FINAL REPORT COLOR CORRECTED 20X LENS FOR THE 10-20-40X PRECISION ENLARGER

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A000800150001-8
• Release Decision: RIPPUB
• Original Classification: U
• Document Page Count: 27
• Document Creation Date: December 28, 2016
• Document Release Date: July 2, 2004
• Sequence Number: 1
• Publication Date: August 27, 1964
• Content Type: REPORT

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FINAL REPORT
Color Corrected 20X Lens
for the
10-20-40X Precision Enlarger
27 August 1964
Prepared by:
STAT
Declass Review by
NGA.
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TABLE OF CONTENTS
Page
I
Summary
iii
II
Subject
1
III
Task/Problem
1
IV
Introduction
1
V
Discussion
1
A. Phase I -
Lens Design
1
B. Phase II
- The Lens Sample
10
C. Comparison
of Phase I and Phase II Lenses
15
VI
Conclusions
16
VII
Recommendations
16
VIII
Appendix A
17
IX
References
19
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2
3
4
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LIST OF ILLUSTRATIONS
Title Page
Lens Design for the 10-20-40X 3
Precision Enlarger
Energy Distribution Curves for g Light (4358A) 5
Energy Distribution for e Light (5461A) 6
Energy Distribution for c Light (6563A) 7
Spot Diagrams - 20X Color Enlarger Lens, 8
Tropel 5829
Enlarged Prints (10X) of 20X Enlargements made
on Type 44o4 Film with Lens and Lights Filtering
as noted
9
Sample Color Transparency Made on the 10-20-40X 13
Precision Enlarger Using a 52mm Lens
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SUMMARY
The original lenses installed in the 10-20-40X Precision Enlarger have
a narrow band color correcticn which prevents their use with color film,
therefore a project was authorized to design a high performance lens for use
with color films.
In Phase I of this project, a subcontract was let to
1? STAT
design a special purpose high performance lens corrected for sequential narrow
band exposures in three spectral regions suitable for color print making.
At a later date, Phase II was initiated as an amendment to the project
to provide the 10-20-40X Precision Enlarger with the interim capability of
producing color prints until a specially designed
ble for use. In Phase II, a sample
built by
tested in the
lens should be availa-
52mm document reproduction lens
was purchased for this purpose and installed and
10-20-40X Precision Enlarger.
Both phases of the project resulted in suitable designs. The 52mm
lens provided adequate performance for making maximum quality prints from
existing production and experimental color materials. This lens was corrected
for the full visible spectrum and, thus, was more convenient to use. For this
reason, it is recommended in preference to the
lens design for
20X color enlargements. A secondary feature of the 521nm I 'Lens is that
it can be used to produce variable contrast black-and-white prints.
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STAT
STAT
STAT
STAT
STAT
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SUBJECT: Color-Corrected 20X Lens for the 10-20-40X Precision Enlarger
TASK/PROBLEM
1. Provide a 20X lens design that is suitable for use on the 10-20-40X
Precision Enlarger and also capable of producing enlargements from color film
originals with minimum loss of information content.
INTRODUCTION
2. The original lenses installed in the 10-20-40X Precision Enlargers
were corrected for a narrow spectral band to achieve maximum image quality
in projection printing of black-and-white photographic materials. Because
of this correction, their image quality over a wide spectral range (required
in color print making) was relatively poor. The availability of high image
quality in original aerial color photography, made possible by new film
technology, created a need for new projection printing objective lens designs
to produce color prints which preserve all the information present in the
original photographs.
DISCUSSION
3. The problem of providing a suitable 20X color lens has been approached
in two independent phases as follows:
a. Phase I - Lens Design
b. Phase II - Lens Sample
4. Phase I - Lens Design:
a. I 'Design Specification Number 103: Design Specification No. 103
for a high performance 20X lens corrected for sequential narrow band exposures
in three spectral regions was prepared and a subcontract was placed with
to design a lens that would be compatible with this specification. A
copy of this specification appears as Appendix A of this report.
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b. Phase I Plan:
(1) Using a 20X lens built to specification, a print was to
be made by three separate exposures in a time sequence from a given color
original onto a single sheet of color print stock. Each exposure was to
be made with a different narrow pass band color filter (one, red; a second,
green; and third, blue) to expose the three emulsions layers of the color
print stock in time sequence. A high precision mechanical system was to
be used to refocus the lens at its short conjugate between the various
exposures to achieve optimum image quality for each color of light.
