HD coating does make a difference...
Posted 30/11/2013 - 22:40
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The Photozone review reported that the FA77 suffered from purple fringing at wide apertures.
http://www.photozone.de/reviews/128-pentax-smc-fa-77mm-f18-limited-review--test-...
John K
http://www.photozone.de/reviews/128-pentax-smc-fa-77mm-f18-limited-review--test-...
John K
John K
Posted 30/11/2013 - 22:49
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77 tested at 2.5 not 1.8... My experience with that aperture 2.5 was ok...
Posted 01/12/2013 - 01:15
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That test is entirely meaningless. The two lenses have different characteristics, and different optical formulas. You can't expect the results to be identical.
To show the difference caused by the coating, if any, you'd need two identical lenses, one with the HD coating, and one with the regular coating.
To show the difference caused by the coating, if any, you'd need two identical lenses, one with the HD coating, and one with the regular coating.
Yves (another one of those crazy Canucks)
Posted 01/12/2013 - 03:46
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pentaxian450 wrote:
That test is entirely meaningless. The two lenses have different characteristics, and different optical formulas. You can't expect the results to be identical.
To show the difference caused by the coating, if any, you'd need two identical lenses, one with the HD coating, and one with the regular coating.
Yes agreed.That test is entirely meaningless. The two lenses have different characteristics, and different optical formulas. You can't expect the results to be identical.
To show the difference caused by the coating, if any, you'd need two identical lenses, one with the HD coating, and one with the regular coating.
Further those CA/Fringings can easily be removed in Processing these days.
[i]Bodies: 1x K-5IIs, 2x K-5, Sony TX-5, Nokia 808
Lenses: Pentax DA 10-17mm ED(IF) Fish Eye, Pentax DA 14mm f/2.8, Sigma 17-70mm f/2.8, Pentax-A 28mm f/2.8, Sigma 30mm F1.4 EX DC, Pentax-A 50mm f/1.2, Pentax-A 50mm f/1.4, Pentax-FA 50mm f/1.4, Pentax-A 50mm f/1.7, Pentax DA* 50-135mm f/2.8, Sigma 135-400mm APO DG, and more ..
Flash: AF-540FGZ, Vivitar 283
Lenses: Pentax DA 10-17mm ED(IF) Fish Eye, Pentax DA 14mm f/2.8, Sigma 17-70mm f/2.8, Pentax-A 28mm f/2.8, Sigma 30mm F1.4 EX DC, Pentax-A 50mm f/1.2, Pentax-A 50mm f/1.4, Pentax-FA 50mm f/1.4, Pentax-A 50mm f/1.7, Pentax DA* 50-135mm f/2.8, Sigma 135-400mm APO DG, and more ..
Flash: AF-540FGZ, Vivitar 283
Posted 01/12/2013 - 05:42
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pentaxian450 wrote:
That test is entirely meaningless. The two lenses have different characteristics, and different optical formulas. You can't expect the results to be identical.
To show the difference caused by the coating, if any, you'd need two identical lenses, one with the HD coating, and one with the regular coating.
+1That test is entirely meaningless. The two lenses have different characteristics, and different optical formulas. You can't expect the results to be identical.
To show the difference caused by the coating, if any, you'd need two identical lenses, one with the HD coating, and one with the regular coating.
Purple fringing aside, the 77mm Ltd is a portrait lens, designed to produce soft focus at wide apertures. In this case it's a feature, not a failing.
Peter E Smith - flickr Photostream
Posted 01/12/2013 - 09:14
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If I had smc da70/2.4, I surely would use it as comparison.plus, as I said, that was not serious comparison!
If you only see the difference on fringings and CA, that is fine. For me, I agree. meaningless comparison led to meaningless replies
If you only see the difference on fringings and CA, that is fine. For me, I agree. meaningless comparison led to meaningless replies
Posted 01/12/2013 - 11:09
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As I can see it, both lenses still have the purple fringing.
So you need to get rid of it with software on both lenses.
Finally, the results will be identical.
Regards, Horst
So you need to get rid of it with software on both lenses.
Finally, the results will be identical.
Regards, Horst
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467 posts
16 years
As far as I can see, HD did make a difference in good way. As you can see, 77mm gave much harsher purple fringing around the bulbs, and the whole image showed less contrast and noticeably soft at focus area. (see zoomed set 2)
Please judge them by yourselves.
Set1 (1/100s ISO 200)
FA77 (at f2.5)
HD70 (at f2.4)
Set2 (1/100s ISO 100)
FA77 (at f2.5)
HD70 (at f2.4)
Zoomed Set2 (focus area)
FA77 (at f2.5)
HD70 (at f2.4)