Is it at all possible to manually control aperture on canon ixus 850 IS? - General Discussion and Assistance - CHDK Forum
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Is it at all possible to manually control aperture on canon ixus 850 IS?

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Offline vangoss

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Is it at all possible to manually control aperture on canon ixus 850 IS?
« on: 04 / April / 2008, 15:32:31 »
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Hello!

Is it at all possible to manually control aperture on canon ixus 850 IS?

I really want to be able to take a picture of a object, say a meter away, whilst the surrounding being out of focus.
my little camera can't do that at the moment, once it focus on objects around 30cm away everything else , even meters away is also in focus.

I do hope its possible, i have a feeling this is a physical limitation of my camera however.

thankyou for any assistance

from Joe
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Offline image13

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Re: Is it at all possible to manually control aperture on canon ixus 850 IS?
« Reply #1 on: 05 / April / 2008, 04:46:35 »
hi,

i think there are two things here:

* most probably the ixus 850 has only one aperture
   at all like most other ixuses and uses an nd-filter
   to simulate another one (but because it is at the
   same aperture there is no influence on dof - depth
   of field) - so there is nothing to set anyway :)

* the sensor chips in p&s digitcams are so small,
   that you will get real dof only in macro situations,
   for everything else you will need something with
   a bigger sensor (like a dslr) or go back to film -
   both combined with a fast prime lens or for smaller
   targets a medium fast tele should give you what
   you are looking for

* you may try to fake dof in photoshop using the
   lens blur filter with a layer mask which is based
   on the distance to the objects - there are some
   tutorials about this on the net like here

      http://photography-on-the.net/forum/showthread.php?t=102294

good luck and best wishes - image13
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