- #1

Aymangh994

- 15

- 2

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- Thread starter Aymangh994
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- #1

Aymangh994

- 15

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- #2

sophiecentaur

Science Advisor

Gold Member

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Edit: PS I think you are assuming the 'telescope formula' applies but your object distance is not infinite and are you looking at an image or projecting it onto a sensor?

- #3

Aymangh994

- 15

- 2

Combination 1 : f1= 320mm f2=40mm the total f= 35.5mm and M= 8

Combination 2 : f1= 800mm and f2=100mm the total focal length is f=88.89 mm and M= 8

and how to calculate the working distance ?

- #4

Aymangh994

- 15

- 2

Sketch

following questions :

1. should I use the lensmaker's equation to calculate the working distance ? which focal length should I insert in the equation? the total f or f1 ?

2. The distance between the two lenses and the distance between the CCD-Sensor and the last lens ?

following questions :

1. should I use the lensmaker's equation to calculate the working distance ? which focal length should I insert in the equation? the total f or f1 ?

2. The distance between the two lenses and the distance between the CCD-Sensor and the last lens ?

- #5

tech99

Science Advisor

Gold Member

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