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02-28-2011, 02:39 AM   #61
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QuoteOriginally posted by Class A Quote
PF is Bokeh CA.


That's just where it becomes so visible.


I sometimes don't translate "PF" to "Purple Fringing" but to "Pentax Fringing".

Here's another PF image from the FA 77/1.8...
Yes, that's typical of my FA77. However, the FA77 was used beyond the scope of its intended use. It can be used as a walkaround lens, but it's optimized for portrait distances. This "bokeh CA" is unwanted in the example you linked to, but the other side of the coin is that the lens has a creamy bokeh in other situations. Again: it's just what you prefer. The FA77 is a specialized lens and should be used accordingly.

02-28-2011, 04:32 AM   #62
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QuoteOriginally posted by Asahiflex Quote
The FA77 is a specialized lens and should be used accordingly.
I understand. I wasn't trying to diss the FA 77. I'd snap one in a heartbeat if I came across a bargain opportunity.

I was just trying to put the "pretty bad" comment regarding "CAs" into perspective. Apparently the Sigma 85/1.4 has negligible lateral chromatic aberration. Bokeh CA is not CA and cannot be avoided. One can try to minimise it but never completely get rid of it.

Whether or not the Sigma 85/1.4 designers left some issues undercorrected in order to achieve nice FA 77-like bokeh, as Jun Hirakawa apparently did, I don't know but it so far I cannot say that the Sigma 85/1.4 disappointed in any way (there are not so great sample pics around, but one cannot fault the lens for that).

Last edited by Class A; 03-30-2011 at 07:19 AM.
02-28-2011, 05:02 AM   #63
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Just came across this Sigma 85/1.4 shot on Flickr. Questions?
N.B., would it be OK to inline the photo here?

Or have a look at the smoothness of the bokeh circles in this night shot. Just a hint of brighter rim. I'm impressed.
02-28-2011, 11:14 AM   #64
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QuoteOriginally posted by Asahiflex Quote
Yes, that's typical of my FA77. However, the FA77 was used beyond the scope of its intended use. It can be used as a walkaround lens, but it's optimized for portrait distances. This "bokeh CA" is unwanted in the example you linked to, but the other side of the coin is that the lens has a creamy bokeh in other situations. Again: it's just what you prefer. The FA77 is a specialized lens and should be used accordingly.
I think it would be uncommon for fast 85's not to display such thing. also the desired effect one lens try to achieve. the A* 85 for example has to sacrifice PF in exchange for sharpness. the Sigma I would think has to sacrifica LoCa for balanced sharpness and OOF blur quality.

02-28-2011, 12:07 PM   #65
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QuoteOriginally posted by nater Quote
Not sure if folks noticed, but there's a review of the Canon/Nikon mount version of the Sigma 85mm on lenstip.com:

Sigma 85 mm f/1.4 EX DG HSM review - Introduction - Lenstip.com
Tx--all things considered, Sigma 85 looking special--well worth the $$. I may just get me one.
02-28-2011, 01:22 PM   #66
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just receive an email from B&H. Sigma 85 is now in stock for the K-mount. the problem is, I'm also contemplating on getting the x100 next month.
02-28-2011, 01:56 PM   #67
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QuoteOriginally posted by Pentaxor Quote
just receive an email from B&H. Sigma 85 is now in stock for the K-mount. the problem is, I'm also contemplating on getting the x100 next month.
Oh, so now you're backing out
02-28-2011, 02:21 PM   #68
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QuoteOriginally posted by Asahiflex Quote
Oh, so now you're backing out
Not Really. I just don't have mad money for both right now. Wife quit her job, Baby on the way. I can't even afford a damn replacement flash right now. and it sucks. it's like the first half of 2009 all over again.

02-28-2011, 02:23 PM   #69
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QuoteOriginally posted by Pentaxor Quote
Not Really. I just don't have mad money for both right now. Wife quit her job, Baby on the way. I can't even afford a damn replacement flash right now. and it sucks. it's like the first half of 2009 all over again.
At least you got your priorities right! BTW, I once was in the same position, but time flies. And remember, it's only a lens
02-28-2011, 02:31 PM   #70
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QuoteOriginally posted by Asahiflex Quote
At least you got your priorities right! BTW, I once was in the same position, but time flies. And remember, it's only a lens
true. I can always get it in the future.
02-28-2011, 04:55 PM   #71
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Personaly I find the FOV of the 85 too narrow for a "protrait" lens. I had the FA77 and found that too narrow ...think if I wanted a dedicated portrait lens I would go for the DA* 55. There was a reason the 85s were popular as portrait lenses with 135 film ...but that FOV is now coverd with the 55mm lens. I found that 135 or so a bit long for portraits when using 135 film and couldn't get in close enough.
02-28-2011, 09:26 PM   #72
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QuoteOriginally posted by Pentaxor Quote
true. I can always get it in the future.
But than who is going to test it, give us good samples, and induce LBA?
02-28-2011, 10:04 PM   #73
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QuoteOriginally posted by yeatzee Quote
But than who is going to test it, give us good samples, and induce LBA?
if you can give me some money, I would be happy to test it for you.
02-28-2011, 10:47 PM   #74
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QuoteOriginally posted by Class A Quote
PF is Bokeh CA.
I don't think so. PF is more than just the purplish fringing component of bokeh fringing that occurs in front of the focal plane. If you get it all around the focal plane, it no longer has anything to do with bokeh fringing. Bokeh fringing is purple in front and green behind the focal plane. PF can appear behind the focal plane as well; it doesn't discriminate

Here's an example:

02-28-2011, 11:39 PM   #75
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QuoteQuote:
Pentaxor: true. I can always get it in the future.
Yes, & its likely to be less expensive then too--like Asahiflex says, way to balance the priorities.

I almost purchased 1 tonight, but am struggling with several options:

1) buy K5
2) buy 70-200 Tammy
3) buy Siggy 85
4) buy 50-135

I truly am torn, and am still researching other systems too. Money is way too hard to get to jump on a purchase--at least for me.

QuoteQuote:
MikePerham Personaly I find the FOV of the 85 too narrow for a "protrait" lens.
This can often be true, but more often, for me, 85 is great for portraits, in or outdoors.
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