The plane of sharpness and depth
of
field
Locating the plane
of
sharpness with the SINAR p2 und c2
Always establish the plane
of
maximum sharpness before stopping down.
Select this as
an
imaginary subject plane with the greatest near-to-far spread
of required object points.
Locating the plane
of
sharpness with the rear standard (controls both sharp-
ness distribution and perspective)
- Always set the standards vertically with the coarse tilt
8.
- With the fine focusing drive 2 sharply focus a suitable first image
point'
on
the horizontal axis H (or
on
the vertical axis V for a vertical-axis swing).
- With the micrometer drive 5 (or 6 for vertical-axis swings
)T
ocus on a suit-
able second image point - roughly opposite the first -
in
the shaded area
of the screen.
Locating the plane of sharpness with the lens standard (controls sharpness
distribution but not perspective)
- Locate the plane of maximum sharpness with the rear standard as de-
scribed above, then read off the tilt or swing angle.
Direct tilting and swinging with the lens standard
is
not satisfactory as its optical
setup always involves
an
overall sharpness shift.
- Then tilt the lens standard -
in
the same direction - to the same angle.
r
- Return the rear standard to its zero engagement point.
- Refocus with the fine focusing drive 2 for maximum overall sharpness. Ad-
just the rear standard for any final correction
to
the plane
of
shapness.
* If there
is
no suitable image point
on
the tilt
or
swing axis itself, select one nearest to
that axis and focus
as
described. Repeat the adjustment sequence until the image is
sharp all
over..
Locating the plane
of
sharpness with the SINAR f2 and
f1
Always establish the plane of maximum sharpness before stopping down.
Select this
as
an
imaginary subject plane with the greatest near-to-far spread
of require object points.
- With the fine focusing drive 2 sharply focus a first image point on the hori-
zontal axis H (or
on
the vertical axis V for a vertical-axis swing).
- Set the angle-metering scale 6
to
zero.
- With the fine focusing drive 2 sharply focus a second image point on the
opposite axis H' (or V').
- Read off the tilt angle and direction
(+ or
-)
on the angle-metering scale 6
(for example
+ 12°).
If the range of the angle-metering scale
is
not sufficient, tilt the camera setup ap-
proximately before measurement, using the intersecting planes principle. .
- Set this angle
(12
°) and direction (here +) on either the image or the lens
standard.
- Fine-focus 2 for optimum overall sharpness. Adjust the'rear standard for
any final correction
to
the plane
of
sharpness.
Lens tilts and swings with close-ups
With close-ups (subject distance less than five times the focal length) any
lens tilt causes additional problems
as
it also modifies the subject distance.
Here it
is
therefore better
to
control sharpness distribution with the rear stan-
dard only. If you still want to tilt the
.lens
standard, adjust the lens tilt first
by
visual sighting (Fig.
42)
to
make the planes
of
the subject, lens and image
meet
in
a common axis. Make any final adjustments again on the rear stan-
dard.
H
Fig
.
39
v
Fig.40
Fig
:4
1
r-@-.,
I I
(0 0
I I
L_@_"
Fi
g.43
11
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