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Re: #2570 RE: [OM] 16/3.5 fisheye vs. 18/3.5 wide angle.

Subject: Re: #2570 RE: [OM] 16/3.5 fisheye vs. 18/3.5 wide angle.
From: "Paul D. Farrar" <farrar@xxxxxxxxxxxx>
Date: Mon, 23 Jul 2001 22:10:50 -0500
At 02:29 PM 7/23/01 EDT, you wrote:
>"gries" <gries@xxxxxxxxxxxxxxxxxxxxxxxxxxx> writes:
>
><<  I have almost considered
> giving up the fisheye because this lens *almost* has the same coverage
> as the 16 w/o the strange wrapping on the sides of the frame.  If you
> got money to spend on just one, then I think it should be the 18/3.5. >>
>
>On that subject, althought the 16mm has 180 degrees across the diagonal and 
>the 18mm has 100 degrees, how do the vertical and horizontal angles of view 
>compare?
>
>Gries is saying that they are quite similar.
>
>Does anyone have figures for V and H angles of view for these two?
>

The formula is 2 * arctan(f/L)

Where L is the radius of the frame.
Vertical L = 12mm
Horiz L = 18mm
Diag L = 22mm

18mm is easy for horiz: 90deg

Paul


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