Eksma optics 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.

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. 

 

BK7

Code

Coating

Material

Price

140-008

uncoated

BK7

€ 771

141-008

1064 nm, R<0.2%

BK7

€ 1075

142-008

532 nm + 1064 nm, R<0.5%

BK7

€ 1110

147-008

400-700 nm, R<0.9%

BK7

€ 1260

 

UVFS

Code

Coating

Material

Price

140-1008

Uncoated

UVFS

€ 1170

141-1008

532 nm + 1064 nm, R<0.5%

UVFS

€ 1485

143-1008

355 nm, R<0.25%

UVFS

€ 1465

144-1008

266 nm, R<0.4%

UVFS

€ 1470

145-1008

350-900nm, R<1.5%

UVFS

€ 1685

146-1008

210-400 nm,R<1.5%

UVFS

€ 1680

148-1008

650-950 nm, R<1%

UVFS

€ 1645

149-1008

266 nm + 355 nm, R<0.6%

UVFS

€ 1480



For more information, please see the 
DATASHEET
For any price request, we invite you to contact us : info@techlasershop.com 
or +32 4 365 02 43.

 

The Techlasershop team. 

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