On Tue, May 29, 2001 at 12:51:17PM -0500, gries wrote:
> DOES ANYONE KNOW THE APPROXIMATE SIZE OF THE SPOT METER ON THE OM-4T W/ A
> 50MM LENS? (IN TERMS OF DEGREES, E.G. 4 DEGREES?)
>
Hi
I´ve been using the formula to calculate the angel of field of a lens for
the Spot angel problem.
alpha = 2*ATAN(D/(2*f))
I feed a spreadsheed with focal lenghts and D=5mm as diameter of the spot area.
This are The values `ve got are:
focal- 5mm-Spot
lenght angel
mm [°]
18 16
21 14
24 12
28 10
35 8.2
40 7.2
50 5.7
70 4.1
85 3.4
90 3.2
100 2.9
135 2.1
180 1.6
200 1.4
250 1.1
300 1.0
350 0.8
400 0.7
500 0.6
600 0.5
1000 0.3
Frieder Faig
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|