Yes, the sun and moon are the same apparent size as
viewed from earth, but your formula for the image size
in a 35mm camera is high by about a factor of 2. The
correct formula for the image size in mm is the focal
length in mm divided by 109.
Image Size of Sun (mm) = focal length (mm) / 109
A 400 mm flocal length has an image size of 3.7 mm and
a field of view of 3.4 deg x 5.1 deg.
See the web site referenced in my previous post.
--- frieder.faig@xxxxxxxxxxxxxxxxxxxxxxxxx wrote:
> On Thu, Jul 12, 2001 at 05:01:59PM -0500, gries
> wrote:
> > How large was the sun in the viewfinder?
> >
>
>
> Rule over the thump:
> a) Sun and moon aper in the same visible size. (this
> is why moon an solar eclipe work).
>
> b) With a 50 mm lens (shot taken on earth) both
> have 1mm size in the negative.
> 400mm is 8x magnification, so they are have 8 mm
> size, wich is 1/3 of the picture
> height of OM cameras.
>
> Frieder Faig
>
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