Focusing Screens - Olympus 1 Instructions Manual

Focusing Screens

Interchangeable Focusing Screens are
often thought of as a luxury feature in
35mm photography. Yet the Standard
Focusing Screen 1-13 is often inconvenient
or difficult to use, and in some circum-
stances it is quite unsatisfactory. With
super-telephoto lenses for instance, the
microprism becomes excessively dark.
With the high magnifications of macro-
photography and photomicrography, it
is impossible to focus.
The feature of each Focusing Screen is
listed at right. The 1-3 and 1-13, suita-
ble for general photography, are particu-
larly advantageous when taking a sub-
ject with vertical lines. The 1-5 is ideal
for the snap-shooters using a wide angle
lens. The 1-4 and 1-7 are designed for
super-telephoto lenses and
1-11 and 1-12 are for close-ups, macro-
photography and photomicrography.
The 1-5, 1-6, 1-7 and 1-9 are not used
with the exposure meter built in the
camera.
Dioptric Correction Lens 1
Available in 8 diopter corrections: + 2,
+ 1, 0 (for hypermetropia); –1, –2, –3,
–4, –5 (for myopia). Used to correct
the photographer's vision, and espe-
cially necessary in fine focusing for high
magnification. Fits into the Eyecup 1.
TYPE
1-1
Microprism-matte
type
(for most lenses)
1-2
Microprism-matte
type
(for standard &
telephoto lenses)
1-3
Split image-matte
type
(for most lenses)
1-4
All matte type
(for most lenses)
1-4, 1-10,
1-5
Microprism-clear
field type
(for wide angle &
standard lenses)
1-6
Microprism-clear
field type
(for standard &
telephoto lenses)
1-7
Microprism-clear
field type
(for super
telephoto lenses)
FEATURES
Standard type, suitable for general photography.
Fast and accurate focusing is done on the central
microprism spot as well as on the surrounding
matte area. When a lens with a maximum speed
of F5.6 or slower is used, the microprism darkens
and focusing must be made on the matte area.
The meter needle indicates proper exposures.
Suitable for general photography in conjunction
with a standard or telephoto lens. Focusing is
done on the microprism spot as well as on the
matte area. When a lens with a maximum speed
of F8 or slower is used, the microprism spot darkens.
The meter needle indicates proper exposures.
Suitable for general photography ensuring critical
focusing, and ideal for photographers who prefer
the split-field and coincidence type focusing. When
a lens with a maximum speed of F5.6 or slower is
used, the split prism darkens. The meter needle
indicates proper exposures.
Suitable for general photography and ideal for
photographers who prefer a view field free from
microprism or split prism and for those who are
accustomed to focus using matte area. Also suit-
able for super telephoto photography and close-up
photography in conjunction with macro lenses and
Auto Bellows. The meter needle indicates proper
exposures.
This transparent screen provides an exceptionally
bright finder image. Highly suitable for snapshots
using wide angle lenses. The lack of matte surface
means depth-of-field effects cannot be ascertained.
The meter needle does not indicate proper exposures,
because its movement varies depending on the lenses
used.
This screen provides an extremely bright finder
image. Focusing is done on the microprism spot.
The lack of matte surface means depth-of-field
effects can not be ascertained and the meter
needle does not indicate proper exposures.
Developed primarily for use with super telephoto
lenses, this clear field screen provides an extremely
bright finder image. The microprism spot remains
bright even with a lens whose maximum speed is
F11. The lack of matte surface means depth-of-field
effects cannot be ascertained; the meter needle
does not indicate proper exposures.
44
TYPE FEATURES
1-8 This screen is ideal for use with super telephoto
All matte type
lenses of 300mm or more in focal length, or for
(for telephoto
astrophotography. The extreme fineness of the
lenses & matte surface permits outstanding field definition.
astronomical More accurate focusing may be achieved by the
use of the Varimagni Finder.
telescopes)
1-9
Designed for use with OLYMPUS fiberoptic endo-
Clear field
scopes. This condenser type screen without fresnel
type
lens requires no focusing when a special adapter
(for endoscopic couples the camera with the fiberscope. Exposure
photography) is made automatically by the light supply.
The reticule engraved on the all-matte surface is
used for vertical and horizontal picture alignment.
1-10
Though originally designed for architectural photo-
Checker-matte
graphy with the Shift lens, it is also suitable for
type
general and super-telephotography, and close-up/
(for Shift lens)
macrophotography with macro lenses and Auto
Bellows.
Highly advantageous for close-up and macrophoto-
graphy with Auto Bellows and extension tubes.
1-11
For focusing in low magnification close-up photo-
Cross hairs-matte
graphy, use this matte area, and in macrophoto-
type
graphy greater than life size, use the double cross
(for close-up &
hairs the same way as with the 1-12. The meter
macro-
needle indicates proper exposures, but depending
photography)
on the conditions of the specimen, the reading
must be compensated for.
The transparent screen offers the photographer
1-12
focusing with an unusually bright finder image.
Cross hairs-clear
To focus, first correct your diopter using a dioptric
field type
correction lens or Varimagni Finder so that each
(for photo-
line of the double cross hairs can be seen clearly
micrography &
and separately. Then bring the specimen into focus.
macrophoto-
The meter needle indicates proper exposures, but
graphy greater
depending on the specimen's conditions, the reading
than life size)
must be compensated for.
Most suitable for normal photography, this screen
assures pinpoint focusing. The central split-image
1-13
rangefinder is encircled by a microprism collar.
Microprism/split
Since the outer area has a matte surface, the screen
image-matte
can be used in the same way as the standard 1-1
type
and 1-3 Screens. When a lens with a maximum
(for most lenses)
speed of F5.6 or slower is used, the prism darkens
and the focusing must be made on the matte area.