Thanks Harry!
That's why I made just an other test with an image of ratio 36 / 24 =
1.5 and giving f = 35 and crop = 1 I obtained hfov = 54.43, which is
the same number I was expecting and that I computed in a previous
post. But I did not consider the ratio, which in my example is not
equivalent to that of a 35 mm film. Thanks again.
On Apr 13, 12:27 pm, Harry van der Wolf <hvdw...@gmail.com> wrote:
> 2009/4/13 alf <liquidt...@gmail.com>
>
>
>
> > Thanks for trying to help, but as I wrote:
>
> > 1) I just passed the data
>
> > 2272 x 1704 size
> > 35 mm focal
> > 1 crop factor
>
> This is enough data to calculate the FOV for an unmodified(!) image from a
> camera. The FOV is determined by the lense. The HFOV and VFOV can be
> calculated by the dimensions (aspect ratio) of your image, e.g. 4:3
> (2272:1704).
> If you have a 35mm lense (or equivalent), you can use it with a 1Mp, 5Mp or
> 12Mp camera. Pixels or resolution will not change your FOV, which is
> determined by your lense.
> HFOV and VFOV will be determined by the "aspect ratio" of your image, based
> on the format of a 36x24 mm: how is the image projected on the CCD, what is
> the aspect ratio, width and height, of the CCD (related to this 36x24 mm).
> If you change the "aspect ration" of how your images are captured, which
> might be a functionality of your camera, than the HFOV and FVOV will change.
> If you change the dimensions of your image to be captured to 4:3
> (2272x1704), or 3:2 (resulting in "old" analog format of 15x10 photo's) or
> 16:9 ("widescreen"), the FOV will still be the same, but the HFOV and VFOV
> will change.
>
> Coming back to the crop factor: As you already did see, the calculations are
> based on the "old" analog standard 36x24 mm. However, CCD's of digital
> consumer camera's (and I don't mean the expensive full-size SLR camera's)
> all have smaller CCD's.
> If you look into the specifications of your digital camera you might see
> that your CCD is for example 1/2.33" (almost always in inches).
> From this size you can calculate the crop-factor. Take a look at
> <http://en.wikipedia.org/wiki/Crop_factor#Crop_factor_of_point-and-sho...>.
> I think there will be page in your language as well about it.
>
> Hoi,
> Harry
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