From: Kurt Friedrich (kurt_friedrich_at_antispamdomain.not)
Date: Wed Nov 26 2003 - 00:51:01 EST
Great advice.
I have not updated to the new firmware, and it works
fine for me.
thanks
--- Pertti <pertti_.at._astro.tiranna.org> wrote:
> [You may put this into the Canon FAQ, too.]
>
> While studying Canon 10D modes for photography at
> the company
> Christmas party, I found out something that can be
> applied to
> astrophotography, too.
>
> A typical situation with an attached AF lens is that
> it is extremely hard
> to focus manually, but usually you can find at least
> one far-away
> object that is bright enough for autofocus (a street
> lamp, Moon, Mars
> or for some lenses even Vega works).
>
> My typical process has been:
> - aim the camera at the object,
> - AF by pressing the shutter half way,
> - switch the lens focus to manual,
> - point the camera to the real subject,
> - and be careful not to move the focus, which is
> very difficult sometimes
> with the 50 mm f1.8 lens as the focus ring is very
> loose in manual
> focus position.
>
> However, now I have found a better way of doing
> this:
> - change the custom function C.Fn-04 to 1: AE
> lock/AF,
> - set the lens to AF and let it stay there,
> - aim the camera at the bright object and press * to
> AF,
> - point the camera to the real subject,
> - and take as many images as you want to - pressing
> the shutter does not
> change the focus, and it stays put (especially if
> there is no full-time
> manual focus in your lens).
>
> NOTE: There was a bug fix in firmware 2.0.0
> regarding this functionality.
> I remember not having been able to make it work
> earlier, so you
> will most probably need that upgrade.
>
> Pertti
>
>
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