Re: [APML] Determining camera FOV on starchart??

[Emmanuele Sordini <vega@ulisse.it>]

Hi Gerry,
I'm forwarding you the response I from Glenn Ray to a two-year old message 
of mine with very much the same question. It worked fine for me, hope this 
is what you were looking for, or at least is of some help as to your problem.

Cheers,
Emmanuele Sordini

At 17.34 31/08/2000 -0400, you wrote:
>Hi Emmanuele,
>
>This may be an indirect way of making your calculation, but I would go to
>the Digital Sky Survey website and try to recreate the field of view of some
>of the objects you described.
>
>The url is http://stdatu.stsci.edu/cgi-bin/dss_form.  You can enter the
>object name/I.D. (ex. "M45" for the Pleaides) or coordinates.
>Select "First Generation Survey" and a maximum Height and Width 60
>arcminutes each (which should be enough to cover the field of vision for an
>8" SCT @ f/10).  Finally choose GIF file format and click the RETRIEVE IMAGE
>button.
>
>The resulting image will be large (if 60' x 60', the image size will be
>2119x2119 pixels), but you can then copy and reduce the file size if you
>want.  Since this corresponds to a resolution of about 1.7 arcseconds per
>pixel, you should have enough resolution to determine your field of view.
>
>Hope that works.  I'd be curious to hear your estimated results.
>
>Glenn Ray
>Cypress, TX
>http://www.geocities.com/glennlray/Astro/


At 17.44 02/09/2002 -0400, you wrote:
>Hello group, cloudy on the east coast, praying for clear skies for the 
>Black Forest Star party this week!
>I'm trying to make a clear overlay for my  uranometria starcharts that 
>would be the approximate FOV that my 35mm camera sees when using a 
>10"  SCT/F10 (2500mm FL) running prime focus.
>I understand 35mm film is 24mm X 36mm. The FOV of the scope at F10 is 33 
>arc min x 49.5 arc min.
>How do I translate this to the starchart for an overlay?
>
>Then what would the camera FOV be at F6.5 using a focal reducer?
>
>Thank you, in advance, Gerry


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