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Simple Telescope Kit

Simple Telescope Kit

Simple lenses are subject to optical aberrations. In many cases these aberrations can be compensated for to a great extent by using a combination of simple lenses with complementary aberrations. A compound lens is a collection of simple lenses of different shapes and made of materials of different refractive indices, arranged one after the other with a common axis.
If two thin lenses are separated in air by some distance d (where d is smaller than the focal length of the first lens), the focal length for the combined system is given by


for1_1.jpg

The distance from the second lens to the focal point of the combined lenses is called the back focal length (BFL).


for2.jpg

If the separation distance is equal to the sum of the focal lengths (d = f1 + f2), the combined focal length and BFL are infinite. This corresponds to a pair of lenses that transform a parallel (collimated) beam into another collimated beam. This type of system is called an afocal system, since it produces no net convergence or divergence of the beam. Two lenses at this separation form the simplest type of optical telescope. Although the system does not alter the divergence of a collimated
beam, it does alter the width of the beam. The magnification of such a telescope is given by

for3.jpg

 which is the ratio of the input beam width to the output beam width. Note the sign convention: a telescope with two convex lenses (f1 > 0, f2 > 0) produces a negative magnification, indicating an inverted image. A concave plus a convex lens (f1 < 0 < f2) produces a positive magnification and the image is upright.

Note that distance between lenses d is the distance between focal planes of the lenses and is given theoretically (the thickness of lenses is not included into calculation). It, also, depends on wavelength. The distance should be adjusted ±10 mm in each particular case.

We offer:
BK7 Simple Telescope Kit
Code Material Coating Item price, USD In stock Add to cart
140-0008 BK7 uncoated 1080.- Request Add to cart
141-0008 BK7 1064 nm, R<0.2% 1505.- Request Add to cart
142-0008 BK7 532 nm + 1064 nm, R<0.5% 1554.- Request Add to cart
147-0008 BK7 400-700nm, R<0.9% 1764.- Request Add to cart
Other antireflection coatings are available on request.

Each kit includes 8 lenses (3 pcs. of lens 1 and 5 pcs. of lens 2), Aluminium Optical Rail 810-0005-02, two Aluminium Rail Carriers 810-0007-06, Self- Centering Lens Mounts 830-0010 and 830-0020, two Rod Holders 820-0050-02 and two Standard Rods 820-0010-02.


List of lenses in the Kit
Lens 1 Focal
length f1, mm		 Lens 2 Focal length
f2, mm		 Distance between
lenses d=F1+F2, mm		 Magnification, M
BK7
BK7 bi/cv Ø12.7mm
114-0104		 -12.7 BK7 pl/cx Ø50.8mm
110-0502
110-0505
110-0507
110-0509
110-0511
+75
+100
+150
+200
+250
62
87
137
187
237
5.9
7.7
11.8
15.7
19.7
 BK7 bi/cv Ø25.4mm
114-0204		  -25  BK7 pl/cx Ø50.8mm
110-0502
110-0505
110-0507
110-0509
110-0511
+75
+100
+150
+200
+250
50
75
125
175
225
3
4
6
8
10
BK7 pl/cv Ø25.4mm
112-0209		 -50
BK7 pl/cx Ø50.8mm
110-0502
110-0505
110-0507
110-0509
110-0511
+75
+100
+150
+200
+250
25
50
100
150
200
1.5
2
3
4
5
Note that distance between lenses d is the distance between focal planes of the lenses and is given theoretically (the thickness of lenses is not included into calculation). It, also, depends on wavelength. The distance should be adjusted ±10 mm in each particular case.

FS Simple Telescope Kit
Code Material Coating Item price, USD In stock Add to cart
140-3008 FS uncoated 1624.- Request Add to cart
143-3008 FS 355 nm, R<0.25% 2051.- Request Add to cart
141-3008 FS 532 nm + 1064 nm, R<0.5% 2079.- Request Add to cart
145-3008 FS 350-900 nm, R<1.5% 2359.- Request Add to cart
148-3008 FS 650-950 nm, R<1% 2303.- Request Add to cart
Other antireflection coatings are available on request.

