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12-05-2008, 06:46 PM   #1
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50mm f/1.4 FA - chromatic aberration / green fringe

On my FA 50mm f/1.4 I noticed that I get green fringe sometimes. I'm curious is this is normal for this lens, or if I should be concerned, and return it to the place of purchase.

Ex. 1: f/2 1/100 0ev ISO800




Ex. 2: f/2 1/90 0ev ISO200




I have other samples, but these show the green fringe the best.
Best


Last edited by kveldalf; 12-06-2008 at 04:39 PM.
12-05-2008, 07:43 PM   #2
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Funny, I have been carrying on about this problem for what, 2 years now. Suddenly, everyone notices it, weird.

Anyway, no i tis not unusual, the lens is known to do this. See my review on this site and in my sig.
12-06-2008, 06:22 AM   #3
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Chromatic aberration is, to some extend, normal for any lens. Especially lenses with circular surfaces, like most fifties... Closing down the aperture a bit will help, and most editing programs can take care of it too.

for the record, I wouldn't call this a "problem", since it's a physical phenomenon. Using aspherical surfaces goes a long way in solving this "problem".

Remembe that fast fifties are stil among the best lenses out there
12-06-2008, 06:27 AM   #4
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Purple Fringeing is normal for this lens. This is the signature of Fa 50mm f1.4 optical property. Still, this lens is a bargain and one can choose to live with it.

12-06-2008, 09:33 AM   #5
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It's cyan not purple and it manages to attach itself to small areas of contrast and sneaks it's way through the whole image, particularly within OOF areas.
12-06-2008, 02:02 PM   #6
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QuoteOriginally posted by Alfisti Quote
It's cyan not purple and it manages to attach itself to small areas of contrast and sneaks it's way through the whole image, particularly within OOF areas.
A little colour blind for me last night ...

The fringeing like a graduated band of cyan or purple from high contrasty edge especially in the OOF areas is just too common with this Fa 50 as well as Fa 77 ltd. Though Fa 77 is doing a lot less than Fa 50 f1.4
12-06-2008, 02:05 PM   #7
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QuoteOriginally posted by Alfisti Quote
It's cyan not purple and it manages to attach itself to small areas of contrast and sneaks it's way through the whole image, particularly within OOF areas.
It also manages to attach itself with greater frequency to pixel peepers, and with far less frequency to photographers.
12-06-2008, 04:11 PM   #8
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QuoteOriginally posted by Wheatfield Quote
It also manages to attach itself with greater frequency to pixel peepers, and with far less frequency to photographers.
Word.


Most, if not all, wide-aperture lenses have this behavior at wide apertures. Some are better than others, but I don't think it's an image-breaker in normal photography.

12-06-2008, 04:21 PM   #9
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Unforunately photographers would have noticed this type of CA too.
12-06-2008, 06:07 PM   #10
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QuoteOriginally posted by Alfisti Quote
It's cyan not purple and it manages to attach itself to small areas of contrast and sneaks it's way through the whole image, particularly within OOF areas.
Actually I noticed a LOT of purple firnging too with this lens, probably the most of any lens I have ever used... Across Pentax, Olympus and Nikon...

QuoteOriginally posted by Wheatfield Quote
It also manages to attach itself with greater frequency to pixel peepers, and with far less frequency to photographers.
Actually I first noticed this in 5x7" prints, no need to pixel peep...
12-06-2008, 06:16 PM   #11
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QuoteOriginally posted by roentarre Quote
Unforunately photographers would have noticed this type of CA too.
hee hee ... I am going to sa that first shot in this post was a nice DOF shot.
And being lunch time at work ... I am hungry as well.
12-07-2008, 12:44 AM   #12
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Original Poster
In response to the pixel peeping, to my shock and horror, I just discovered that the new sensor that Pentax just put in has a burnt / hot pixel. They had the camera for four weeks, and now I'm faced with whether or not I need to send it back to have the sensor replaced again.

Last edited by kveldalf; 12-07-2008 at 01:00 AM.
12-07-2008, 08:14 AM   #13
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QuoteOriginally posted by Wheatfield Quote
It also manages to attach itself with greater frequency to pixel peepers, and with far less frequency to photographers.

What a dickhead comment.

Look at this from the 77/1.8, and i have removed most of the fringing. it's attached to all the frames of the cars parked to the left.


12-07-2008, 01:03 PM   #14
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QuoteOriginally posted by Wheatfield Quote
It also manages to attach itself with greater frequency to pixel peepers, and with far less frequency to photographers.
Strangely, it also goes away completely when shooting film...

Steve
06-06-2009, 04:26 AM   #15
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a lot of chromatic aberration, normal ?

hi all,
I just got the 50mm f1.4 fa lens (mostly for portrait/low light), but it being my newest and super-fastest lens, I thought I'd test it today on some sports.


(100% crop, f1.4 1/4000s, iso200)
On this picture I get what seems to me like A LOT of chromatic aberration/ purple fringing at f1.4 around the white kimono. It remains quite annoying at f1.7, and become tolerable at f2.0

I'm not overly worried about this, but still, I'd rather to be sure this amount of fringing is normal. I've already had to send the lens back once because it had a large dark speck inside...

thanks
Jean-Christophe
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