(2) Although the proposed sequential printing approach using
the high performance 20X lens design increased the exposure time and the
mechanical complexity of the enlarger, it was felt that such a combination
also would increase the image quality over that which could be achieved by
single exposure with a lens corrected for the full visible spectrum.
c.
Lens Design:
(1) The
lens design shown in Figure 1 (a copy of
Drawing No. 5829) is a "Planar" type with the number of elements increased
over the usual six-element form. The increase in elements will "divide the
bending" and thus improve performance. A field flattening element is added
to improve the off-axis quality.
(2) This lens system which has been corrected for an over-all
object-image distance of 42.72 inches and a magnification of 19.7X has a
focal length of 5.059 cm and operates at effective f//3.0. The lens exhibits
no vignetting over the full format so the only loss in relative illumination
will be due to the cos4 effect. The photo negative is registered against
the plano surface of the field flattening elements so that any change in
focus is accomplished by shifting the negative and field flattener element
as a unit.
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-4-100.48 -"-
OBJECT DISTANCE
Figure 1,
APERTURE STOP ,
.867 D4 ( F/3.0 )
ALL AIMENSION3 Ali CENTIMETERS
IMAGE PLAI4 E
1.62 DIAIA
16 11
SuREXE
RADIUS
LEA0IR
APERTURE
THICKNESS
cm
SPACE
6L455
TYPE
Ne
(5461 il.)
V NO.
DIAMETER
I
7.9424
3.0:33
.350
ScAo-r I
LA K - 5
1.69400
54.80
3.23
2
-49.740
2.97 I
010
_
10
_
-
3
4.2505
2.81.1
.350
LAK-9
1(4400
54.80
3,01
4
4.3554
2.460
010
_
1.0
_
-
5
2.8040
2.515
.300
F-5
1,40718
38.02.
2.72.
6
1.9431
2.210
.851
SK-14
1.62287
40.29
2.72
7
-14.286
1.-752
380
F-5
1.60718
38.02.
2.15
8
1.4953
.242.i
1.288
_
1.0
_
--
9
-2.5433
1. 1 1, 3
.450
F-5
1.40718
38.02
2,11
10
1.8607
1.408
1,339
5K-16
142287
60.29
2.11
II
-14.991
1.912
010
-
1.0
--
-
12
2.0981
350
LAI(
1 69400
54.80
2,22.
IS '
-4.5148
2.022
.010
_
1.0
....._
_
14
3.7316
2.074
370
L A VC- '3
.
I.69400
54.80
2 25-
15
-24.246
2(50
I 63.5
-
I 0
ta
-3.5585
1.031
.322.
2I:-7
i.51871
64.20
1.83
17
0.0
t .620
EFL. (e LIGHT) = 5.059
MAGNIFICATION= 19.10 1
EFFEcTIVE F440. = F/3.0
WAVELENGTH RANGE
4358 - 6563
* I S k. - INCREASE By .0048 F.08 s C FOCUS
20X COLOR I...ENS
FOR
PRECISIN ENLARGER
JUNE 27,1%3
J K.5
?SCALE -
2.x
dwG 582 9
Lens Design for the 10-20-40X Pre,2ision. Enlarger
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(3) The residual distortion of this lens at the edge of the
field (1.62 cm diameter at the short conjugate) is +0.016 percent. At the
2/3 field point (1.08 cm diameter), the value is +0.014 percent.
(4) The aberrational correction has been optimized for three
spectral bands centered about 4358A (g-light), 5461A (e-light), and 6563A
(c-light). Because of the large spectral range involved, a focal change of
+0.048 mm is required for g and c wavelengths relative to the e wavelength.
To maintain good correction over the full spectral range, it was necessary
to use a triplet construction in the front-cemented lens group to better
control the lower rim rays.
(5) The energy distribution on axis at the 2/3 field point
and at the full field points for e, c, and g wavelengths is shown in Figures
2 through 4, and the corresponding spot diagrams are illustrated in Figure 5.
The image at the e-wavelength band satisfied the design goal of 90 percent
of the energy in a 3-micron diameter circle out to the edge of the field.
