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02-14-2015, 12:32 PM   #16
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Rob, you might have a bad copy of the 55mm DFA. If you are seeing green fringing (of a mid spectrum color) in a focal length that short, that is quite unusual.
An alternative might be the f/2.8 75mm AL for the Pentax 67.

02-14-2015, 01:16 PM   #17
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QuoteOriginally posted by desertscape Quote
Rob, you might have a bad copy of the 55mm DFA. If you are seeing green fringing (of a mid spectrum color) in a focal length that short, that is quite unusual.
An alternative might be the f/2.8 75mm AL for the Pentax 67.
I'm seeing it in my version as well as the one Pentax sent me while mine is being sent back to them.

Thanks
Rob
02-17-2015, 03:25 AM   #18
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QuoteOriginally posted by formercanuck Quote
The interesting part, is that there's a photographer who put out a post on the 645z and 55mm lens

55mm D-FA (Fast and silent, no CA anywhere)
When he said "CA" he meant the fringing you get around high-contrast edges, and not the magenta/green discoloration you get on objects in front of or behind the plane of focus, which is called LoCA, which all of the Pentax lenses I've used seem to suffer from.

Compared to the 85LII, which has stayed glued to my 5D2 for almost 6 years, the 150mm is absolutely free of aberrations and heck of a lot sharper to boot. The 85L fringed so hard, I could see it from the thumbnail previews, but it had no CA either, just purple fringing and LoCA out the wazoo.
02-17-2015, 11:22 AM   #19
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QuoteOriginally posted by Kolor-Pikker Quote
When he said "CA" he meant the fringing you get around high-contrast edges, and not the magenta/green discoloration you get on objects in front of or behind the plane of focus, which is called LoCA, which all of the Pentax lenses I've used seem to suffer from.

Compared to the 85LII, which has stayed glued to my 5D2 for almost 6 years, the 150mm is absolutely free of aberrations and heck of a lot sharper to boot. The 85L fringed so hard, I could see it from the thumbnail previews, but it had no CA either, just purple fringing and LoCA out the wazoo.
Yes, that's what I implied.

The 55mm is excellent albeit a little 'electric' in the look it gives. A lot of the lenses have some sort of fringing if you blow the highlights but the D-FA models seem relatively free of it. As does the 75mm, 120mm and 300mm (Which is superb). I've tried to loan some of the lenses I don't have to test out but so far I've not heard back from the rep at Pentax.

I understand why Rob wants to shoot wide open. It's what I would do a lot of the time too.

---------- Post added 02-17-15 at 06:23 PM ----------

If it helps Rob, pay the postage and I'll send you my one to try out and compare.

02-17-2015, 01:43 PM   #20
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QuoteOriginally posted by Kolor-Pikker Quote
and not the magenta/green discoloration you get on objects in front of or behind the plane of focus, which is called LoCA,
FYI, Longitudinal chromatic will cause fringing of in-focus objects at the focal plane of uncorrected colors and also with out of focus objects as well. Lateral chromatic is a variation of image size by color, thereby exhibiting fringing from either end of the spectrum. Commonly an in-focus object will show one end of the spectrum on one side and the opposite end of the spectrum on the other.
02-17-2015, 01:49 PM   #21
BTH
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I just picked up a D FA 55mm. I'll attach some test shots once I get a chance to use it.
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