Orphan ASAHI PENTAX Manuale utente
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SPECIFICATIONS
Auto Extension
Tubes
(lnner Bayonet) i
Camera: Asahi Pentax 6x 7
Lenses: 6x 7 interchangeable lenses from 55mm to 300mm
Length: f 1-14mm (0.55
in.) fi2-28mm (1.10
in.) #3-56mm (2.2tin.) {
Weight: #l-75e Q.65
oz.) fi2-90g (S.LT
oz) #tzls (4.4Ioz.)
The 6X7 Auto Extension Tube is designed for use with Takumar/ixZ inter-
changeable lenses from 55mm to 300mm. The Auto Extension Tubes can be used
individually or in any combination, utilizing the fully automatic diaphragm of the
lenses. For close-updata on each lens, refer to Tables 1-6 (pages
4- 9).
Extension
Tubes
(Outer Bayonet)
Camera: Asahi Pentax 6X7
Lenses: 6x 7 interchangeable lenses from 400mm to 1000mm
Length: A-23mm (0.91
in.) B-46mm (1.81
in.)
Weight: A-1109 (3.88
oz.) B-150g (5.29
oz.)
Extension Tubes A and B are for Takumar/6x7 lenses from 400mm to L000mm.
For close-updata on each lens, refer to Tables T-9 (Pages
11-13).
. - , ,,tlg*r-.o;r,; .1
Assem
bly
Align the red dot on the Auto Extension
Tube with that on the body mount and
turn the tube clockwise until it automa-
tically locks. Make sure that the tube is
completely locked.
Disassembly
When detaching the lens from the tube,
press the bayonet locking pin on the
tube and turn the lens counter-clockwise
until the red dot on the lens matches
that on the tube.
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HOWTOUSE
THE
GLOSE.UP
TABLES
ry & #r.ffro
Depending on your particular close-up situation, determine first 1) the picture area, 2) the
film-to-subject distance, or 3) the magnification. Then select the most suitable Extension
Tube combination according to the data in the tables.
Determine the magnification first t
When you want to magnify or reduce a subject to a specific image size, determine the
magnification first. For example, if the image size is half the size of the subject, the
magnification is 0.5. If the image is twice as large as the actual subject, the magnifica- ,
tion is 2. The close-up table will show which Extension Tube combination to use. ',;
.:
Determine
the picture area first
When the subject area to photograph is determined, measure its length and width. Then
refer to the picture area column in the close-up table and select the most suitable lens
plus Extension Tube combination.
Determine
the film-to-subject
distance
first
When it is difficult to get closer to your subject, determine the desired film-to-subject dis-
tance first. As the picture area varies with the focal length of each lens, select the most
suitable lens plus Extension Tube combination by referring to the data in the close-up table. l
Exposure
Factor
In close-up photography, you must adjust the exposure according to the length of the Exten- cj
sion Tube, as the amount of light decreasesasit passes
through a greater distance. Exposure
varies according to the combination of lens and Extension Tubes. Refer to the data in the
close-up table for the exposure factor that shows how much to compensate for correct
exposure. No exposure factor compensation is needed when the exposure reading is made
with the 6X7 TTL Pentaprism which will be available in the near future. ,&
untr" id*b-
Table155mm
t/3.5
0.20
0.45
0.70
0.95
1.21
1.46
1.71
1.96
13.85
X I1.04
6.06X 4.83
i 3.88x 3.09
2.85X 2.27
2.26X 1.80
1.87
X 1.49
1.59
X 1.27
cm
35.14
X28.01
15.38X 12.26
9.85X 7.85
7.24X 5.77
5.73
X 4.56
4.74y. 3.77
4.04X. 3.22
3.52X 2.80
Piclure Areq Film-to-rubiect
distonce
cm inches
Exposure
foctor
x
1.3
x 1.6
x 2.0
x2.5
x 3.0
x 3.5
x4.l
x 4.8
45.0
30.6
27.5
26.8
27.0
27.6
17.73
12.06
10.84
r
0.56
10.64
10.87
I1.23
11.58
f;r: :
,8.5
I
2e.4
L
4,ti*:-:..alar.i,t*! r,
(Distonce
scole set ot 0.45m)
Mognificofion Extension lube
combinolion
Not used
l-.