The requirement of a 4-micron spot size for c-light is also met out to the
edge of the field. In g-light, the 90 percent spot size is 3 microns at
2/3 field but increased to about 6 microns at the edge of the field.
(6) The magnification in the three spectral bands is such
that 97 percent of the total energy at the 2/3 field falls within a single
5-micron diameter circle with a center at H' = 0.53953 cm and at the edge
of the field 95 percent of the energy falls within a 5-micron circle centered
at H = 0.80952.
(7) From the nature of the spot diagrams shown in Figure 5,
it is felt that the lens design could produce an image in narrow-
band green light comparable to that produced by the original 20X Precision
Enlarger lens (M-171A) (see Figure 6c). Since the green-light (or magenta
dye) image is the most important of the three images in a color photograph
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MN NM NMI 1E111 1E11 1?111 =II INN MN MEI MN IMO IMO
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.002 .oc4 .006 .008
Spot Diameter (mm)
Field
.010
Figure 2, Energy Distribution for g Light (4358A),
Focus Shift (+.048mm)
20X Color Enlarger Lens (5829)
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il9 q-sri2nV T
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?TAT
IIIIII MIMI MI NM MIN MIN 1E11 MIN 111111 =II Ell IIIIII MIN
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100
80
20
2/3
Axis
Field
Full
Field
20X Color Enlarger Lens (5829)
.002 .oc4 .006 .008
Spot Diameter (mm)
.010
Figure 3. Energy Distribution for e Light (5461A)
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?
L-d
5 STAT
MI MI NMI 111.1 IIIIIII INN =I NIB Nal MIN Mil
100
20
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2/3 Field
Axis'/
?
/
/
Full
Field
/
/
/
i
/I
I
1
II
I i
I i
1/
i
/
li
/11
/ I
f i
/
I /
I I.
1/
20X
Color
Enlarger
Lens
(5829)
/
il
.002 .0o4 .006 .008
Spot Diameter (mm)
.010
Figure 4. Energy Distribution for c Light (6563A),
Focus Shift (+.048mm)
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STAT
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4358A
. *I t?
? ?? ? ? ?? ?
??
A =546/A
).?Is 6563A
NOTE: THE CIRCLE ON EACH SPOT DIAGRAM
REPRESENT'S THE FIRST MINIM/Id OF THE
DIFFRACTION R4TTERN FOR A PO/NT SOURCE IMAGE
Figure 5, Spot Diagrams - 20X Enlarger Lens
5829
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MI
411PS
IltShe
E
IDE
su
a) 52mm, lens,
full visible spectrum.
b) 52mm. I lens,
green filter (W99).
C) 50mm. MI71A lens,
narrow hand blue filter
(Fabry-Perot, peak at 4050A).
Fgare 6. Eniared Prints (10X) of 2DX Enlargemen s Made riTTee 44.T'
with Lens and Lights Filterlin?: as N had
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JAT
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with respect to the appearance of sharpness, the
lens is apparently
equivalent in image quality for color to the M-171A lens for black-and-white
photographs. With a green filter and orthochromatic print stock, it might
serve as a substitute for the M-171A lens in making black-and-white prints.
5. Phase II - Thel JLens Sample: This phase of the project was
initiated as a contract amendment to the original project authorization in
an attempt to provide the 10-20-40X Enlarger with an interim capability of
making 20X color prints and black-and-white prints on variable contrast
paper (blue and green sensitive print stock) until a specially designed
lens should be available for use.
6.
a.
pens Tests and Results:
A sample lens (a 52.7 mm
lens built by
had been tested as a document reproduction lens by another optical
engineering group. This lens was procured and installed in a spare gate
and focusing assembly and tested on the 10-20-40X Precision Enlarger Ser.
