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SPIRATONE
AUXILIARY
,
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The
5,.UIOIII
Auxiliary Fish-Eye lens can be used successfully with just about any camera from 8mm
movie to 8X 10" view! In conjunction with normal focal length lenses, the Auxiliary Fish-Eye pro-
duces the typical circular Fish-Eye format with 180· coverage. The afocal auxiliary design of the
.$'IUIOII
Fish-Eye has many distinct and unique advantages over"prime"Fish-Eye lenses. Among
them:
*
An almost universal adaptability to a wide va rietyof cameras and prime lenses.
*
The ability to function with various focal length lenses, yielding, in each particular co mbination, a
resultant focal length of .15X the prime focal length. Example: 50mm focal length is converted
to 7.5mm, 135mm is converted to 20.25mm and so on.
*
The normal camera viewing system is used, so that with SLR c arne r a s , the mirror need not be
locked up, out of the way, and focusing and composing is done normall~'on 'the groundglass in the
usual manner.
*
In conjunction with the focusing mount of
the prime lens, objects as close as
+"
from the front of the Fish-Eye can be
brought into sharp focus.
OPERATING
INSTRUCTIONS
FISH- EYE LENS.
The Auxiliary Fish-Eye lens ~ suitable for
virtually all types of cameras inclmttTr;r""'"'''''"'''''.
,J.._~
Super 8mm and 16mm, as well as 35mm
movie cameras;
T. V.
cameras; subminia-
ture cameras; half size and regular size
35mm range finder and single lens reflex
cameras; 2-;\-X2-;\-". 4X5", 5X7". 8X10"
view and press cameras.
The Auxiliary Fish-Eye lens is not recom-
mended for use with wid eang le lenses (result-
ing diameter of circular image too small).
for lenses longer than 200mm (resultIng
speed too slow), some zoom lenses (both dia-
meter of circular image and image quality
may be unsatisfactory). prime lenses into
which Fish-Eye cannot be screwed or bay-
oneted (slip-on fittings are not suitable),
lenses with a greatly recessed front element
(may cause vignetting due to increased dis-
tance between prime and auxiliary lens).
FOR
THE
SPIRATONE
AUXILIARY
I
SPECIFICA TIONS
Lens construction:
Angle of View:
10 elements. 6 groups.
180· maximum: variable in
coniunc-
tion
with
telephoto lenses.
I
3.5 maximum (in conjunction with
Aperture (resultant
f
value):
30mm lens), £/5.6 in conjunction with
50mr.l
lens.
Resulting Focal Length: O. 15X the prime lens focal length.
Circular Field Diameter: O. 427X the prime lens focal length.
Focusing:
Fixed focus. However, focus adjust-
ment of prime lens brings objects as
close as -tinch from front of Fish-
Eye into focus.
r,
,
Aperture guide dot
Aperture scale
Ape-rture setting ring (5 'stops- cl ick
setting)
Guide ring for prime '1ens' focal length
Focal length scale (ot-prime lens)
Set-Screw for orienting lens
@
®
®
(Fig. 1)
CALCULA TION OF DIAMETER Of CIRCULAR FIELD.
The diarne
tar
cf thle- circular field is directly proportional to the focal length of the prime lens. Simp lv
multiply the :fu~·a.t:;re'~~ih·,by .427 to dete~mine the field size.
• ~ , "-$- .•.
Example: ,~f.~,i,5.?mmpr.ime lens (50X.427)=21.4mm
-.', ••. :···~~~~a.."m.~. ", .. '" (80X.427)=34.4mm
r•• :~;;..
··,'J;OO'fu"i'::_'·tv.~
~"(1
00 x .42 7) =42.7 mm
•• ~ «p.
t.. ~ .••.. :; • "' .....
. ~~.~~~*·i~S,l.mr::'" -, ~(l35x.427)=57.7mm
"'-'l"
'''I.:'
With normal 50mm lens With 50mm lens and Fish-Eye
With 135mm lens and Fish-Eye
MOUNTING THE AUXILIARY FISH-EYE TO THE CAMERA LENS.
The Spir ato ne Auxiliary Fish- Eye is sup-
plied with an inte rcha nge a ble rear custom
Ii
tti
ng which matches the front threads or
bayonet of a specific camera lens of your
choice. These fitt ing s are available in
most popular size threads including '34,
35.5,40.5, 43, 46, 48,49,52,55,58,
60,62, and 67mm. plus various bayonet
and series s izefi
tti ng s ,
Simply screw the appropriate custom
rear fitting onto the back of the Fish-
Eye. Thread or bayonet the Fish- Eye
into the front of the camera lens.
Avoid mounting the Fi s h-Eye with s lip-
on or set screw adapters, sinc ethes e
tend to be precarious and shift the attach-
ment off the opticaIaxis.