2
2+1
3
3+l
3+2
3+2+
rI t"] r.r0
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Table 275mm f/4.5
0.15
0.33
0.52
0.71
0.89
r.08
1.27
1.4s
Not used
I
2
2+1
3
3+l
3+2
3+2+
r
37.85
16.57
r
o.6o
7.80
6.17
5.10
4.35
3.79
cm
47.48X
20.78y.
13.30x
9.78x.
7.74X
6.40
x
5.45X
4.75X
Picture Areo Film-to-subiect
dislonce
cm incher
-f*
I
70.0
|
Exposure
foctor
xl.2
x
1.6
x
1.9
x 2.3
x 2.8
x3.2
x 3.8
x4.3
I incher
F.,..r,
xr4;
I r.tex6.s3
| ,.rox
4.rB
I s.esx 3.oZ
| 3.05
x 2.43
| 2.52x 2.01
| ,.'ut 1.71
l__
1.87x 1.4e
42.3
35.6
33.
r
32.4
32.3
32.7
33.3
27.58
16.67
r
4.03
13.04
12.77
12.73
12.88
13.12
5
l-t,'.,.-
(Distonce scqle sef ot 0.7m1
Mognificotion Extension tube
combinolion
.*itas" .1,,, 'q\- t ..:.. - l-A ' :-, -..), -* ^
Table
3 lo5mm t/2.4
0.13
0.27
0.40
0.53
0.67
0.80
0.93
1.07
Not used
I
2
2+1
3
3+r
3+2
3+2+r
51.38X40;95
25.78y.20.55
17.21X-13.72
12.91X-10.29
10.33
X 8.24
8.61X 6.87
7.38X 5.89
6.46X 5.1
5
inches
20.24x16.13
r
0.16
X 8.10
6.78X 5.41
5.09
X 4.05
4.07
X 3.25
3.39X 2.71
2.91X 2.32
2.55
X 2.03
4r.4
I 16.31
+r.+
| re.sr
Picture Areo Film-to-subiect
distonce
cm incher
100.0 39.40
62.4 24.59
50.7| 19.98
45.6
i 17.97
43.r
I r6.98
41.8 | 16.47
Exposure
foctor
x t.3
x 1.6
x 1.9
x2.2
x2.6
x 3.0.
x 3.5
x 3.9
6
(Disfonce scole sel qt lm)
Mognificotion Extension lube
combinqlion
;;di.sdd",, ,'.&** .;i.M!i :r***,#:ul*laiil* "
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Table
4150mm
t/Z.e
0.r3
0.22
0.31
0.41
!.50
0.59
0.69
0.78
cm
55.35
X44.1
2
31.65X25.23
22.16)/.17.67
I
7.05X 13.59
13.86
X r
1.04
l l.67
X 9.30
10.08
x 8.03
8.87
X 7.07
Areq
inches
21.81
x 17.38
12,47)<
9.94
8.73X 6.96
6.72X 5.35
5.46X 4.35
4.60
x 3.66
3.97X 3.16
3.49X 2.79
(Distonce scole set ot l.Sm)
Mognificotion Extension tube
combinotion
Not used
I
2
2+l
3
3+l
3+2
3+2+
I
Film-to-subiect
distonce
'cm I
inches
99.7
80.5
74.8
65.3
61.9
59.8
59.1
0
39.28
31.72
27.90
25.73
24.39
23.56
58.6 23.09
Exposure
foctor
x l.6
x 1.9
x2.2
x2.6
x2.9
x 3.3
x3.7
tj
I
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