No. 002 by making enlargements of reproduction target patterns. In this
test, both High Definition Aerial Film (Estar Thin Base), Type 44o4,
a panchromatic film, and Special Ortho Aerial Duplicating Film, Type
SO-242 were used with various types of color filters to learn lens perform-
ance in various spectral regions. The
STAT
STAT
lens performance was also STAT
compared to that of the original 20X Precision Enlarger lens (M-171A) with
its narrow band interference filter. The details of this test and the
resolution values are shown in Table 1.
b. Three 10X enlarged prints made from the 20X enlargements of
high-quality 3-bar resolution target patterns (derived from USAF 1951) are
shown in Figure 6. Print (a) was made with the
lens corrected for
the full visible spectrum; the same lens corrected only for green light was
used to make print (b); in making print (c), the 50-mm M-171A lens was used
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11111 MI MN NE MN EN NE 1111 111111 EN NM MN ION En NM
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STAT
STAT
Lens
TABTF 1
RESOLVING POWER TESTS OF 20X COLOR TgNS FOR THE 10-20-40X PRECISION ENLARGER
Filter
W2B
(UV Blocking)
W99
(Grocn)
Interference
4080A peak
Type 44o4 Film
(Panchromatic)
Spectrum
Resolution* Band
406/327 Full
Visible
406/389 Green
only
645/351 Narrow
Band Blue
Type SO-242 Film
(Orthochromatic)
Spectrum
Resolution Band
406/368 Blue &
Green
406/389 Green
only
Type 8430 Film
(Color Blind)
Spectrum
Resolution Band
645/534 Narrow
Band Blue
Resolving power values are expressed as lines/mm at the short conjugate of the lens. The
number before the slash (/) is resolution on axis. The number following is the geometric
mean of the average radial resolution and the average tangential resolution at the "corners"
of the field (6 degrees off axis).
** This 1/2.0 lens which has a focal length of
This 1/2.0 lens which has a focal length of
Enlarger byl I In these tests it is used
with peak transmittance at 4050A.
52.7mm was used at f4.o in these tests.
50mm was made especially for the 10-20-40X
at 1/2.8 with a narrow band Fabry-Perot filter
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with its narrow band second order Fabry-Perot interference filter. The 20X
enlargement for the images shown was near the lens axis and was exposed on
Type 4404 film (high-definition, extended panchromatic sensitizing) for all
examples. The image sharpness of print (b) is considerably greater than
that of print (a). Also, the image sharpness of print (c) produced by the
M-171A lens with its narrow _spectrum band is considerably greater than that
produced with the lens corrected for a broad spectrum range.
c. A 20X color transparency which was made on the 10-20-40X
Precision Enlarger with the 52mm
lens is shown in Figure 7.
d. The line spacing (lines/mm) of various test pattern targets
for the 20X enlargements is shown in Table 2. The diameter of the Airy disc
which in theory would just resolve the particular target is also given in
this table. As a rough comparison, this diameter may be equated to the
diameter of the circle which included 90 percent of the rays (see Figures 2,
3,
and 4) to predict:
(1) The resolution capability of a lens design
(2) The energy distribution due to aberrations and diffraction
of a lens being tested.
e. In the practical test of making 20X color enlargements from
high-quality original aerial photographs with the lens, no image de-
gradation is known to be caused by the lens. In addition, there is no
observable color fringing, no apparent loss of detail in the corners of the
print, or noticeable image distortion. Thus, the lens quality apparently
exceeds requirements placed on it by production or experimental color materials
now available.
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4.0.0.1110...110100.1
,
4V
?
Figure 7. Sample Joisr Tgansparency Made on
Precision Enlarger Using a.
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TABLE 2
RESOLUTION TARGETS USED TO TEST LENSES
(See Figure 6 and Table 1)
Target
Group
Number
Chart
Line Spacing
Airy Disc Dia. to
Resolve the Target
(Rayleigh Criterion)
6
1
64.o lines/mm
.031mm
2
71.8
.028
3
80.6
.025
4
90.5
.022
5
101.6
.0197
6
114.0
.0175
7
1
128.0
.0156
2
144.0
.0139
3
161.0
.0124
4
181.0
.0110
5
203.0
.0098
6
228.0
.0088
8
1
256.0
.0076
2
287.0
.0070
3
323.0
.0062
4
362.0
.0055
5
406.0
.0049
6
456.o
.0044
9
1
512.0
.0039
2
575.0
.0035
3
645.o
.0031
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f. The test using orthochromatic film Type SO-242 was conducted
to learn the performance of the lens for exposing variable contrast black-
and-white print materials. In these materials, a change in the relative
amount of green versus blue exposing light controls the print contrast.
Therefore, a lens for printing on these materials must be corrected for
blue and green light.
