What does the focus = 1m refer to?
Is it not that the zs is a fixed value based on the mechanical structure of the lense?
CeHao1
I think the focus means, when zs = zi, and z0 = focus. Is that true?
Rui-Wang-813
Having attended the second lecture, I think @CeHao is correct.
SmurphySean
How exactly did we get the value of zs? We use the thin lens equation, but zs is not part of that equation. In particular, where did 1/50 come from?
greeknerd1
Do foreground values tend to be a lot smaller than background values and focus values?
ML2000-LT
I wonder how exacly is A related to the information given here?
seenumadhavan
@SmurphySean, zs can be calculated with the equation 1/f = 1/(distance from lens to sensor) + 1/(distance from lens to focal plane). In this case f is 50mm, the distance from the lens to the sensor is zs, and the point the sensor focuses on is given as 1 meter, or 1000mm. Rearranging our equation, we get 1/zs = 1/50 - 1/1000 and taking 1/ both sides leaves us with the expression shown in the slides.
What does the focus = 1m refer to? Is it not that the zs is a fixed value based on the mechanical structure of the lense?
I think the focus means, when zs = zi, and z0 = focus. Is that true?
Having attended the second lecture, I think @CeHao is correct.
How exactly did we get the value of zs? We use the thin lens equation, but zs is not part of that equation. In particular, where did 1/50 come from?
Do foreground values tend to be a lot smaller than background values and focus values?
I wonder how exacly is A related to the information given here?
@SmurphySean, zs can be calculated with the equation 1/f = 1/(distance from lens to sensor) + 1/(distance from lens to focal plane). In this case f is 50mm, the distance from the lens to the sensor is zs, and the point the sensor focuses on is given as 1 meter, or 1000mm. Rearranging our equation, we get 1/zs = 1/50 - 1/1000 and taking 1/ both sides leaves us with the expression shown in the slides.