A550 Porting... - page 9 - General Discussion and Assistance - CHDK Forum
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A550 Porting...

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Offline GrAnd

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Re: A550 Porting...
« Reply #80 on: 18 / March / 2008, 05:25:25 »
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Quote from: muttley on 15 / March / 2008, 23:37:04
but i don't know because this features was disabled  :blink:

are you sure av ovveriding working good before?!

Does A550 have iris diaphragm?
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Offline muttley

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Re: A550 Porting...
« Reply #81 on: 18 / March / 2008, 06:13:00 »
Quote from: GrAnd on 18 / March / 2008, 05:25:25
Does A550 have iris diaphragm?

this is a good question!!   :)

I don't know where can i get characteristic and features (to insert in include/camera.h) of Canon PowerShoot a550...and I use the same features of a560 so equal to A550  :blink:

n.b. I'm an happy geek, not a photographer  :P
« Last Edit: 18 / March / 2008, 06:20:40 by muttley »
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Offline synthesilica

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Re: A550 Porting...
« Reply #82 on: 18 / March / 2008, 06:21:47 »
The Aperture override seemed to work. The pictures did get darker when the number was increased. I'll test the old build if it actually affects the depth of field or if it really is just an ND filter.
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Offline GrAnd

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Re: A550 Porting...
« Reply #83 on: 18 / March / 2008, 06:40:52 »
Quote from: muttley on 18 / March / 2008, 06:13:00
Quote from: GrAnd on 18 / March / 2008, 05:25:25
Does A550 have iris diaphragm?

this is a good question!!   :)

Usual, the diaphragm can be visible (especial in action) through lenses.
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Offline muttley

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Re: A550 Porting...
« Reply #84 on: 18 / March / 2008, 06:49:06 »
I hope a photographer more expert of me can verify THIS and OTHERS cam features (now i don't have cam with me).

so we can update include/camera.h!

thanks a lot GrAnd!

p.s. however if a560 don't have diaphragm i don't think a550 have it...it's younger sister (less expensive...and less features)
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Offline synthesilica

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Re: A550 Porting...
« Reply #85 on: 18 / March / 2008, 07:01:57 »
I just tested the old build. The aperture can only be set between 2.6 and 7.1. It seems like it really is just an ND filter. The DOF doesn't change at all either.



Here are the comparison shots. The first 5 values are rounded down to 2.6 while all the others are brought to 7.1. What's strange though is that the first 2 shots (2.61 and 2.82), the EXIF says 2.6 which is correct but for the other shots, it says 7.1 which is wrong for the last 3 brighter shots (3.17, 3.56, and 4.00) which are clearly supposed to be 2.6.
« Last Edit: 18 / March / 2008, 08:54:31 by GrAnd »
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Offline muttley

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Re: A550 Porting...
« Reply #86 on: 18 / March / 2008, 07:29:21 »
good work!! your test is very clear!

so the a550 don't have diaphragm...

well, the last release in trunk it's correct!

For EXIF porblem i don't know, but if you have a time test ND filter with latest release and verify EXIF and AV...

thanks!

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Offline synthesilica

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Re: A550 Porting...
« Reply #87 on: 18 / March / 2008, 07:48:59 »
Just tested the latest build.

ND filter Off, Out, In, respectively


It's just like the one above but the EXIF says all were exposed at f2.6. It's as if the aperture doesn't change at all, it's just an ND filter. The only way for the aperture to change is by zooming in.
« Last Edit: 18 / March / 2008, 08:53:54 by GrAnd »
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Offline muttley

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Re: A550 Porting...
« Reply #88 on: 18 / March / 2008, 08:27:04 »
it seem me ok  :blink:

mhhh...but...from off to out are there differences?  ???

btw, thanks again!

p.s. you are a good photographer not me  :o ...ehm..read this Would you help  :P
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Offline ynaig

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Re: A550 Porting...
« Reply #89 on: 18 / March / 2008, 20:27:14 »
a550

property 23
f2.6 -> 277
f3.2 -> 308
f3.5 -> 336
f4.0 -> 388
f5.0 -> 439
f5.5 -> 480

Ynaig
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