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 is 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

 

The distance from the second lens to the focal point of the combined lenses is called the back focal length (BFL). If the separation distance is equal to the sum of the focal lengths (d = f1 + f2), the combined focal length and BFL are infinite.

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  

 

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.

Delivery

Estimated delivery time: Request

Coating
Material

BK7

UVFS

Code Material Coating Price Delivery Add to cart
140-1008 UVFS uncoated 1287 $ Request To cart
141-1008 UVFS 532 nm + 1064 nm, R<0.5% 1634 $ Request To cart
143-1008 UVFS 355 nm, R<0.25% 1612 $ Request To cart
144-1008 UVFS 266 nm, R<0.4% 1617 $ Request To cart
145-1008 UVFS 350-900 nm, R<1.5% 1854 $ Request To cart
146-1008 UVFS 210-400 nm, R<1.5% 1848 $ Request To cart
148-1008 UVFS 650-950 nm, R<1% 1810 $ Request To cart
149-1008 UVFS 266 nm + 355 nm, R<0.6% 1628 $ Request To cart

Any other antireflection coating wavelength region is available on request.

Delicious

BK7

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.

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. 

 

UVFS

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
 
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.

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