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12-27-2013, 06:49 AM   #1
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K 50mm f1.2 CA and fringing...

Hi Guys,

I bumped into a this legendary lens and its has alot of fringing and CA. Is this normal? It did not come with the hood and test shot without the hood. Would this have caused such problems?
Anyone who has this lens has experience in using it and knows its temperament??? I am really considering to get this lens...
please help... thnaks

David

12-27-2013, 07:23 AM   #2
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12-27-2013, 08:54 AM   #3
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Wide open, you may run into some CA or "bokeh fringing." Stopped down the 50/1.2 becomes pretty resistant to CA. I've yet to run across any at f8, for example.
12-27-2013, 09:41 AM   #4
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QuoteOriginally posted by choong_dc Quote
Hi Guys,

I bumped into a this legendary lens and its has alot of fringing and CA. Is this normal? It did not come with the hood and test shot without the hood. Would this have caused such problems?
Anyone who has this lens has experience in using it and knows its temperament??? I am really considering to get this lens...
please help... thnaks

David
Tell us about the shooting conditions as well.

12-27-2013, 09:41 AM   #5
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QuoteOriginally posted by northcoastgreg Quote
Wide open, you may run into some CA or "bokeh fringing." Stopped down the 50/1.2 becomes pretty resistant to CA. I've yet to run across any at f8, for example.
We don't get these lenses to run them at f8.
12-27-2013, 10:29 AM   #6
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QuoteOriginally posted by Blue Quote
We don't get these lenses to run them at f8.
Unless we need the extra light for focusing with tired old eyes
12-27-2013, 10:30 AM   #7
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QuoteOriginally posted by Blue Quote
We don't get these lenses to run them at f8.
Amen!

Phil.
12-27-2013, 10:53 AM   #8
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QuoteOriginally posted by Blue Quote
We don't get these lenses to run them at f8.
Last I checked, the 50 f1.2 does have an aperture ring. You can occasionally visit other apertures just for the fun of it, or perhaps when wider depth of field is needed. No law against that. f1.2 has it's uses, but so does f8.

12-27-2013, 05:19 PM   #9
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QuoteOriginally posted by northcoastgreg Quote
Last I checked, the 50 f1.2 does have an aperture ring. You can occasionally visit other apertures just for the fun of it, or perhaps when wider depth of field is needed. No law against that. f1.2 has it's uses, but so does f8.
That wasn't the point.
12-27-2013, 06:47 PM   #10
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You're missing out. Sure f/1.2 is fun at f/1.2, but an f/1.2 will also be about the sharpest lens you can find when stopped down -- so not just a one-trick pony, even if it is a good trick. Heck, they are liable to be sharper at f/2 than any other 50/55 you might you use...
12-27-2013, 10:32 PM   #11
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QuoteOriginally posted by vonBaloney Quote
You're missing out. Sure f/1.2 is fun at f/1.2, but an f/1.2 will also be about the sharpest lens you can find when stopped down -- so not just a one-trick pony, even if it is a good trick. Heck, they are liable to be sharper at f/2 than any other 50/55 you might you use...
I didn't say it was. However, this is a thread discussing CA when it is used wide open. Therefore, stopping it down to f8 doesn't make a lot of sense given the price difference in it and a SMC 50/1.4. That is why I asked him about the shooting conditions.
12-27-2013, 10:44 PM   #12
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The OP didn't say anything about wide open, and it is perfectly valid to point out that it is still a worthwhile lens when on something other than f/1.2.
12-27-2013, 11:04 PM   #13
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QuoteOriginally posted by vonBaloney Quote
The OP didn't say anything about wide open, and it is perfectly valid to point out that it is still a worthwhile lens when on something other than f/1.2.
Again, that is why I asked the OP about. shooting conditions. My original response regarding f1.2 was to northcoastgreg. If I didn't think it was a worthwhile lens, I wouldn't have an A50/1.2

Last edited by Blue; 12-27-2013 at 11:09 PM.
12-28-2013, 02:03 AM   #14
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Whooooaaaa.... ok ok... sorry for late repy.

It was shot during late afternoon near evening... say the sun is at my front at 30 degree up from the ground.
I was asking if it was shot without the hood would have caused the CA and fringing. And if putting up a hood would actually reduced it or eliminate it.
Now I am using an APSC camera body coupled with this sweet baby [50mm f1,2]. I understand that the hood was originally for 35mm film cameras. When couples with a dslr at 1.5x magnification APSC, the hood can be extended as it utilizes the centre of the lens only [which is also the highest MTF i assume]...

Guys, help me out if application of the hood will eliminate the CA and fringing [purple]. Anyone who owns this baby please do try it out and let me know... I am like so wantthis lens badly... but if its a bad copy no point having it... [crying bucket loads]...

THanks
12-28-2013, 02:39 AM - 1 Like   #15
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PF is normal to a certain degree especially with such fast lenses.
A hood doesn't help.
A strong UV filter does help a bit. With the UV filter you can of course only reduce the UV light. You cannot reduce purple fringing that originates from the addition of visible red+blue light.
I think you just have to live with it. Adjustment in post-processing is the most effective way to reduce it.
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