Hi Brian,
Actually, if you get your eye just right, you can see both sides. -
especially from a tripod.
Tom
On 12 Dec 99, at 23:14, Brian P. Huber spoke about
*RE: [OM] Is the 2-4 screen the righ,* saying
> Per,
> If you use the extreme example (a 1-3 screen) you can more easily see what
> happens. Use a long lens and stop it down if it isn't at 5.6 or smaller
> aperture. You'll see that a good picture of the image will be able to be
> seen in 1/2 of the split prism.
> Again, it is not great, but the difference between that image and the one on
> the ground glass is usually sufficient to determine focus. I repeat, this
> is not something I would try to do on a regular basis, but focus can be
> determined this way.
>
> Brian P. Huber
> Troy, OH
> bphuber@xxxxxxxxxx
> Brian P. Huber wrote:
> > When using the 1-13, or the 1-3, try using just 1/2 of the split image.
> > Sometimes it can give a clear image of the object you are trying to focus.
> > If that's all you've got, it can be rather satisfactory.
> Per replied:
> I'm not sure exactly what you mean here Brian. I used these before and not
> found them very suitable with my Sigma 600/8. How can one focus with only
> 1/2 of the split image? Isn't both halves needed so that focus can be
> obtained by aligning them?
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