Each kit includes 8 lenses (3 pcs. of lens 1 and 5 pcs. of lens 2), Aluminium Optical Rail 810-0005-02, two Aluminium Rail Carriers 810-0007-06, Self- Centering Lens Mounts 830-0010 and 830-0020, two Rod Holders 820-0050-02 and two Standard Rods 820-0010-02.

List of lenses in the Kit
Lens 1 Focal
length f1, mm		 Lens 2 Focal length
f2, mm		 Distance between
lenses d=F1+F2, mm		 Magnification, M
BK7
 FS bi/cv Ø12.7mm
114-3104		  -12.7 FS pl/cx Ø50.8mm
110-3505
110-3509
110-3511
110-3515
110-3517
+75
+100
+150
+200
+250
62
87
137
187
237
5.9
7.7
11.8
15.7
19.7
 FS bi/cv Ø25.4mm
114-3204		  -25 FS pl/cx Ø50.8mm
110-3505
110-3509
110-3511
110-3515
110-3517
+75
+100
+150
+200
+250
50
75
125
175
225
3
4
6
8
10
 
FS pl/cv Ø25.4mm
112-3205		  -50 FS pl/cx Ø50.8mm
110-3505
110-3509
110-3511
110-3515
110-3517
+75
+100
+150
+200
+250
25
50
100
150
200
1.5
2
3
4
5
Note that distance between lenses d is the distance between focal planes of the lenses and is given theoretically (the thickness of lenses is not included into calculation). It, also, depends on wavelength. The distance should be adjusted ±10 mm in each particular case.

UVFS Simple Telescope Kit
Code Material Coating Item price, USD In stock Add to cart
140-1008 UVFS uncoated 1638.- Request Add to cart
144-1008 UVFS 266 nm, R<0.4% 2058.- Request Add to cart
149-1008 UVFS 266 nm + 355 nm, R<0.6% 2072.- Request Add to cart
146-1008 UVFS 210-400 nm, R<1.5% 2352.- Request Add to cart
Other antireflection coatings are available on request.

List of lenses in the Kit

Each kit includes: 8 lenses (3 pcs. of lens 1 and 5 pcs. of lens 2), Aluminium Optical Rail 810-0005-02, two Aluminium Rail Carriers 810-0007-06, Self- Centering Lens Mounts 830-0010 and 830-0020, two Rod Holders 820-0050-02 and two Starndard Rods 820-0010-02.
Lens 1 Focal
length f1, mm		 Lens 2 Focal length
f2, mm		 Distance between
lenses d=F1+F2, mm		 Magnification, M
BK7
UVFS bi/cv Ø12.7mm
114-1104		  -12.7 UVFS pl/cx Ø50.8mm
110-1505
110-1509
110-1511
110-1515
110-1517

+75
+100
+150
+200
+250

62
87
137
187
237

5.9
7.7
11.8
15.7
19.7
UVFS bi/cv Ø25.4mm
114-1204		  -25 UVFS pl/cx Ø50.8mm
110-1505
110-1509
110-1511
110-1515
110-1517

+75
+100
+150
+200
+250

50
75
125
175
225

3
4
6
8
10
UVFS pl/cv Ø25.4mm
112-1205		 -50
 UVFS pl/cx Ø50.8mm
110-1505
110-1509
110-1511
110-1515
110-1517
+75
+100
+150
+200
+250
25
50
100
150
200
1.5
2
3
4
5

Note that distance between lenses d is the distance between focal planes of the lenses and is given theoretically (the thickness of lenses is not included into calculation). It, also, depends on wavelength. The distance should be adjusted ±10 mm in each particular case.

Net weight: 1.4 kg
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