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Old November 20th 05, 01:00 AM
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From: jimnjen not home NOSPAM yahoo
Subject: D70s - low light problem
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"Buy_Sell" wrote:
Jim, are we reading the same article?
http://www.cambridgeincolour.com/tut...ensor-size.htm

Under the topic, "Depth of Field Requirements", does it not say the
following:

As sensor size increases, the depth of field will decrease for a given
aperture (when filling the frame with a subject of the same size and
distance). This is because larger sensors require one to get closer to
their subject, or to use a longer focal length in order to fill the
frame with that subject. This means that one has to use progressively
smaller aperture sizes in order to maintain the same depth of field on
larger sensors.


It does say that. But the depth of field issue is caused by reducing
the lens to subject distance or increasing the focal length. If I had a
camera where I could actually change the sensor and mounted a lens X set
at aperture Y with a large sensor, then kept everything constant and
then swaped the large for a small sensor, the depth of filed would be
identical. However,if I wanted to create the identical image, I would need
to further from the subject to get the same field of view with the
smaller sensor. It is the fact that have I changed the lens to subject
distance that has changed the depth of field and not the sensor size.



- my Sony Mavica cameras work fine under low lighting conditions with
moving subjects.
- my Nikon D70s has difficulty producing the same results.

1. A vibration reduction lens will not solve this problem because the
subjects are moving, not me.

2. Closing down the aperture on a larger sensor camera means that I
must compensate in order to properly expose the sensor. Shutter speed
cannot be altered because of the moving subjects in low light.
Therefore, the ISO must be increased which results in a noisy image.

3. I am using a Nikkor 50mm f/1.8 lens, while the Sony Mavica is using
f/2.0

The way that I see it, the sensor size does affect the depth of field.




--
Jim

 




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