ORIENTING THE FISH-EYE
--Y(the'
aperture scale of the Fish-Eye is
not centered in the upright position,
loosen the s et-screw in the base ring
[Fig.l.®J of the Fish-Eye. rotate the
lens to the desired position and retighten
the s et-screw.
e
e
r
,i~.!?
...,'
d
I
On SLR and other camera's with groundglass viewing screens, viewing is direct. With non-groundglass
cameras, the approximate field coverage can be estimated by holding the Auxiliary Fish-Eye in front of
one's eye-it will indicate the approximate field covered by the camera with the Fish-Eye attached.
An accessory viewfinder is available for 35mm cameras·
On twin lens reflex cameras, the Fish-Eye can be shifted from the top lens for viewing and focusing to
the lower lens for actual shooting.
It is difficult to visualize the extreme angle of coverage of the Fish-Eye,even when using a reflex view-
ing system. The usual position of tripod legs, your hat, or even your own feet may show in the Fish-
Eye picture unless you take special care to avoid this.
SETTING THE FOCAL LENGTH SCALE.
Rotate the focal length scale so that the
focal length of the prime (camera) lens
is set opposite the red dot reference
mark. Setting this focal length scale
shifts the diaphragm scale, indicating
the f stops available with that particular
focal length combination. In termediate
settings of the focal Ieng th scale may
be used where required.
VIEWING AND COMPOSING.
..
FOCAL LENGTH - APERTURE
RELA TlONSHlP
Effectivefva~e Focal L:ngth
~----- Intermediate ------
Value
,-- Indicated----,
f 3. 5 30mmor shorter
f4 35
f
4.4 40
f5
. 150
180
f6.2
45
50
55
58
70
...........
80
85
..···..·······90
100
105
127
135
f
5.6---+----
f
6. 4
---+---
f8
f9 - .
f
9.4
---+----
flO.1
f11--+---
f11.8······
f
13.2
fl6---+---
f 16. 9 " .
f
2
0.1 ..
f22
---'----200
FOCUSING.
'MIi1e the Auxiliary Fish-Eye has no focusing mount of its own, with SLR and view cameras the
focu s ing mount of the prime lens is effective in varying focus to objects from infinity to only +" from
We lens. With the prime lens set to infinity, the depth of field of the Fish-Eye extends from about
3 feet to infinity. At smaller openings, depth of field at the infinity setting may extend to as close as
1+ feet. With non-reflex cameras, the infinity setting should be used at all times.
OPERATING THE DIAPHRAGM.
Always set the diaphragm of the camera lens to its maximum aperture(wide open). Rotate the d ia-
phr agrn control ring of the Fi s h-Eye to the desired f stop· the f stop shown On the Fis h- Eye dia-
phr a grn scale is accurate for that focal length setting, and no further compensation is required.
For optimum de finition, an aperture setting of 2 or 3 stops below the maximum opening is r ecomrne n-
ded.
EXPOSURE.
Exposure is determined in the usual manner, depending on the opening at which the diaphragm of the
Fish-Eye is set. On cameras on which the Fish-Eye covers all or part of the built-in electric eye, the
exposure mechanism must be operated manually. When measuring exposure by means of a separate
meter,it is important to keep in mind that the average meter covers an angle consideraderably na r r o we r
than that covered by the Fish-Eye, and that the subject may include areas of g r eatly
varying bright-
ness which should be measured separately, with such exposure selected to best record the most signifi-
cant part of the subject within the total field.
On cameras with through-the-lens metering system, care ~hould be taken that the meter reading
area is within the picture field·. ~eters that integrate the entire groundglass image will give a false
reading unless the Auxiliary Fish-Eye is used with 135mm or longer lenses to yield an image cover-
ing the entire film format.
When the Fish-Eye is used with shorter than 135mm focal length lenses On 35mm through-the-lens
meter reading cameras, a separate exposure meter should be used to establish correct exposure.
CARE OF THE FISH- EYE LENS.
The extreme curvature and exposed position of tht> front element requires special care in handling and
storing to avoid touching and damaging the glass surface. Keep the special cap on the Fish-Eye at all
times, except when actually shooting. Brush gently to remove dust and, if necessary, wipe the lens
with as light a touch as po s sible, _
WARRANTY.
The Spiratone Auxiliary Fish- Eye lens is unconditionally guaranteed aga.instdefects in manufacture
and workmanship for a period of 90 days after date of purchase; dur ing that period, any repair or
adjustment necessitated by r e as on of defect or as the result of normal hand ling will be taken care
of by us without charge, provided no repair attempts have been made on it by any unauthorized party.
SPIRATONE, INC.,
135-06 Northern Blvd., Flush ing, New York 11354.
Printed in Japan
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