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sx40HS focus to infinity not doing it.

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Re: sx40HS focus to infinity not doing it.
« Reply #10 on: 21 / April / 2012, 12:33:46 »
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and Keep in mind ...

I do NOT use Digital zoom.

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Offline blackhole

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Re: sx40HS focus to infinity not doing it.
« Reply #11 on: 21 / April / 2012, 14:14:47 »
Focus on the Moon is good, much bigger problem is chromatic aberration which is consequence of poor quality lenses.
Make more pictures of the Moon, or even better make a movie and used Registax for the stack, the result will not fail.

http://www.astronomie.be/registax/

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Offline philmoz

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Re: sx40HS focus to infinity not doing it.
« Reply #12 on: 21 / April / 2012, 18:22:27 »
you said "perhaps infinity focus is too far out "
 i say its Not far enough..
I went and did some star shots and thay were Not in focus as i could Not get enough focus
and if i step it BACK by one it even gets worse.


The focus on the moon image looks similar to mine; but I'm seeing a lot of JPEG artifacts and some very strange colors. Doesn't look like CA to me except along the edge.

This is a handheld moon shot from mine at 1/100 sec, ISO 100 processed from a DNG file saved with CHDK.


I haven't tried any star shots so I can't compare them; but they don't look as good as you would expect.
What was your shutter speed on the star shots?

Phil.

« Last Edit: 21 / April / 2012, 18:29:17 by philmoz »
CHDK ports:
  sx30is (1.00c, 1.00h, 1.00l, 1.00n & 1.00p)
  g12 (1.00c, 1.00e, 1.00f & 1.00g)
  sx130is (1.01d & 1.01f)
  ixus310hs (1.00a & 1.01a)
  sx40hs (1.00d, 1.00g & 1.00i)
  g1x (1.00e, 1.00f & 1.00g)
  g5x (1.00c, 1.01a, 1.01b)

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Offline blackhole

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Re: sx40HS focus to infinity not doing it.
« Reply #13 on: 22 / April / 2012, 02:28:55 »
Your Moon looks great, I'm surprised there are so many differences if it comes to the same camera model, and if he did not use any process to get rid of noise, which may cause artifacts.
As for the stars they can never be completely sharp, because the motion of the atmosphere, visibility or seeing is a big problem for astrophotography.


Re: sx40HS focus to infinity not doing it.
« Reply #14 on: 22 / April / 2012, 06:53:24 »
BUT my PowerShot 300hs can take sharp star images.............

Re: sx40HS focus to infinity not doing it.
« Reply #15 on: 22 / April / 2012, 07:02:51 »
and here is 2 images UNEDITED....

 8)






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Offline blackhole

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Re: sx40HS focus to infinity not doing it.
« Reply #16 on: 22 / April / 2012, 11:03:07 »
I do not see any significant difference in sharpness.
Use Registax and you get something like this.

Re: sx40HS focus to infinity not doing it.
« Reply #17 on: 22 / April / 2012, 11:53:21 »
i Know how thay would look ...
But you need some detail to work with and BACK to the point of this post

This camera dont focus far enough .
as i said i looks like it needs  2 or 3 more steps on the focus. as i can watch the image get cleaner and sharper with the last 3 steps to the top "infinity" but then i can go no farther.
 


Re: sx40HS focus to infinity not doing it.
« Reply #18 on: 22 / April / 2012, 12:15:36 »
OK here is the proof that something is going on with how CHDK is focusing on this camera.

I used >manual focus< upto its max to get the clearest image as i could.
AND i used 2 Different SDHC cards one WITH CHDK and One WITHOUT CHDK for this test.

you can see clearly there is a isue with the Focus here
 And the image quality is worse to .....


No CHDK used for this image.

Model = Canon PowerShot SX40 HS
Orientation = top/left
Date Time = 2012-04-21 23:57:56

[Camera]
Exposure Time = 1/200"
F Number = F5.8
ISO Speed Ratings = 160
Exif Version = 30, 32, 33, 30
Date Time Original = 2012-04-21 23:57:56
Date Time Digitized = 2012-04-21 23:57:56
Shutter Speed Value = 7.66 TV
Aperture Value = 5.06 AV
Exposure Bias Value = ±0EV
Max Aperture Value = F5.78
Metering Mode = Pattern
Flash = Flash did not fire, compulsory flash mode
Focal Length = 150.5mm
Maker Note = 3786 Byte
User Comment =
Flashpix Version = Version 1.0
Color Space = sRGB
Exif Image Width = 4000
Exif Image Height = 2248
Sensing Method = One-chip color area sensor
File Source = DSC
Custom Rendered = Normal process
Exposure Mode = Auto exposure
White Balance = Auto white balance
Digital Zoom Ratio = 1x
Scene Capture Type = Normal




and for this image i used CHDK for this image.

Model = Canon PowerShot SX40 HS
Orientation = top/left
Date Time = 2012-04-21 23:56:42

[Camera]
Exposure Time = 1/200"
F Number = F5.8
ISO Speed Ratings = 160
Exif Version = 30, 32, 33, 30
Date Time Original = 2012-04-21 23:56:42
Date Time Digitized = 2012-04-21 23:56:42
Shutter Speed Value = 7.66 TV
Aperture Value = 5.06 AV
Exposure Bias Value = ±0EV
Max Aperture Value = F5.78
Metering Mode = Pattern
Flash = Flash did not fire, compulsory flash mode
Focal Length = 150.5mm
Maker Note = 3786 Byte
User Comment =
Flashpix Version = Version 1.0
Color Space = sRGB
Exif Image Width = 4000
Exif Image Height = 2248
Sensing Method = One-chip color area sensor
File Source = DSC
Custom Rendered = Normal process
Exposure Mode = Auto exposure
White Balance = Auto white balance
Digital Zoom Ratio = 1x
Scene Capture Type = Normal

« Last Edit: 22 / April / 2012, 12:35:06 by radioman193 »

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Offline Pier

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Re: sx40HS focus to infinity not doing it.
« Reply #19 on: 22 / April / 2012, 13:13:18 »
Hmmm, I've made some tests in beginning of March with SX130IS -Mode M, with and without MF.
And also with and without CHDK. Not only infinity but and on close ( 1-3 meter) distances.
Definitely the Focus was little bit worse with CHDK - like on pictures above.
All overrides when CHDK was used, were Unchecked = NO Overrides !
What going on I don't know ?

 

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