7. Comparison of Phase I and Phase II Lenses:
a. In making (a) 20X enlargements from present production and
experimental color film and (b) 20X enlargements on variable contrast paper
for briefing chart use, the 52mm lens is recommended over the
lens design because:
(1) In the test conducted in Phase II of the project, the 52mm
lens appeared to be adequate for 20X color prints and for 20X variable
contrast black-and-white prints.
(2) The lens is not restricted to the time sequence of
for the
exposures proposed for the special lens designed by
project and, thus, is more convenient to use.
(3) Being a commercial item, the
at lower cost than the special design
The recommendation of the
lens.
lens is readily available
lens over the more sophisticated lens for
making 20X color enlargements is upon the basis that no appreciable improve-
ment in print quality would be obtained from the present original color photo-
graphs.
b. For 10X and lower magnification, it is recommended that the two
lens designs be compared again because it cannot be assumed that the same
conclusions will hold for the necessary longer focal length versions of the
two lenses. In increasing the focal length of a lens, the geometric,aberra-
tions are increased in proportion to the focal length increase. At the 50mm
focal length of the samplesin this test, the geometric aberrations in the
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lens are sufficiently small to be unobjectionable relative to the
quality of available original color material. This may not be true, however,
at twice the focal length.
CONCLUSIONS
8. The predicted performance of a lens made to the
better than
enlargements.
9. The
design is STAT
specification and should provide excellent 20X color
Ilens quality apparently exceeds the requirements placed
on it by production or by experimental color materials now available. Further-
more, this lens is judged adequate for 20X enlargements upon variable contrast
black-and-white paper for briefing chart use.
RECOMMENDATIONS
10. The lens is recommended over the lens. (See paragraph
7a and b).
11. For 10X and lower magnifications, the two lenses should be compared
again since it cannot be assumed the same conclusions will bear up at the
longer focal-length version of the two.
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APPhNDIX A
DESIGN SPECIFICATION
FOR
20X COLOR LENS FOR 10-20-40X PRECISION ENLARGER
Focal Length:
Aperture:
Magnification:
Short Conjugate
Field Diagonal:
Long Conjugate
Field Diagonal:
Angular Field:
Wavelength Range:
Corner Illumination:
Distortion:
Performance:
Approximately 2.0 inches. (Overall conjugate
distance 42.80 inches)
1/2.0 to 1/4.0 - may be selected from this
range for optimum image quality.
20:1
0.368 inches
12.75 inches
Approximately 9 degrees
Three narrow spectrum bands (70 to 100
Angstroms half pass band width) centered about
4358A, 5461A, and 6563A, respectively.
Should follow Cos4 law if this does not reduce
image quality. No vignetting is a desirable
condition.
Less than 0.05 percent
In the short conjugate, the design goals are:
(a) In the band centered about 5461A, 90
percent of the rays should fall within a
3-micron circle over at least 6 degrees of
the field.
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31 August 64
(b) In the bands centered about 4358A and
6563A, 90 percent of the rays should fall
within a 4-micron circle over at least
6 degrees of the field.
(c) Magnification in the three spectrum bands
shall be such that 90 percent of the rays
from the three bands fall within a single
5-micron circle over at least 6 degrees
of the field.
(a) The negative will be registered against
the plano surface of a glass element
between the film and the main lens assembly.
This element may be a .125-inch thick
plate (C-1 glass) or it may be a "field
flattener" with one plano surface at the
focal plane.
(b) If the lens performance is improved by
doing so, the short conjugate distance in
the system can be adjusted by moving the
negative gate between sequential exposures
in the three spectrum bands.
-18-
Approved For Release 2004/07/29 : CIA-RDP78604770A000800150001-8
Approved For .ase 2004/07/29 : CIA-RDP78B047741)0800150001-8
PAR 3
31 August 64
REFERENCES
1. Project Authorization Request, Color Corrected Lens for 25 April 63
the 10-20-40X Precision Enlarger, PAR 3
2. Quarterly Reports, PAR 3, Contract EB-1492
-19-
1 July 63
1 October 63
17 January 64
31 March 64
28 June 64
Approved For Release 2004/07/29 : CIA-RDP78604770A000800150001-8
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FORM NO.
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1 AUG 54 WHICH MAY BE USED.
(47)
Approved For Release 2004/07/29 : CIA-RDP78604770A000800150001-8
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