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Re: Just posted! Sony SLT-A33 Sample Gallery

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C_C_G

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The Sony SLT-A55 and Sony SLT-A33 are the most interessting cameras in the last years for me.

However, I find the pictures of the Sony SLT-A33 not good.

For example, have a look at picture DSC00473: You can see clearly that a lot of objects have a green border/halo on the outside and a red border/halo on the inside (relative to the centre of the picture / lens).

I explain my findings here (please zoom in):





If you look well, this is visible on a lot of objects! Once seen, you suspect it on all objects on all pictures...

Now: Is this linked to the lens, i.e. a better lens will produce better pictures?

Pls comment on my findings.
Thank you!
 
I missed your explanation - did you accidentally leave it out ? Are you referring to chromatic aberration which can cause coloured fringes on image objects, particularly with hard contrast edges ?

This is usually caused by the lens & can be corrected in post processing.For a more detailed explanation see here :-

http://en.wikipedia.org/wiki/Chromatic_aberration

--
Keith-C
 
Definitely a lens problem. This is evidenced by it being a lot worse towards the corners of the frame, which is mentioned in the photozone review mentioned by the previous poster. Although 16-105mm is a very attractive focal range, it's very hard (i.e. expensive) to make a lens with a zoom ration of 6.5:1 abberration free at all focal lengths. If you want minimal chromatic abberation, stick with a prime, or a zoom with less range. Personally I stick with zoom lenses with a zoom ratio of not more than 3:1.
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zepzr said:
Photographers feel guilty that all they do for a living is press a button. - Andy Warhol
Click to expand...
 
It's the lens. Can't expect miracles from a €45 kitlens (that's the price for a new one here), but it's still one of the better kitlenses out there.
 
TrojMacReady said:
It's the lens. Can't expect miracles from a €45 kitlens (that's the price for a new one here), but it's still one of the better kitlenses out there.
Click to expand...
It's not the kit lens. It's the Sony DT 16-105 mm F 3.5-5.6 which sells for around £480 in the UK. A bit more than €45! I'd not be happy with that level of abberration even on a kit lens, let alone one selling at £480.

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TrojMacReady said:
Photographers feel guilty that all they do for a living is press a button. - Andy Warhol
Click to expand...
 
MisterBG said:
TrojMacReady said:
It's the lens. Can't expect miracles from a €45 kitlens (that's the price for a new one here), but it's still one of the better kitlenses out there.
Click to expand...
It's not the kit lens.
Click to expand...
You're right, my bad.
BG454 said:
It's the Sony DT 16-105 mm F 3.5-5.6 which sells for around £480 in the UK. A bit more than €45! I'd not be happy with that level of abberration even on a kit lens, let alone one selling at £480.
Click to expand...
The 16-105 gives a bit of CA at the extreme ends (in this case the wide end). Again, there's no free lunch. Its a very sharp lens for a midrange walkaround one. The CA wouldn't bother me at all (RAW, lens profile, problem solved).
 
Thanks for the answers!
TrojMacReady said:
TrojMacReady wrote:
The CA wouldn't bother me at all (RAW, lens profile, problem solved).
Click to expand...
Do I understand correctly that Software would be able to correct the CA issues, when shooting with RAW and knowing the lens profile? Which SW would be able to correct the CA (apart from Photoshop, which is too expensive for me)?
 
C_C_G said:
C_C_G said:
TrojMacReady wrote:
The CA wouldn't bother me at all (RAW, lens profile, problem solved).
Click to expand...
Do I understand correctly that Software would be able to correct the CA issues, when shooting with RAW and knowing the lens profile? Which SW would be able to correct the CA (apart from Photoshop, which is too expensive for me)?
Click to expand...
The two stand-alone programs that offer CA correction are PT Lens and DXO. PT Lens is the cheaper of the two but DXO offers more features. I've never used either so I cannot comment on their performance.
Links:
http://epaperpress.com/ptlens/
http://www.dxo.com/uk/photo/dxo_optics_pro/optics_geometry_corrections
--
C_C_G said:
Photographers feel guilty that all they do for a living is press a button. - Andy Warhol
Click to expand...
 
As I see it is the silly pixel race: The resolution of the sensors exaggerate the lens resolutions. They fit for super sharp prime lenses, but with normal ones like wlk around zooms they show lens errors. It would be better if industry would increase image quality instead of pixel count. For normal shooters 10 to 12 Mpixel should be sufficient for APS-C, and 20 to 24 Mpixel for FF. More is necessary for mediocre sales people and marketing experts. P&S seems to have stopped the pixel race. Would be good if system camera producers would do it too !
 
MisterBG said:
C_C_G said:
BG454 said:
TrojMacReady wrote:
The CA wouldn't bother me at all (RAW, lens profile, problem solved).
Click to expand...
Do I understand correctly that Software would be able to correct the CA issues, when shooting with RAW and knowing the lens profile? Which SW would be able to correct the CA (apart from Photoshop, which is too expensive for me)?
Click to expand...
The two stand-alone programs that offer CA correction are PT Lens and DXO. PT Lens is the cheaper of the two but DXO offers more features. I've never used either so I cannot comment on their performance.
Click to expand...
Lightroom and Capture One also have lens profiles but their collection is still far smaller (and their corrections are still considered to be a tad behind DxO).

For Nikon cameras, Capture NX has automatic CA correction without requiring any lens profiles (it still seems to be the only app that can do this) but otherwise the app is not the greatest in speed or user interface.

A number of other apps offer manual CA correction (ie, you have to move sliders and eye-ball things, but you often save settings with work with individual lenses). Aperture for example falls into this category.
 
noirdesir said:
For Nikon cameras, Capture NX has automatic CA correction without requiring any lens profiles (it still seems to be the only app that can do this) but otherwise the app is not the greatest in speed or user interface.

A number of other apps offer manual CA correction (ie, you have to move sliders and eye-ball things, but you often save settings with work with individual lenses). Aperture for example falls into this category.
Click to expand...
As a Canon user I'm also used to lens auto correction in DPP (using the lens EXIF information), but the OP was referring to problems with the Sony, so I didn't think a camera-specific suggestion for another brand would be very helpful.
--
noirdesir said:
Photographers feel guilty that all they do for a living is press a button. - Andy Warhol
Click to expand...
 
MisterBG said:
noirdesir said:
For Nikon cameras, Capture NX has automatic CA correction without requiring any lens profiles (it still seems to be the only app that can do this) but otherwise the app is not the greatest in speed or user interface.

A number of other apps offer manual CA correction (ie, you have to move sliders and eye-ball things, but you often save settings with work with individual lenses). Aperture for example falls into this category.
Click to expand...
As a Canon user I'm also used to lens auto correction in DPP (using the lens EXIF information), but the OP was referring to problems with the Sony, so I didn't think a camera-specific suggestion for another brand would be very helpful.
Click to expand...
I did not intend to suggest Capture NX, I just mentioned it to give perspective how different apps deal with this (database, smart algorithm, manual sliders), and unfortunately Capture NX is still the only app using a smart algorithm.
 
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