depth of field preview option

G

Guest

I have a minolta dynax 5 and I am having a problem understanding the depth of field preview option as well as locating infinity on this camera. I have read the manual but it is pretty breif in its description.

Can someone please tell me where infinity is on the camera and explain how the depth of field preview works (i.e, how do I know what is sharp and what isn't)?
 

cmanu

New Member
AS far as I know (i just starting in photography and just bought a D5) the DOF can be checked (or seen into the viewer) whn you set a small aperture. If you press the DOF button settin a small aperture, you will see (into the viewer) that everyting is comming dark because the DOF button just close the diaphragm to the aperture you just set. If you set a large aperture, the diaphragme will not be so closed and the image into the viewer will remain with (almost) the same light.
An other point is if I am not wrong, that using a small aperture will give you a sharpnest image for all the field in oposite to a large aperture which will give you a sharp image of your subject only.
Hope this can help you (sorry for my english)
 

peterblaise

Well-Known Member
> Ahmet Gokalp Ergec (Darksun) Posted on Thursday, October 23, 2003 - 12:10 pm:

> Hi, Wider aperture means more light and more light means less DOF. please refer to the web sites below
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Regards GOkalp

-----------------------------------

Peter Blaise responds:

Nice links - there's so much info ion the web, eh?

Actually more or less light ain't the issue.

It's the angle of light striking the film that matters.

The closer to the center of the lens (small f/stop aperture) the straighter the light path, and the smaller the conical circle of focus error (know as circle of confusion).

More or less light is a byproduct of a larger ot smaller aperture

Don't misunderstand that is is only a byproduct.

For instance, in one situation, I could use f/1.2 in dim light and get LESS light than f/22 in bright light in another situation.

Click!

Love and hugs,

Peter Blaise Monahon

Minolta Vivitar Tamron Fujifilm Ilford Kodak Adobe Hewlett Packard et cetera Photographer

peterblaise@yahoo.com

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U

Uksnapper

The closer to the center of the lens (small f/stop aperture) the straighter the light path, and the smaller the conical circle of focus error (know as circle of confusion). ~~~~~~~~~~~~~~~~~~~~~~~~~~~ Slight error Peter in your presentation ? The light from the edge of the subject( Indeed,any part of the subject ) arrives at the film plane in exactly the same angle of incidence regardless of aperture. regards Michael
 
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