Purple Fringing: Lens Characteristic?


GSiGuy

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Sep 14, 2010
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#1
Hi, here's a shot i took from a recently acquired Takumar 135mm f2.5 and it seems from a crop there seems to be some purple fringing off the harsh reflection off the white helmet...





i was wondering if this is just a characteristic of the lens or is there an exposure or camera issue?

Also if you note the "pixellation" in the red grid plastic "fencing" right of the worker... is this normal on a crop?
 

Moonlightsg

Senior Member
Jan 28, 2010
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#2
i have this for my DA*16-50 too... i have filter on it... not sure is like that or the filter....
 

GSiGuy

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#3
i have this for my DA*16-50 too... i have filter on it... not sure is like that or the filter....
yes maybe will try shooting with the skylight filter on... but is it possible some lenses more prone to this than others?
 

angkukueh

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Oct 19, 2010
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#4
What aperture did you shoot at?
Maybe can try stopping down abit to see if PF still occurs
 

GSiGuy

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#5
What aperture did you shoot at?
Maybe can try stopping down abit to see if PF still occurs
either 4 or 3.5 i think. can't check cos its a manual lens but remember using less than wide open...
 

Gengh

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#6
i have this for my DA*16-50 too... i have filter on it... not sure is like that or the filter....
Just at the edges of the frame, or even in the middle like the example here? My 16-50 doesn't have any issue in the centre of the frame, though the lateral chromatic aberration is fairly strong at the edges. If you're getting bad purple fringing in the centre of the frame with the 16-50, I'm going to guess that the filter is at fault...
 

Gengh

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#7
Hi, here's a shot i took from a recently acquired Takumar 135mm f2.5 and it seems from a crop there seems to be some purple fringing off the harsh reflection off the white helmet...


i was wondering if this is just a characteristic of the lens or is there an exposure or camera issue?

Also if you note the "pixellation" in the red grid plastic "fencing" right of the worker... is this normal on a crop?
The purple fringing is most probably due to the lens. Stopping down as suggested will probably help.

The pixellation is jpg compression artifacts, can also see the effect along the back of the helmet, and along the back of the man's shirt. If you're shooting in jpg, you can save in a higher jpg quality to avoid this.
 

pentax

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#8
One option is to shoot in RAW, then do some PP to remove CA if you want.

Just FYI. I use RAW with DA 16-45mm frequently now,
then apply auto lens profile (with CA removal enabled only)
when importing RAW files to Lightroom.
It helps a lot to overcome CA for this lens.
(Another option is to shoot jpeg with auto CA removal option enabled in the camera for DA lens).

For older lens, sometimes I do manual CA removal in Lightroom when desired.
 

jie88

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Apr 24, 2010
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#9
Takumar 135mm f2.5 is a very old lens , film days lens , so probably CA control is not a priority .
 

GSiGuy

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Sep 14, 2010
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#10
The purple fringing is most probably due to the lens. Stopping down as suggested will probably help.

The pixellation is jpg compression artifacts, can also see the effect along the back of the helmet, and along the back of the man's shirt. If you're shooting in jpg, you can save in a higher jpg quality to avoid this.
yes i think i will stop down and try around f8 to f11.

i was shooting in the highest jpg quality... so dunno if that's an issue. Was set to Bright mode with fine sharpness adjustment up 2 notches or so...
 

GSiGuy

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Sep 14, 2010
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#11
Takumar 135mm f2.5 is a very old lens , film days lens , so probably CA control is not a priority .
yes i can live with that if that is the case... just not sure if its a lens characteristic or some other issue that is causing it...
 

angkukueh

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Oct 19, 2010
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#12
dont think there are any lenses that are pf/ca-free hehe.
even fa limiteds are prone to pf wide open.
 

GSiGuy

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Sep 14, 2010
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#13
dont think there are any lenses that are pf/ca-free hehe.
even fa limiteds are prone to pf wide open.
i suppose you are right.. am not expecting full pf/ca-free pictures especially in such an old lens but i just thought that this looked kinda odd...

on a different note, am going to post comparison pictures taken between a modern DA and the takumar lens shortly... interesting to see that they render so differently.
 

Moonlightsg

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Jan 28, 2010
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#14
Just at the edges of the frame, or even in the middle like the example here? My 16-50 doesn't have any issue in the centre of the frame, though the lateral chromatic aberration is fairly strong at the edges. If you're getting bad purple fringing in the centre of the frame with the 16-50, I'm going to guess that the filter is at fault...
I also cannot remember... if not pixle peek, will hardly notice... so i don't border to ask here when i see it...:bsmilie: filter is hoya HMC...
 

edutilos-

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Dec 28, 2010
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#15
You can easily remove that fringing thing mar... I mean, it's not fun to do, but it's not like you take a lot of photos where it shows up very prominently right? PF is not a real concern for me. :)
 

Gengh

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May 6, 2007
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#16
You can easily remove that fringing thing mar... I mean, it's not fun to do, but it's not like you take a lot of photos where it shows up very prominently right? PF is not a real concern for me. :)
Yup, Lightroom automatic lens profile is a life saver where this is concerned. :)

But that only removes lateral CA, don't think it can help TS in this case, I believe the purple fringing here has different origins.
 

Gengh

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#17
yes i think i will stop down and try around f8 to f11.

i was shooting in the highest jpg quality... so dunno if that's an issue. Was set to Bright mode with fine sharpness adjustment up 2 notches or so...
Highest jpg means the least compression, so that cannot be the issue. Maybe it's the sharpness adjustment, but I think you'll have to trial and error till you find the culprit...
 

GSiGuy

Senior Member
Sep 14, 2010
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#18
Highest jpg means the least compression, so that cannot be the issue. Maybe it's the sharpness adjustment, but I think you'll have to trial and error till you find the culprit...
you reckon it might not be the lens itself? in any case i will try various adjustments and see how. thanks for the suggestion.
 

Gengh

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#19
you reckon it might not be the lens itself? in any case i will try various adjustments and see how. thanks for the suggestion.
I was referring to the pixellation, I don't see how the lens could contribute to that. The purple fringing on the other hand, is probably due to the lens.
 

GSiGuy

Senior Member
Sep 14, 2010
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#20
I was referring to the pixellation, I don't see how the lens could contribute to that. The purple fringing on the other hand, is probably due to the lens.
thanks for clarifying. ok will try to it again as i think i can catch the pixellated portion on a bright day quite easily again.
 

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