  lens ond  permits  close-
ups from  2.5  lo  1.1 meters.





Infrored   Photogrophy:
Since the infrored  roys ore  not  visible colors but ore longer  in wovelength thon the visible
white  light roys, odiustments must be mode in  f ocus  f or  the longer wovelength by  extend-
ing the lens to compensote for  the difference.
The lens extension required for  compensotion differs with the focol length ond is, for  exom-
ple, O.4mm with the 205mm focof  length, 2.2mm with the 87mm focol  length, etc.
Best results ore obtoined  in infrored photogrophy over 20Omm ond, thus, in  the  cose  the

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lens is used of 2O5mm focol  length, the distonce setting obtqined by focusing in the normol
  monner should be shifted o distonce equot to  the spocing between the  infinity ond 60 meters
  scole morkings.
  Reod the instructions given  in the TOPCON RE Super ond RE-2 monuols, os well os the  in-
  structions enclosed  with  the   filni,  buf,  in ony cose, try  to use o shutter speed which will
  permit stopping down  the lens diophrogm.





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